More H.235 remarks

25 Jan 1998

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INTERNATIONAL TELECOMMUNICATION UNIONTELECOMMUNICATIONSTANDARDIZATION SECTOR
STUDY PERIOD 1997 -2000COM 16-        -E
September 1997
Original: English
Question 14/16
STUDY GROUP 16 - CONTRIBUTION
SOURCE* :	RAPPORTEUR FOR Q.14/16 (Gary THOM)
TITLE:		PROPOSED RECOMMENDATION H.235
__________
Summary
This contribution provides the text for draft Recommendation H.235 Security and encryption for H series (H.323 and other H.245 based) multimedia terminals which is an editorially refined version of the one determined at the SG16 meeting in March 1997.
This Recommendation describes enhancements within the framework of the ITU H.3(XX) specification series, to incorporate security services such as Authentication and Privacy (data encryption). The proposed scheme is applicable to both simple point-to-point and multi-point conferences for any terminals which utilize H.245 as a control protocol.
It is proposed that this draft be decided at the January-February 1998 meeting of SG16.
* Contact:	Jim Toga	Tel.: +1 (503) 264-8816
    Intel Corporation	Fax: +1 (503) 264-3485
    Santa Clara, USA	E-mail: jtoga@ibeam.intel.com

INTERNATIONAL  TELECOMMUNICATION  UNION
ITU-T	H.235
TELECOMMUNICATION	(January 1998)STANDARDIZATION  SECTOR	OF  ITU
LINE  TRANSMISSION  OF  NON-TELEPHONESIGNALS
Security and Encryption for H Series (H.323 and other H.245 based) multimedia terminals
DRAFT  ITU-T  Recommendation  H.235
FOREWORD
The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of the International Telecommunication Union.  The ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis.
The World Telecommunication Standardization Conference (WTSC), which meets every four years, established the topics for study by the ITU-T Study Groups which, in their turn, produce Recommendations on these topics.
ITU-T Recommendation H.235 was prepared by the ITU-T Study Group 16 (199x-199x) and was approved by the WTSC (Place, Month xx-xx, 199x).
___________________
ãð  ITU  199x
All rights reserved.  No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the ITU.
SUMMARY
This Recommendation describes enhancements within the framework of the ITU H.3(XX) specification series, to incorporate security services such as Authentication and Privacy (data encryption). The proposed scheme is applicable to both simple point-to-point and multi-point conferences for any terminals which utilize H.245 as a control protocol.
For example, H.323 systems operate over packet based networks which do not provide a guaranteed Quality of Service. For the same technical reasons that the base network does not provide QOS, the network does not provide a secure service. Secure real-time communication over insecure networks generally involves two major areas of concern  authentication and privacy.
This Recommendation describes the security infrastructure and specific privacy techniques to be employed by the H.3(XX) series of multimedia terminals. This document will cover areas of concern for interactive conferencing.  These areas include, but are not strictly limited to authentication, privacy of all real-time media streams that are exchanged in the conference.  This Recommendation provides the protocol and algorithms needed between the H.323 entities.
H.235 utilizes the general facilities supported in H.245 and as such, any standard which operates in conjunction with this control protocol may use this security framework. It is expected that wherever possible other H.series terminals may interoperate and directly utilize the methods described in this document. This document will not initially provide for complete implementation in all areas, and will specifically highlight endpoint authentication and media privacy.
This recommendation includes the ability to negotiate services and functionality in a generic manner, and to be selective concerning cryptographic techniques and capabilities utilized. The specific manner in which they are used,  relates to systems capabilities, application requirements and specific security policy constraints. This recommendation supports varied cryptographic algorithms, with varied options appropriate for different purposes; e.g. key lengths.  Certain cryptographic algorithms may be allocated to specific security services (e.g. one for fast media stream encryption and another for signalling encryption). 
It should also be noted that some of the available cryptographic algorithms or mechanisms may be reserved for export or other national issues (e.g. with restricted key lengths).  The recommendation supports signalling of well-known algorithms in addition to signalling non-standardized or proprietary cryptographic algorithms. There are no specifically mandated algorithms, however it is strongly suggested that endpoints support as many of the applicable algorithms as possible in order to achieve interoperability.  This parallels the concept that the support of H.245 does not guarantee the interoperability between two entities codecs.

 TOC  * MERGEFORMAT 1.	Scope	 PAGEREF _Toc410402794 \h 1
2.	Normative references	 PAGEREF _Toc410402795 \h 1
3.	Definitions	 PAGEREF _Toc410402796 \h 3
4.	Symbols and abbreviations	 PAGEREF _Toc410402797 \h 4
5.	Conventions	 PAGEREF _Toc410402798 \h 5
6.	System Introduction	 PAGEREF _Toc410402799 \h 6
6.1	Summary	 PAGEREF _Toc410402800 \h 6
6.2	Authentication	 PAGEREF _Toc410402801 \h 6
6.2.1	Certificates	 PAGEREF _Toc410402802 \h 6
6.3	Call Establishment Security	 PAGEREF _Toc410402803 \h 7
6.4	Call Control  (H.245) Security	 PAGEREF _Toc410402804 \h 7
6.5	Media Stream Privacy	 PAGEREF _Toc410402805 \h 7
6.6	Trusted Elements	 PAGEREF _Toc410402806 \h 8
6.6.1	Key Escrow	 PAGEREF _Toc410402807 \h 8
6.7	NonRepudiation	 PAGEREF _Toc410402808 \h 8
7.	Connection Establishment Procedures	 PAGEREF _Toc410402809 \h 9
7.1	 Introduction	 PAGEREF _Toc410402810 \h 9
8.	H245 Signalling AND PROCEDURES	 PAGEREF _Toc410402811 \h 9
8.1	Secure H.245 Channel Operation	 PAGEREF _Toc410402812 \h 9
8.2	Unsecured H.245 Channel Operation	 PAGEREF _Toc410402813 \h 10
8.3	Capability Exchange	 PAGEREF _Toc410402814 \h 10
8.4	Master role	 PAGEREF _Toc410402815 \h 10
8.5	Logical Channel Signalling	 PAGEREF _Toc410402816 \h 10
9.	Multipoint Procedures	 PAGEREF _Toc410402817 \h 11
9.1	Authentication	 PAGEREF _Toc410402818 \h 11
9.2	Privacy	 PAGEREF _Toc410402819 \h 11
10.	Authentication Signalling AND PROCEDURES	 PAGEREF _Toc410402820 \h 11
10.1	Introduction	 PAGEREF _Toc410402821 \h 11
10.2	Diffie-Hellman with optional Authentication	 PAGEREF _Toc410402822 \h 11
10.3	Subscription Based Authentication	 PAGEREF _Toc410402823 \h 12
10.3.1	Introduction	 PAGEREF _Toc410402824 \h 12
10.3.2	Password with symmetric encryption	 PAGEREF _Toc410402825 \h 12
10.3.3	Password with hashing	 PAGEREF _Toc410402826 \h 13
10.3.4	Certificate based with signatures	 PAGEREF _Toc410402827 \h 13
11.	Media Stream Encryption Procedures	 PAGEREF _Toc410402828 \h 14
11.1	Media Session Keys	 PAGEREF _Toc410402829 \h 14
12.	Security Error Recovery	 PAGEREF _Toc410402830 \h 15

1.	Scope
The  primary purpose of this Recommendation is to provide for authentication, privacy, and  integrity within the current H series protocol framework.  The current text of this document (1998) provides details on implementation with H.323.  This framework is expected to operate in conjunction with other H series protocols that utilize H.245 as their control protocol.
Additional goals in this recommendation include:
Security architecture should be developed as an extensible and flexible framework for implementing a security system for H series terminals. This should be provided through flexible and independent services and the functionality that they supply. This includes the ability to negotiate and be selective concerning cryptographic techniques utilized, and the manner in which they are used.
Provide security for all communications occurring as a result of H.3xx protocol usage.  This includes aspects of connection establishment, call control, and media exchange between all entities. This requirement includes the use of confidential communication (privacy), and may exploit functions for peer authentication as well as protection of the users environment from attacks.
This recommendation should not preclude integration of other security functions in H.3xx entities which may protect them against attacks from the network.
This recommendation should not limit the ability for any H.3xx series to scale as appropriate. This may include both the number of secured users and the levels of security provided. 
Where appropriate, all mechanisms and facilities should be provided independent of any underlying transport or topologies. Other means that are outside the scope of H.235 may be required to counter such threats.
Provisions are made for operation in a mixed environment (secured and unsecured entities)
This recommendation should provide facilities for distributing session keys associated with  the cryptography utilized. (This does not imply that public-key based certificate management must be part of H.235).
The security architecture, described in this Recommendation, does not assume that the  participants are familiar with each other. It does however assume that appropriate precautions have been taken to physically secure the H series endpoints. The principal security threat to communications, therefore, is assumed to be eavesdropping on the network or some other method of diverting media streams.
The 1996 H.323 standard provides the means to conduct an audio, video and data conference between two or more parties, but does not provide the mechanism to allow each participant to authenticate the identity of the other participants, nor provide the means to make the communications private. (i.e., encrypt the streams).
H.323, H.324, H.310, H.324M make use of the logical channel signalling procedures of Recommendation H.245, in which the content of each logical channel is described when the channel is opened.  Procedures are provided for expression of receiver and transmitter capabilities, transmissions are limited to what receivers can decode, and receivers may request a particular desired mode from transmitters.  The security capabilities of each endpoint are communicated in the same manner as any other communication capability.
Some H series (H.323) terminals may be used in multipoint configurations. The security mechanism described in this document will allow for secure operation in these environments including both centralized and decentralized MCU operation.
2.	Normative references
The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this Recommendation.  At the time of publication, the editions indicated were valid.  All Recommendations and other references are subject to revision;  all users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references listed below.  A list of the currently valid ITU-T Recommendations is regularly published.
[1]	ITU-T Recommendation H.323 (1998): Packet Based Multimedia Communications Systems
[2]	ITU-T Recommendation H.225.0 (1998): " Call Signaling Protocols and Media Stream Packetization for Packet Based Multimedia Communications Systems ".
[3]	ITU-T Recommendation H.245 (1998): "Control Protocol for Multimedia Communication ".
[4]	ITU-T Recommendation Q.931 (1993): "Digital Subscriber Signalling System No.  1 (DSS 1) - ISDN User-Network Interface Layer 3 Specification for Basic Call Control".
[5]	ITU-T Recommendation X.509: The directory-authentication framework
[6]	CCITT Recommendation X.800 (1991), Security Architecture for Open Systems Interconnection for CCITT applications.
(ISO 74982:1989, Information processing systems  Open Systems Interconnection  Basic Reference Model  Part 2: Security Architecture.)
[7]	ITU-T Recommendation X.803 (1994) | ISO/IEC 10745:1995, Information technology  Open Systems Interconnection  Upper layers security model.
[8]	ITU-T Recommendation X.810 (1995) | ISO/IEC 10181-1:1996, Information technology  Open Systems Interconnection  Security frameworks for open systems: Overview.
[9]	ITU-T Recommendation X.811 (1995) | ISO/IEC 10181-2:1996, Information technology  Open Systems Interconnection  Security frameworks for open systems: Authentication framework.
[10]	ISO/IEC 9798-2:1994, Information technology  Security techniques  Entity authentication.  Mechanisms using symmetric encipherment algorithms
[11]	ISO/IEC 9798-3:1993, Information technology  Security techniques  Entity authentication using public key algorithm.
[12]	ISO/IEC 9798-4:1995, Information technology  Security techniques  Entity authentication.  Mechanisms using a cryptographic check function
[13]	Internet Engineering Task Force, 1996 Security Architecture for the Internet Protocol, RFC 1825, RP. Atkinson
    Internet Engineering Task Force, 1997 Keyed-Hashing for Message Authentication, RFC 2104, H. Krawczyk, M. Bellare, and R. Canetti

3.	Definitions
For the purposes of this Recommendation the definitions given in section 3 of H.323, H.225.0, and H.245  apply along with those in this section. Some of the following terms are used as defined in CCITT Rec. X.800 | ISO 7498-2 and X.803, X.810 and X.811:
access control: The prevention of unauthorized use of a resource, including the prevention of use of a resource in an unauthorized manner (X.800).
authentication: The provision of assurance of the claimed identity of an entity (X.811).
authentication: The granting of permission on the basis of authenticated identification.
attack: The activities undertaken to bypass or exploit deficiencies in a systems security mechanisms. By a direct attack on a system they exploit deficiencies in the underlying algorithms, principles, or properties of a security mechanism. Indirect attacks are performed when they bypass the mechanism, or when they make the system use the mechanism incorrectly.
certificate: A set of security-relevant data issued by a security authority or trusted third party, together with security information which is used to provide the integrity and data origin authentication services for the data (X.810).  In this recommendation the  term refers to public key certificates which are values that represent an owners public key (and other optional information) as verified and signed by a trusted authority in an unforgeable format.
cCipher: A cryptographic algorithm, a mathematical transform.
confidentiality: The property that prevents disclosure of information to unauthorized individuals, entities, or processes.
cryptographic algorithm: Mathematical function that computes a result from one or several input values using a secret parameter (e.g. a key).
encipherment : Encipherment (encryption) is the process of making data unreadable to unauthorized entities by applying a cryptographic algorithm (an encryption algorithm). Decipherment (decryption) is the reverse operation by which the ciphertext is transformed to the plaintext.
integrity: The property that data has not been altered in an unauthorized manner.
key management: The generation, storage, distribution, deletion, archiving and application of keys in accordance with a security policy (X.800).
media stream: A media steam can be of type audio, video or data or a combination of any of them. Media stream data conveys user or application data (payload) but no control data.
Nnonrepudiation: Protection from denial by one of the entities involved in a communication of having participated in all or part of the communication 
Pprivacy:  A mode of communication in which only the explicitly enabled parties can interpret the communication.  This is typically achieved by encryption and shared key(s) for the cipher.
pPrivate channel:  For this document, a private channel is one that is a result of prior negotiation on a secure channel.  In this context it may be used to handle media streams.
pPublic kKey cCryptography: An encryption system utilizing asymmetric keys (for encryption/decryption) in which the keys have a mathematical relationship to each other - which cannot be reasonably calculated.
symmetric (secret-key based) cryptographic algorithm: An algorithm for performing encipherment or the corresponding algorithm for performing decipherment in which the same key is required for both encipherment and decipherment (X.810).
threat: A potential violation of security (X.800).
4.	Symbols and abbreviations
For the purposes of this Recommendation, the following symbols and abbreviations apply.
CBC:	Cipher Block Chaining
CFB:	Cipher Feedback
DSS:	Digital Signature Standard
ECB:	Electronic Code Book
IPSEC: 	Internet Protocol Security
ISAKMP: Internet Security Association and Key Management Protocol
OFB:	Output Feedback
QoOS:	Quality of  Service
RSA:	Rivest, Shamir and Adleman (public key algorithm)
SDU: 	Service Data Unit
TLS: 	Transport Level Security 

5.	Conventions
In this document the following conventions are used:
"Shall" indicates a mandatory requirement.
"Should" indicates a suggested but optional course of action.
"May" indicates an optional course of action rather than a recommendation that something take place.
References to Sections, Paragraphs, Annexes, and Appendices refer to those items within this Recommendation unless another document is explicitly listed.  For example, Section 1.4 refers to section 1.4 of this Recommendation; H.245 Section 6.4 refers to section 6.4 in H.245.
{ To be refined for this recommendation - This Recommendation describes the use of n different message types: H.245, RAS, Q.931, etc. To distinguish between the different message types the following convention is followed. H.245 message and parameter names consist of multiple concatenated words highlighted in bold typeface (maximumDelayJitter).  RAS message names are represented by three letter abbreviations (ARQ). Q.931 message names consist of one or two words with the first letters capitalized (Call Proceeding).}
6.	System Introduction
6.1	Summary
The Call Signalling channel may be secured using TLS [TLS] or IPSEC [13/IPSEC] on a secure well-known port (H.225.0). 
Users may be authenticated either during the initial call connection, in the process of securing the  H.245 channel and/or by exchanging certificates on the H.245 channel.
The encryption capabilities of a media channel are determined by extensions to the existing capability negotiation mechanism.
Initial Distribution of key material from the Master is via H.245 OpenLogicalChannel or OpenLogicalChannelAck messages.
Re-keying may be accomplished by H.245 commands; EncryptionUpdateRequest and EncryptionUpdate.
Key material distribution is protected either by operating the H.245 channel as a private channel or by specifically protecting the key material using the selected exchanged certificates.
The security protocols presented either conform to ISO published standards or IETF proposed standards.
6.2	Authentication
The process of authentication verifies that the respondents are, in fact, who they say they are. Authentication may be accomplished in conjunction with the exchange of  public key based Certificates.  Authentication may also be accomplished by an exchange which utilizes a shared secret between the entities involved.  This may be a static password or some other a priori piece of information
This Recommendation describes the protocol for exchanging the certificates, but does not specify the criteria by which they are mutually verified and accepted.  In general, certificates give some assurance to the verifier that the presenter of the certificate is who he says he is. The intent behind the certificate exchange is to authenticate the user of the endpoint, not simply the physical endpoint. Using Digital Certificates, an authentication protocol proves that the respondents possess the private keys corresponding to the public keys contained in the certificates. This authentication protects against man-in-the-middle attacks, but does not automatically prove who the respondents are. To do this normally requires that there be some policy regarding the other contents of the certificates. For authorization certificates, for example, the certificate would normally contain the Service-Providers identification along with some form of user account identification prescribed by the Service Provider.
The authentication framework in this document does not prescribe the contents of certificates (i.e., does not specify a certificate policy) beyond that required by the authentication protocol. However, an application using this framework may impose high-level policy requirements such as presenting the certificate to the user for approval.  This higher level policy may either be automated within the application or require human interaction.
For authentication which does not utilize digital certificates, this Recommendation provides the signalling to complete various challenge/response scenarios.  This method of authentication requires prior coordination by the communicating entities so that a shared secret may be obtained.  An example of this method would be a customer of a subscription based service.  
As a third option,  the authentication  may be completed within the context of a separate security protocol such as TLS [TLS] or IPSEC [13/IPSEC].
Both bi-directional and unidirectional authentication may be supported by peer entities.  This authentication may occur on some or all of the communication channels.  
All of the specific authentication mechanisms described in this recommendation are identical to, or derived from ISO developed algorithms as specified in references [10-12] or based on IETF protocols
6.2.1	Certificates
The standardization of certificates, including their generation, administration and distribution is outside the scope of this document.  The Certificates used to establish secure channels (call signalling and/or call control) shall conform to  those prescribed by whichever protocol has been negotiated to secure the channel. 
It should be noted that for authentication  utilizing public key certificates,  the endpoints are required to provide digital signatures using the associated private key value.  The exchange of public key certificates alone does not protect against man in the middle attacks.  The H.235 protocols conform to this requirement.
6.3	Call Establishment Security
There are at least two reasons to motivate securing the call establishment channel (e.g. H.323 using Q.931).  The first is for simple authentication, before accepting the call.  The second reason is to allow for call authorization.  If this functionality is desired in the H Series terminal, a secure mode of communication should be used (such as TLS/IPSEC for H.323) before the exchange of call connection messages. Alternatively, the authorization may be provided based upon a service specific authentication.  The constraints of  a service specific authorization policy are outside the scope of  this document.
6.4	Call Control  (H.245) Security
The call control channel (H.245) should also be secured in some manner to provide for subsequent media privacy.  The H.245 channel shall be secured using any negotiated privacy mechanism (this includes the option of none). H.245 messages are utilized to signal encryption algorithms and encryption keys used in the shared, private, media channels.   The ability to do this, on a logical channel by logical channel basis, allows different media channels to be encrypted by different mechanisms.  For example, in centralized multipoint conferences,  different keys may be used for streams to each endpoint.  This may allow media streams to be made private for each endpoint in the conference.  In order to utilize the H.245 messages in a secure manner  the entire H.245 channel (logical channel 0) should be opened in a negotiated secure manner. 
The mechanism by which H.245 is made secure is dependent on the H series terminals involved.  The only requirement on all systems that utilize this security structure is that each  shall have some manner in which to negotiate and/or signal that the H.245 channel is to be operated in a particular secured manner before it is actually initiated.    For example, H.323 will utilize the H.225.0 connection signalling messages to accomplish this.
6.5	Media Stream Privacy
This Recommendation describes media privacy for media streams carried on packet based  transports.  These channels may be uni-directional with respect to H.245 logical channel characterizations.  The channels are  not required to be uni-directional on a physical or transport level. 
A first step in attaining media privacy should be the provision of  a private control channel on which to establish cryptographic keying material and/or set up the logical channels which will carry the encrypted media streams.  For this purpose, when operating in a secure conference, any participating  endpoints may  utilize an encrypted H.245 channel. In this manner, cryptographic algorithm selection and encryption keys as passed in the H.245 OpenLogicalChannel command are protected. 
The H.245 secure channel may be operated with different characteristics than the private media channel(s) as long as it provides a mutually acceptable level of privacy.  This allows for the security mechanisms protecting media streams and any control channels to operate in a completely independent manner, providing completely different levels of strength and complexity.
If it is required that the H.245 channel be operated in a non-encrypted manner, the specific media encryption keys may be encrypted separately in the manner signaled and agreed to, by the participating parties. A logical channel of type h235Control may be utilized to provide the material to protect the media encryption keys. This logical channel may be operated in any appropriately negotiated mode.
The privacy (encryption) of  data carried in logical channels shall be in the form specified by the OpenLogicalChannel.  Transport specific header information shall not be encrypted.  The privacy of data is to be based upon end-to-end encryption.  
6.6	Trusted Elements
The basis for authentication (trust) and privacy is defined by the terminals of the communications channel.  For a connection establishment channel, this may be between the caller and a hosting network component.  For example, a telephone trusts that the network switch will connect it with the telephone whose number has been dialed. For this reason, any  entity which terminates an encrypted H.245 control channel  or any encryptedData type logical channels shall be considered a trusted element of the connection; this may include MC(U)s and Gateways.  The result of trusting an element is the confidence to reveal the privacy mechanism (algorithm and key) to that element.
Given the above, it is incumbent upon participants in the communications path to authenticate any and all trusted elements.  This will normally be done by certificate exchange as would occur for the standard end to end authentication.    This recommendation will not require any specific level of authentication, other than to suggest that it be acceptable to all entities using the trusted element. Details of a trust model and certificate policy are for further study.
Privacy can be assured between the two endpoints only if connections between trusted elements are proven to be protected against man in the middle attacks.  
6.6.1	Key Escrow
Although not specifically required for operation, this recommendation contains provision for entities utilizing the H.235 protocol to support a key escrow, or key recovery technique within the signalling elements.  
The ability to recover lost media encryption keys should be supported in installations where this functionality is desired or required.
6.7	NonRepudiation
FFS.

7.	Connection Establishment Procedures
7.1	 Introduction
As stated in the  REF _Ref379881422 * MERGEFORMAT 6.	System Introduction section, both the call connection channel (H.225.0 for H.323 series) and  call control (H.245) channel shall operate in the negotiated secured or unsecured mode starting with the first exchange.  For the call connection channel, this is done a priori (for H.323 a TLS secured TSAP [port 1300] shall be utilized for the Q.931 messages). For the call control channel, security  mode is determined by information  passed in the initial connection setup protocol in use by the H series terminal.
In the cases in which there are no overlapping  security capabilities, the called terminal may refuse the connection. The error returned should convey no information about any security mis-match the calling terminal will have to determine the problem by some other means.  In cases where the calling terminal receives a connect acknowledgment message without sufficient security capabilities, it should terminate the call.
If the calling and called terminals have compatible security capabilities, it shall be assumed by both sides that the H.245 channel shall operate in the secure mode negotiated.  Failure to set up the H.245 in the secure mode determined here should be considered a protocol error and the connection terminated.
8.	H245 Signalling AND PROCEDURES
In general, the privacy aspects of media channels are controlled in the same manner as any other encoding parameter; each terminal indicates its capabilities, the source of the data selects a format to use and  the receiver acknowledges or denies the mode.   All transport independent aspects of the mechanism such as algorithm selection are indicated in generic logical channel elements.  Transport specifics such as key/encryption algorithm synchronization are passed in transport specific structures.
8.1	Secure H.245 Channel Operation
Assuming that the connection procedures in the previous section  ( REF _Ref379881553 * MERGEFORMAT 7.	Connection Establishment Procedures) indicate a secure mode of operation, the negotiated handshake and authentication shall occur for the H.245 logical channel before any other H.245 messages are exchanged.  If negotiated, any exchange of certificates shall occur using any mechanism appropriate for the H series terminal(s).  After completing the securing of the H.245 channel, the terminals use the H.245 protocol in the same manner that they would in an insecure mode.
8.2	Unsecured H.245 Channel Operation
Alternatively, the H.245 channel may operate in an unsecured manner and the two entities open a secure logical channel with which to perform authentication and/or shared-secret derivation.  For example TLS or IPSEC may be utilized by opening a  logical channel with the datatype containing a value for  encryptionData. This channel could then be used to derive a shared secret which protects any media session keys or to transport the EncryptionSync.
8.3	Capability Exchange
Following the procedures in H.245 Section 8.3 - Capability Exchange Procedures, and the appropriate H series System Recommendation, endpoints exchange capabilities using H.245 messages.  These capability sets may now contain definitions which indicated security and encryption parameters.  For example, an endpoint might provide capabilities to send and receive H.261 video.  It may also signal the ability to send and receive encrypted H.261 video.
Each encryption algorithm that is utilized in conjunction with a particular media codec, implies a new capability definition.  As with any other capability, endpoints may supply both independent and dependent  encrypted codecs in their exchange.  This will allow endpoints to scale their security capabilities based upon overhead and resources available.
After capability exchange has been completed, endpoints may open secure logical channels for media in the same manner that they would in an insecure manner.
8.4	Master role
The H.245 master-slave is used to establish the master entity for the purpose of bi-directional channel operation and other conflict resolution.   This role of master is also utilized in the security methods.  Although the security mode(s) of a media stream is set by the source (in deference to the capabilities of the receiver), the master is the endpoint which generates the encryption key.   This generation of the encryption key is done, regardless of whether the master is the receiver or the source of the encrypted media. In order to allow for multicast channel operation with shared keys, the MC (also the master) should generate the keys.
8.5	Logical Channel Signalling
Endpoints open secure media logical channels in the same manner that they open unsecured media logical channels.  Each channel may operate in a completely independent manner from other channels - in particular where this pertains to security. The particular mode shall be defined in the OpenLogicalChannel  dataType field.   The initial encryption key shall be passed in either the OpenLogicalChannel or OpenLogicalChannalAck depending on the master/slave relationship of the originator of the OpenLogicalChannel. 
The OpenLogicalChannelAck shall act as confirmation of the encryption mode.  If the openLogicalChannel is unacceptable to the recipient either dataTypeNotSupported or dataTypeNotAvailable (transient condition) shall be returned in the cause field of the OpenLogicalChannelReject.
During the protocol exchange that establishes the logical channel, the encryption key shall be passed from the Master to the slave (regardless of who initiated the OpenLogicalChannel). For media channels opened by an endpoint (other than the Master), the Master shall return the initial encryption key and the initial synchronization point in the OpenLogicalChannelAck (in the encryptionSync field). For Media Channels opened by the Master the OpenLogicalChannel  shall include the initial encryption key and the synchronization point in the encryptionSync field.
9.	Multipoint Procedures
9.1	Authentication
Authentication shall occur between an endpoint and the MC(U) in the same manner that it would in a point to point conference.   The MC(U) shall set the policy concerning level and stringency of authentication.  As stated in section  REF _Ref379881675 \n 0 the MC(U) is trusted; existing endpoints in a conference may be limited by the authentication level employed by the MC(U).  New ConferenceRequest/ConferenceResponse commands, allow endpoints to obtain the certificates of other participants in the conference from the MC(U).  As outlined in H.245 procedures, endpoints in a multipoint conference may request other endpoint certificates via the MC, but may not be able perform direct cryptographic authentication within the H.245 channel.
9.2	Privacy
MC(U) shall win all  master/slave exchanges and as such shall supply encryption key(s) to participants in a multipoint conference.  Privacy for individual sources within a common session (assuming multicast) may be achieved with individual or common keys.  These two modes may be arbitrarily chosen by the MC(U) and shall not be controllable from any particular endpoint except in modes allowed by MC(U) policy.  In other words, a common key may be used across multiple logical channels as opened from different sources.
10.	Authentication Signalling AND PROCEDURES
10.1	Introduction
There are two types of authentication that may be utilized.  The first type is symmetric encryption based that requires no prior contact between the communicating entities.  The second type is based on the ability to have some prior shared secret (further referenced as subscription based).  Two forms of subscription-based authentication are provided; password and certificate.
10.2	Diffie-Hellman with optional Authentication
The intent is not to provide absolute, user-level authentication.   This method provides signalling to generate a shared secret between two entities which may lead to keying material for private communications.
At the end of this exchange both the entities will possess a shared secret key along with a chosen algorithm with which to utilize this key.  This shared secret key may now be used on any subsequent request/response exchanges.  It should be noted, that in rare cases the Diffie-Hellman exchange may generate known weak keys for particular algorithms.  When this is the case, either entity should disconnect and reconnect to establish a new key set.
The first phase of the figure below, demonstrates the data exchanged during the Diffie-Hellman. The second phase allows for application or protocol specific request messages to be authenticated by the responder.   Note that a new random value may be returned with each response.
Note: An optional signature element may also be provided. Tthese are illustrated in italics below.
EMBED Word.Picture.8
Figure A
[ ] indicates a sequence of tokens
() indicates a particular token, which may contain multiple elements
{}EDH-Secret indicates the contained values are encrypted utilizing the Diffie-Hellman secret
EPB knows which shared secret key to use to decipher the generalIDb identifier by associating it with the generalIDa, which should also be passed in the message.  Note that the encrypted value in phase 2 is passed in the generalID field of a clearToken to simplify encoding.
10.3	Subscription Based Authentication
10.3.1	Introduction
Although the procedures outlined here (and the ISO algorithms from which they are derived) are bi-directional in nature, they may be utilized in only one direction if authentication is only needed in that direction.  These exchanges assume that each end possesses some well known identifier (such as a text identifier) which uniquely identifies it.  A further assumption is made that there is a mutually acceptable reference to time (from which to derive timestamps).  The amount of time skew that is acceptable is a local implementation matter.
There are three different variations that may be implemented depending on requirements:
password based with symmetric encryption
password based with hashing
Certificate based with signatures
In all cases the token will contain the information as described in the following sections depending on the variation chosen.  Note that in all cases, the generalID may be known through configuration or directory lookup rather than in band protocol exchange.
10.3.2	Password with symmetric encryption
Shown below is the token format and the message exchange required to perform this type of authentication. This protocol is based on ISO 9798-2, (5.2.1), it is assumed that an identifier and associated password are exchanged during subscription. The encryption key is length N octets (as indicated by the AlgorithmID), and is formed as follows:
- If password length  =   N, Key = password
- if password length <   N, the key is padded with zeros
- if password length >   N, the first N octets are assigned to the key, then the N+Mth octet of the password is XORd  to the Mmod(N)th octet (for all octets beyond N). (i.e. all extra password octets are repeatedly folded back on the key by XORing)
EMBED Word.Picture.8
Note1: that the return token from EPB is optional; if omitted, only one-way authentication is achieved.
Note2: Ek-pw indicates values that are encrypted using the key k derived from the password pw.
10.3.3	Password with hashing
Shown below is the token format and the message exchange required to perform this type of authentication. This protocol is based on ISO 9798-4, (5.2.1), it is assumed that an identifier and associated password are exchanged during subscription. 
EMBED Word.Picture.8
Note1:  that the return token from EPB is optional; if omitted, only one-way authentication is achieved
Note2: Hash  indicates a hashing function that operates on the contained values
10.3.4	Certificate based with signatures
Shown below is the token format and the message exchange required to perform this type of authentication. This protocol is based on ISO 9798-3, (5.2.1), it is assumed that an identifier and associated certificate are assigned/exchanged during subscription.  
Note: An optional certificate element may also be provided these are illustrated in italics below.  
EMBED Word.Picture.8
Note1: The return token from EPB is optional; if omitted, only one-way authentication is achieved.  
Note2: A payment type certificate may be optionally included by the EPA originator.
Note3: Sign indicates a signing function (from associated certificate) performed on the contained values.

11.	Media Stream Encryption Procedures
Media streams shall be encoded using the algorithm and key as presented in the H.245 channel.  The following figures show the general flow.  Note that the transport header is attached to the transport SDU after the SDU has been encrypted.  The opaque segments indicate privacy.  As new keys are received by the transmitter and used in the encryption, the SDU header shall indicate in some manner to the receiver that the new key is now in use.  For example, in H.323 the RTP header (SDU) will change its payload type to indicate the switch to the new key. 
EMBED PowerPoint.Slide.8
Encryption of Media
EMBED PowerPoint.Slide.8
Decryption of Media
11.1	Media Session Keys 
Included in the encryptionUpdate is the h235Key. The h235Key is ASN.1 encoded within the context of the H.235 ASN.1 tree and passed as an opaque octet string with respect to H.245. The key may be protected by utilizing one of the three possible mechanisms as they are passed between two endpoints.  
If the H.245 channel is secure, no additional protection is applied to the key material. The key is passed in the clear with respect to this field; the ASN.1 choice of  secureChannel is utilized.  
If a secret key and algorithm has been established outside the H.245 channel as a whole (i.e. outside H.323 or on a h235Control logical channel), the shared secret is used to encrypt the key material, the resultant enciphered key is included here.  In this case the ASN.1 choice of sharedSecret  is used. 
Certificates may be used when the H.245 channel is not secure, but may also be used in addition to the secure H.245 channel. When certificates are utilized the key material is enciphered using the certificates public key and the ASN.1 construct certProtectedKey.
At any point in a conference, a receiver (or transmitter) may request a new key (encryptionUpdateRequest).  One reason it might do this is if it suspects that it has lost synchronization of one of the logical channels.  The Master receiving this request shall generate new key(s) in response to this command.  The Master may also decide asynchronously to distribute new key(s), if so it shall use the encryptionUpdate message.
After receiving an encryptionUpdateRequest, a Master shall send out encryptionUpdate.  If the conference is a multipoint one, the MC (also the master) should distribute the new key to all receivers before it gives this key to the transmitter.  The transmitter of the data on the logical channel shall utilize the new key at the earliest possible time after receiving the message.
A transmitter (assuming it is not the master) may also request a new key.  If the transmitter is part of a multipoint conference the procedure shall be as follows: 
the transmitter shall send the encryptionUpateRequest to the MC (master)
the MC should generate a new key(s) and send an encryptionUpdate message to all conference participants except the transmitter.
After distributing the new keys to all other participants the MC shall send the encryptionUpdate to the transmitter.  The transmitter shall then utilize the new key.
12.	Security Error Recovery
This document does not specify or recommend any methods by which endpoints may monitor their absolute  privacy. It does however recommend actions to be taken when privacy loss is detected.
If either endpoint detects a breach in the security of the call connection channel (e.g. H.225.0 for H.323), it should immediately close the connection following the protocol procedures appropriate to the particular endpoint  [for H.323 section 8.5 with the exception of step 5].   
If either endpoint detects a breach in the security of the H.245 channel or the secured data (h235Control) logical channel, it should immediately close the connection following the protocol procedures appropriate to the particular endpoint  [for H.323 section 8.5 with the exception of step 5].   
If any endpoint detects a loss of privacy on one of the logical channels it should immediately request a new key  (encryptionUpdateRequest) and/or close the logical channel.   At the discretion of the MC(U), a loss of privacy on one logical channel may cause all other logical channels to be closed and/or re-keyed at the discretion of the MC(U).  MC(U) shall forward encryptionUpdateRequest, encryptionUpdate to any and all endpoints affected.
At the discretion of the MC(U), a security error on an individual channel may cause the connections to be closed on all of the conference endpoints - thus ending the conference.
ANNEX a: H.235 ASN.1
H235-SECURITY-MESSAGES DEFINITIONS AUTOMATIC TAGS ::=
BEGIN
-- EXPORTS All
ChallengeString	::= OCTET STRING (SIZE(8..128))
TimeStamp			::= INTEGER(1..4294967295) -- seconds since 00:00 1/1/1970 UTC
RandomVal			::= INTEGER
Password				::= BMPString (SIZE (1..128))
Identifier			::= BMPString (SIZE (1..128))
KeyMaterial			::= BIT STRING(SIZE(1..2048))
NonStandardParameter ::= SEQUENCE
{
    nonStandardIdentifier	OBJECT IDENTIFIER,
    data			OCTET STRING
}
-- if local octet representations of these bit strings are used they shall 
-- utilize standard Network Octet ordering (e.g. Big Endian)
DHset ::= SEQUENCE  
{
    halfkey		BIT STRING (SIZE(0..2048)), -- = g^x mod n
    modSize		BIT STRING (SIZE(0..2048)), --  n
    generator	BIT STRING (SIZE(0..2048)), -- g
    ...
}
TypedCertificate ::= SEQUENCE
{
    type			OBJECT IDENTIFIER,
    certificate	OCTET STRING,
    ...
}
AuthenticationMechanism	 ::=CHOICE 
{
    dhExch     	NULL, -- Diffe-Hellman
    pwdSymEnc	NULL, -- password with symmetric encryption
    pwdHash		NULL, -- password with hashing
    certSign		NULL, -- Certificate with signature
    ipsec		NULL, -- IPSEC based connection
    tls			NULL,
    nonStandard 	NonStandardParameter, -- something else.
    ...
}
ClearToken		::= SEQUENCE  -- a `token' may contain multiple value types.
{	
    timeStamp		TimeStamp OPTIONAL,
    password			Password OPTIONAL,
    dhkey			DHset OPTIONAL,
    challenge		ChallengeString OPTIONAL,
    random			RandomVal OPTIONAL,
    certificate		TypedCertificate OPTIONAL,
    generalID		Identifier OPTIONAL,
    nonStandard 		NonStandardParameter OPTIONAL,
    ...
}
ALGORITHM-IDENTIFIER ::= TYPE-IDENTIFIER
--
-- Start all the cryptographic parameterized types here....
--
SIGNED { ToBeSigned } ::= SEQUENCE {
   toBeSigned  	ToBeSigned,
   algorithmOID  OBJECT IDENTIFIER, 
   paramS 		Params,	-- any 'runtime' parameters
   signature   	BIT STRING
} ( CONSTRAINED BY { -- Verify or Sign Certificate -- } )
ENCRYPTED { ToBeEncrypted } ::= SEQUENCE {
   algorithmOID  	OBJECT IDENTIFIER, 
   paramS 			Params,	-- any 'runtime' parameters
   encryptedData  	OCTET STRING
} ( CONSTRAINED BY { -- Encrypt or Decrypt -- ToBeEncrypted } )
HASHED { ToBeHashed } ::= SEQUENCE {
   algorithmOID  	OBJECT IDENTIFIER, 
   paramS 			Params,	-- any 'runtime' parameters
   hash				BIT STRING
} ( CONSTRAINED BY { -- Hash -- ToBeHashed } )
IV8 ::= OCTET STRING (SIZE(8))
-- signing algorithm used must select one of these types of parameters 
-- needed by receiving end of signature.
Params ::= SEQUENCE {
    null		NULL,	-- no value needed
    ranInt	INTEGER OPTIONAL, -- some integer value
    iv8		IV8 OPTIONAL,	-- 8 octet initialization vector
    ...
}
EncodedGeneralToken ::= TYPE-IDENTIFIER.&Type (ClearToken -- general usage token
PwdCertToken ::= ClearToken (WITH COMPONENTS {..., timeStamp, generalID })
EncodedPwdCertToken ::= TYPE-IDENTIFIER.&Type (PwdCertToken)
CryptoToken::= CHOICE
{
cryptoEncryptedToken SEQUENCE  General purpose/application specific token
    {
    	tokenOID  	OBJECT IDENTIFIER, 
    	token 		ENCRYPTED { EncodedGeneralToken }
    },
    cryptoSignedToken  SEQUENCE -- General purpose/application specific token
    {
    	tokenOID  OBJECT IDENTIFIER, 
    	token 		SIGNED { EncodedGeneralToken }
    },
    cryptoHashedToken SEQUENCE -- General purpose/application specific token
    {
    	tokenOID  		OBJECT IDENTIFIER, 
    	hashedVals		ClearToken,
    	token HASHED { EncodedGeneralToken }
    },
    cryptoPwdEncr 	ENCRYPTED { EncodedPwdCertToken },
    ...
}
-- These allow the passing of session keys within the H.245 OLC structure.
-- They are encoded as standalone ASN.1 and based as an OCTET STRING within H.245
H235Key	::=CHOICE  -- this is used with the H.245 h235Key field
{
    secureChannel	KeyMaterial,
    sharedSecret		ENCRYPTED {EncodedKeySyncMaterial},
    certProtectedKey	SIGNED { EncodedKeySignedMaterial },
    ...
}
KeySignedMaterial ::= SEQUENCE {
    generalId		Identifier, -- slave's alias
    mrandom	RandomVal, -- master's random value
    srandom	RandomVal OPTIONAL, -- slave's random value
    timeStamp	TimeStamp OPTIONAL, -- masters timestamp for unsolicted EU
    encrptval	ENCRYPTED {EncodedKeySyncMaterial }
}
EncodedKeySignedMaterial ::= TYPE-IDENTIFIER.&Type (KeySignedMaterial)
KeySyncMaterial	::=SEQUENCE
{
    generalID		Identifier,
    keyMaterial 	KeyMaterial,

}
EncodedKeySyncMaterial	::=TYPE-INDENTIFIER.&Type (KeySyncMaterial)
H235CertificateSignature	::=SEQUENCE
{
    certificate			TypedCertificate,
    responseRandom		RandomVal,
    requesterRandom	RandomVal OPTIONAL,
    signature			SIGNED { EncodedReturnSig },

}
ReturnSig ::= SEQUENCE {
    generalId			Identifier, -- slave's alias
    responseRandom 	RandomVal,
    requestRandom 		RandomVal OPTIONAL,
    certificate  		TypedCertificate OPTIONAL - requested certificate
}
EncodedReturnSig ::= TYPE-IDENTIFIER.&Type (ReturnSig)
END	-- End of H235-SECURITY-MESSAGES DEFINITIONS 
ANNEX B: H.323 Specific Topics
1. Background
Shown below is a diagram giving an overview of the H.235 scope within the H.323 recommendation.
EMBED Word.Picture.8
For H.323 the signalling of  usage of TLS, IPSEC or a proprietary mechanism on the H.245 control channel shall occur on the secured or unsecured H.225.0 channel during the initial Q.931 message exchange.
2. Signalling and Procedures
The procedures outlined in H.323, Section 8 - Call Signalling Procedures, shall be followed.  The H.323 endpoints shall have the ability to encode and recognize the presence (or absence) of security requirements (for the H.245 channel) signaled in the H.225.0 messages.
In the case where the H.225.0 channel itself is to be secured, the same procedures in H.323, Section 8 shall be followed.  The difference in operation is that the communications shall only occur after connecting to the secure TSAP identifier and using  the predetermined security modes (e.g. TLS).   Due to the fact that the H.225.0 messages are the first exchanged when establishing H.323 communications, there can be no security negotiations in band for H.225.0.  In other words, both parties must know a priori that they are using a particular security mode.  For H.323 on IP, an alternative Well Known Port (1300) is utilized for TLS secured communications.
One purpose of  H.225.0 exchanges as they relate to H.323 security, is to provide a mechanism to set up the secure H.245 channel.  Optionally, authentication may occur during the exchange of H.225.0 messages.  This authentication may be  certificate or password based,  utilizing encryption and/or hashing (i.e. signing).  The specifics of these modes of operation are described in sections ( REF _Ref394290868 \n 0- REF _Ref394290904 \n 0).
An  H.323 endpoint that receives a Setup message with the h245SecurityCapability set  shall respond with the corresponding, acceptable h245SecurityMode in the Connect message.  In the cases in which there are no overlapping capabilities, the called terminal may refuse the connection by sending a Release Complete with the reason code set to SecurityDenied. This error is intended to convey no information about any security mis-match and the calling terminal will have to determine the problem by some other means.  In cases where the calling terminal receives a Connect message without sufficient or an acceptable security mode, it may terminate the call with a Release Complete with SecurityDenied. In cases where the calling terminal receives a Connect message without any security capabilities, it may terminate the call with a Release Complete with undefinedReason.
If the calling terminal receives an acceptable h245Security  mode, it shall open and operate the H.245 channel in the indicated secure mode.  Failure to set up the H.245 in the secure mode determined here should be considered a protocol error and the connection terminated.
2.1   Revision 1 Compatibility 
A security capable endpoint shall not return any security related fields, indications or status to the non-security capable endpoint.  If a callee receives a Setup message that does not contain the H245Security capabilities and/or authentication token, it may return a ReleaseComplete to refuse the connection; but it shall use the reason code of UndefinedReason in this case.  In a corresponding manner, if a caller receives a Connect message without an H245SecurityMode and/or authentication token having sent a Setup message with H245Security and/or authentication token it may also terminate the connection by issuing a ReleaseComplete with a reason code of UndefinedReason.
3. RTP/RTCP Issues
The use of encryption on the RTP streamitem A (initialization vector, sentence  will follow the general methodology recommended in the document referenced in [RTP].  The encryption of the media shall occur in an independent, packet by packet basis. The RTP header (including the payload header) shall not be encrypted.   Synchronization of new keys and encrypted text is based upon dynamic payload type.
Initial encryption key is presented by the master in conjunction with the dynamic payload number (via EncryptionSync in H.245).  The receiver(s) of the media stream shall start initial use of the key upon receipt of this payload number in the RTP header.  New key(s) may be distributed at any time by the master endpoint.  The synchronization of the newer key with the media stream shall be indicated by the changing of the payload type to a new dynamic value.  Note that the specific values dont matter, as long as they change for every new key that is distributed.  
It is assumed that encryption is applied just to the payload in each RTP packet; the RTP headers remaining in the clear. It is assumed that all RTP packets must be a multiple of whole octets. How the RTP packets are encapsulated at the transport or network layer is not relevant to this Recommendation. All modes must allow for lost (or out-of-sequence) packets,  in addition to padding packets to an appropriate multiple of octets.
Deciphering the stream must be stateless due to the fact that packets may be lost; each packet decipherable on its own merits. Two requirements of  Block algorithm mode shall operate as follows:
A.	Initialization vectors
Most block modes involve some chaining; each encryption cycle depends in some way on the output of the previous cycle. Therefore, at the beginning of a packet, some initial block value (usually called an Initialization Vector - IV) must be provided in order to start the encryption process. Independent of how many stream octets are processed on each encryption cycle, the length of the IV is always equal to the length of a block. All modes except Electronic Code Book (ECB) mode require an IV. In all cases, an IV shall be constructed from the first B (where B is the block size) octets of: (Seq# + Timestamp).  This pattern should be repeated until enough octets have been generated. It should be noted that the IV generated in this manner may produce a key pattern that is considered weak for a particular algorithm.
B.	Padding
ECB and CBC modes always process the input stream a block at a time, and, while CFB and OFB can process the input in any number of octets, N (<=B), it is recommended that N=B.
Two methods are available to handle packets whose payload is not a multiple of blocks.
1.	Ciphertext Stealing for ECB and CBC; Zero pad for CFB and OFB
2.	Padding in the manner prescribed by [RTP] (section 5.1)
[RTP] section 5.1 describes a method of padding in which the payload is padded to a multiple of blocks, the last octet set with the number of padding octets (including the last), and the P bit set in the RTP header. The value of the pad should be determined by the normal convention of the cipher algorithm..
All H.235 implementations shall  support both schemes. The scheme in use can be deduced as follows: If the P bit is set in the RTP header, then the packet is padded; if the packet is not a multiple of B and the P bit is not set, then Ciphertext Stealing applies, else the packet is a multiple of B, and padding does not apply.
Integrity and replay protection of the RTP stream is for further study.
Application of cryptographic techniques to RTCP elements is for further study.
4. RAS Signalling/Procedures for Authentication
4.1 Introduction
This annex will not explicitly provide any form of message privacy between gatekeepers and endpoints. There are two types of authentication that may be utilized.  The first type is symmetric encryption based that requires no prior contact between the endpoint and Gatekeeper.  The second type is subscription based and will have two forms, password or certificate.   All of these forms are derived from the procedures shown in sections  REF _Ref394290868 \n 0,  REF _Ref399040981 \n 0,  REF _Ref399041035 \n 0 and   REF _Ref394290904 \n 0. In this annex, the generic labels (EPA and EPB) shown in the aforementioned sections will represent the Endpoint and Gatekeeper respectively.
4.2 Endpoint-Gatekeeper Authentication (Non-Subscription Based)
This mechanism may provide the Gatekeeper with a cryptographic link that a particular endpoint which previously registered, is the same one that issues subsequent RAS messages.  It should be noted that this may not provide any authentication of the Gatekeeper to the endpoint, unless the optional signature element is included.  The establishment of the identity relationship occurs when the terminal issues the GRQ as outlined in H.323 section 7.2.1.   The Diffie-Hellman exchange shall occur in conjunction with the GRQ and GCF messages as shown in the first phase of section  REF _Ref394290868 \n 0.  This shared secret key shall now be used on any subsequent RRQ/URQ from the terminal to the gatekeeper.  If a Gatekeeper operates in this mode and receives a GRQ without a token containing the DHset or an acceptable algorithm value, it shall return a securityDenial reason code in the DRJ.
The Diffie-Hellman shared secret key as created during  the GRQ/GCF exchange may be used for  authentication  on subsequent xRQ messages.   The following procedures shall be used to complete this mode of authentication.
Terminal (xRQ):
The terminal shall provide all of the information in the message as described in the appropriate H.225.0 sections.
The terminal shall encrypt the GatekeeperIdentifier (as returned in the GCF) using the shared secret key that was negotiated. This shall be passed in a cryptoToken as the generalID.
The 16 bits of the random and then the requestSeqNum shall be XORd with each 16 bits of  the GatekeeperIdentifier.  If the GatekeeperIdentifier does not end on an even 16 boundary, the last 8 bits of the GatekeeperIdentifier shall be XORd with the least significant octet of the random value and then requestSeqNum.  The GatekeeperIdentifier shall be encrypted using the selected algorithm in the GCF (integrity)  and utilizing the entire shared secret.
In order to cryptographically  link this and subsequent messages with the original registrant (the endpoint that issued the RRQ) the most recent random value returned shall be utilized  (this value may be one newer than the value returned in the RCF - from a later xCF message).
Gatekeeper (xCF/xRJ)
Gatekeeper shall encrypt its GatekeeperIdentifier (following the above procedure) with the shared secret key associated with the endpoint alias and compare this to the value in the xRQ
Gatekeeper shall return xRJ if the two encrypted values do not match.
If GatekeeperIdentifier matches Gatekeeper shall apply any local logic and respond with xCF or xRJ.
If  an xCF is sent by the Gatekeeper, it should contain an assigned EndpointIdentifier and a new random value in the random field of a clearToken.
Refer to the second phase of the figure contained in section  REF _Ref394290868 \n 0 for a graphical representation of this exchange. The gatekeeper knows which shared secret key to use to decipher the Gatekeeper identifier by the Alias name in the message.
4.3 Endpoint-Gatekeeper Authentication(Subscription Based)
All RAS messages other than GRQ/GCF should contain the authentication tokens required by the specific mode of operation.  There are three different variations that may be implemented depending on requirements and environment:
password based with symmetric encryption
password based with hashing
Certificate based with signatures
In all cases the token will contain the information as described in the following sections depending on the variation chosen.  If a Gatekeeper operates in a secure mode and receives a RAS message  without  an acceptable token value, it shall return a securityDenial reason code in the reject message. In all cases the return token from GK is optional; if omitted, only one-way authentication is achieved]
4.3.1 Password with symmetric encryption
EMBED Word.Picture.8
4.3.2 Password with hashing
It is assumed that an Alias and associated password are exchanged out of  band to this particular message exchange. 
EMBED Word.Picture.8
4.3.3 Certificate based with signatures
EMBED Word.Picture.8
5. Non-terminal Interactions
5.1 Gateway
As stated in section  REF _Ref379882131 \n 0, an H.323 Gateway should be considered a trusted element.  This includes protocol gateways (H.323-H.320 etc.) and security gateways (proxy/firewalls).  The media privacy can be assured between the communicating endpoint and the gateway device; but what occurs on the far side of the gateway should be considered insecure by default.
ANNEX C: H.324 Specific Topics
FFS
Appendix I:  H.323 Implementation Details
1. Ciphertext padding methods
There is a description of Ciphertext Stealing in [Schneier], p191, p196. The diagrams that follow illustrate the technique.

2. New Keys 
The  procedures outlined in H.323 section 8.5 are completed by an MC to eject a participant from a conference. The  Master may generate new encryption keys for the logical channels (and not distribute them to the ejected party); this may be used to keep the ejected party from monitoring the media streams. 
3. H.323 Trusted Elements
In general MC(U)s, Gateways and Gatekeepers (if implementing the gatekeeper-routed model) are trusted                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           with respect to the privacy of the control channel.  If the connections establishment channel (H.225.0) is secured and routed through the Gatekeeper, it must also be trusted. If any of these H.323 components must operate on the media streams (i.e. mixing, transcoding) then by definition, they shall also be trusted for the media privacy. 
Firewall Proxies (though not H.323-specific elements) may also be trusted, since they terminate connections, and may well  have to manipulate the messages and media streams.
4. Implementation Examples
These next sections describe example implementations that might be developed within the H.235 framework.  These are not intended to constrain the many other possibilities available within this recommendation; rather to give more concrete examples of usage within H.323. 
4.1 Tokens
This section will describe an example usage of security tokens to obscure or hide destination addressing information.  The example scenario is an endpoint which wishes to make a call to another endpoint utilizing its well known alias. More specifically this involves an H.323 endpoint, Gatekeeper, POTS-Gateway, and telephone as illustrated below.
EMBED Word.Picture.8
Currently, H.323 may operate in a manner similar to a telephone network with caller-ID.  This scenario will illustrate a situation in which the callee does not want to expose its physical address, while still allowing the call to complete.  This may be important in POTS-H.323 gateways, where the target phone number may need to stay private.
Assume that EPA is trying to call POTSB, and POTSB does not want to expose its E.164 phone number to EPA. (How this policy is established is beyond the scope of this example). 
EPA will send an ARQ to its Gatekeeper to resolve the address of the POTS telephone as represented by its alias/GW.  The Gatekeeper would recognize this as a private alias, knowing that in order to complete the connection it must return the POTS-gateway address. (Similar to returning the address of an H.320 Gateway if an H.320 endpoint is called by an H.323 endpoint).
In the returned ACF, the Gatekeeper returns the POTS-Gateways address as expected.  The addressing information  that is required to dial to the end telephone (i.e. the telephone number) is returned in an encrypted token included in the ACF.  This encrypted token contains the actual E.164 (phone number) of the telephone which cannot  be deciphered nor understood by the caller.  (i.e. EPA)
The endpoint issues the SETUP message to the Gateway device (whose call signalling address was returned in the ACF) including the opaque token(s) that it received with the ACF.
The Gateway upon receiving the SETUP, issues its ARQ to its Gatekeeper including any token(s) that were received in the SETUP.
The Gatekeeper is able to decipher the token(s) and return the phone number in the ACF.
Partial ASN.1 of an example token structure is shown below, with  the field contents described.  Assume we utilize the cryptoEncodedGeneralToken to contain the encrypted telephone number. 
An implementation might choose a tokenOID denoting this token as containing the E.164 phone number.  The particular method that is used to encrypt this phone number (for example 56bit DES) would be included in the ENCRYPT definition algorithmOID.
CryptoToken::= CHOICE
{
    cryptoEncodedGeneralToken SEQUENCE   -- General purpose/application specific token
{
    	tokenOID  OBJECT IDENTIFIER, 
ENCRYPTED { EncodedGeneralToken }
    },
.
.
. [abbreviated text]
.
}
The CryptoToken would be passed in the SETUP (from EPA to GW) and the ARQ  (from the GW to the Gatekeeper) messages as outlined above.  After the Gatekeeper decrypted the token (the telephone number) it would pass the clear version of this in the clearToken
4.2  Password
In this example, it is assumed that the user is a subscriber to the Gatekeeper (i.e. the user will be in its zone) and has an associated subscription ID and password. The user would register with the Gatekeeper using the subscription ID (as passed in an alias - H323ID) and encrypting a challenge string presented by the Gatekeeper. This assumes that the Gatekeeper also knows the password associated with the subscription ID. The Gatekeeper will authenticate the user by verifying that the challenge string was correctly encrypted.
The example registration procedure with Gatekeeper authentication is as follows:
If the endpoint uses GRQ to discover a Gatekeeper, one of the aliases in the message would be the subscription ID (as an H323ID). The authenticationcapability would contain an AuthenticationMechanism of pwdSymEnc and the algorithmOIDs would be set to indicate the entire set of encryption algorithms supported by the endpoint. (For example one of these would be 56 bit DES in EBC mode.)
The Gatekeeper would respond with GCF (assuming it recognizes the alias) carrying a tokens element containing one ClearToken. This ClearToken would contain both a challenge and a timeStamp element. The challenge would contain 16 octets (To prevent replay attacks, the ClearToken should contain a timeStamp.) The authenticationmode should be set to pwdSymEnc and the algorithmOID should be set to indicate the encryption algorithm required by the Gatekeeper (for example, 56 bit DES in EBC mode)
If the Gatekeeper does not support any of the algorithmOIDs indicated in the GRQ, then it would respond with a GRJ containing a GatekeeperRejectReason of resourceUnavailable.
The endpoint application should then attempt to register with (one of) the GK(s) that responded with a GCF by sending an RRQ containing a cryptoEPPwdEncr in the cryptoTokens. The cryptoEPPwdEncr would have the algorithmOID of the encryption algorithm agreed to in the GRQ/GCF exchange, and the encrypted challenge.
The encryption key is constructed from the users password using the procedure described in section 13.3.3.34 of H.235.  The resulting  octet string is then used as the DES key to encrypt the challenge.
When the Gatekeeper receives the encrypted challenge in the RRQ, it would compare it to an identically generated encrypted challenge to authenticate the registering user. If the two encrypted strings do not match, the Gatekeeper should respond with an RRJ with the RegistrationRejectReason set to securityDenial. If they match, the Gatekeeper sends an RCF to the endpoint. 
If the Gatekeeper receives an RRQ which does not contain an acceptable cryptoTokens element then it should respond with an RRJ with a GatekeeperRejectReason of discoveryRequired. The endpoint, upon receiving such an RRJ may perform discovery which will allow the Gatekeeper/endpoint to exchange a new challenge. Note that the GRQ message may be unicast to the Gatekeeper.
4.3  IPSEC
In general, IPSec [13/IPSEC] can be used to provide Authentication and, optionally Confidentiality (i.e., encryption) at the IP layer transparent to whatever (application) protocol runs above. The application protocol does not have to be updated to allow this; only security policy at each end.
For example, to make maximum use of IPSec for a simple point-to-point call, the following scenario could be followed:
The calling endpoint and its gatekeeper would set policy to require the use of IPSec (Authentication and, optionally Confidentiality) on the RAS protocol. Thus, before the first RAS message is sent from the end point to the gatekeeper, the ISAKMP/Oakley daemon on the endpoint will negotiate security services to be used on packets to and from the RAS channel's well-known port. Once negotiation is complete the secured RAS channel will operate exactly as if it were not secured. Using this secure channel the gatekeeper will inform the end point of the address and port number of the call signalling channel in the called endpoint. 
After obtaining the address and port number of the call signalling channel, the calling endpoint would dynamically update its security policy to require the desired IPSec security on that address and protocol/port pair. Now, when the calling endpoint attempts to contact this address/port the packets would be queued while an ISAKMP/Oakley negotiation is performed between the end points. Upon completion of this negotiation, an IPSec Security Association (SA) for the address/port will exist and the Q.931 signalling can proceed.
On the Q.931 Setup and Connect exchange, the endpoints can negotiate the use of IPSec for the H.245 channel. This will allow the endpoints to again dynamically update their IPSec policy databases to force the use of IPSec on that connection.
As with the call signalling channel, a transparent ISAKMP/Oakley negotiation will take place before any H.245 packets are transmitted.  The authentication performed by this ISAKMP/Oakley exchange will be the initial attempt at user-to-user authentication, and will set up a (probably) secure channel between the two users on which to negotiate the characteristics of the audio channel.  If, after some person-to-person Q&A, either user is not satisfied with the authentication, different certificates can be chosen and the ISAKMP/Oakley exchange repeated.  
After each H.245 ISAKMP/Oakley authentication, new keying material is exchanged for the RTP Audio channel. This keying material is distributed by the Master on the secure H.245 channel. Because the H.245 protocol is defined for the master to distribute the media keying material on the H.245 channel (to allow for multipoint communication), it is not recommended that IPSec be used for the RTP channel.
An encrypted H.245 channel is a potential problem for Proxy or NAT Firewall, since the dynamically-assigned port numbers are carried in the H.245 protocol. Such Firewalls would have to decipher, modify and re-encipher the protocol to operate correctly. For this reason, the Security Logical Channel was introduced into H.245. If this channel is used, the H.245 channel can remain unsecured; authentication and key-generation would be done with the Security Logical Channel. Logical Channel signalling would allow this channel to be protected with IPSec, and the secret key used on the Security Logical Channel would be used to protect the EncryptionSync distributed by the master on the H.245 channel.
Appendix II:  H.324 Implementation Details
FFS
Appendix III:  Other H series Implementation Details
FFS
APPENDIX IV: BIBLIOGRAPHY
[Daemon]
J. Daemon, Cipher and Hash function design, Ph.D. Thesis, Katholieke Universiteit Leuven, Mar 95.
[IPSEC]
Internet Engineering Task Force, 1997 The OAKLEY Key Determination Protocol draft-ietf-ipsec-oakley-02.txt, H. K. Orman
Internet Engineering Task Force, 1997 Internet Security Association and Key Management Protocol (ISAKMP) draft-ietf-ipsec-isakmp-08.text, D. Maughan, M. Schertler, M. Schneider and  J. Turner
Internet Engineering Task Force, 1997 IP Authentication Header draft-ietf-ipsec-auth-header-01.txt, S. Kent, and R. Atkinson
Internet Engineering Task Force, 1997 The resolution of ISAKMP with Oakley draft-ietf-ipsec-isakmp-oakley-04.txt, D. Harkins, D. Carrel
 [RTP]   	
Internet Engineering Task Force, 1996 RTP: A Transport Protocol for Real-Time Applications, RFC 1889,  H. Schulzrinne, S. Casner, R. Frederick, and V. Jacobson
[Schneier]
Applied Cryptography, Second Edition Protocols, Algorithms, and Source Code in C, Bruce Schneier: John Wiley & Sones, Inc., 1996
[TLS]
Internet Engineering Task Force, 1997 The TLS Protocol Version 1.0  draft-ietf-tls-protocol-03.txt,  T. Dieks, C. Allen
 It should be noted that if RTP packet size is larger than MTU size, partial loss (of fragment) will cause the whole RTP packet to be indecipherable.
White Paper - H.235 Version 1, 9/97
White Paper - H.235 Version 1, 9/97
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PAGE # "'Page: '#''"   IPSEC provides network security. Since IPSEC is one of the proposed ways of achieving authentication/confidentiality in this Recommendation, we should probably also add that The Recommendation also has provisions for incorporating any available security provided by the network (such as IPSEC).
PAGE # "'Page: '#''"   It might be useful to utilize an authoritative source to define the general terminology. The capitalization of terms changes from term to term.
PAGE # "'Page: '#''"   In other words, the certificate means a certified public key.  Would it be useful to refer to public keys instead of certificate, then?
PAGE # "'Page: '#''"   confidentiality is usually used as synonym of privacy
PAGE # "'Page: '#''"   The definition here does not include the hash functions (MD5, SHA).
PAGE # "'Page: '#''"   Use information unreadable or data unintelligible 
PAGE # "'Page: '#''"   Integrity also includes detecting any unauthorized alteration 
PAGE # "'Page: '#''"   This is usually used as a synonym of confidentiality.
PAGE # "'Page: '#''"   It might be useful to spell out that a private channel uses encryption and optional authentication procedures agreed on the secure channel.
PAGE # "'Page: '#''"   using proper public-key authentication method
PAGE # "'Page: '#''"   Again, see previous comment concerning term certificatePPe3.
PAGE # "'Page: '#''"   This implies that exchange of certificates is not based on a shared secret. In Section 10.1, certificates are included under subscription based which is defined as having a prior shared secret. They are inconsistent statements. It seems to me that the former is right, while the latter is not. See comment in section 10.1.
PAGE # "'Page: '#''"   In order to authenticate claimant (the presenter of a certified public key), the claimant must sign something provided by the verifier or the generalID of the verifier. The definition of verifier should be added to the list of definitions.
PAGE # "'Page: '#''"   This should probably be digital signatures.
PAGE # "'Page: '#''"   This sounds strange. I would say that we would be protected against man-in-the-middle attack only if we know who the correspondent is.
PAGE # "'Page: '#''"   Add subsection 6.2.2 for shared secret schemes, and subsection 6.2.3 for Other security protocols. In 6.2.2, we need to state that the Recommendation does not specify how the shared secret is established and managed.
PAGE # "'Page: '#''"   Isnt distribution done by the claimant by sending the certificate along with the digital signature to the verifier?
PAGE # "'Page: '#''"   does not provide any security at all.
PAGE # "'Page: '#''"   security (???)
PAGE # "'Page: '#''"   encryption parameters, including keys,
PAGE # "'Page: '#''"   Does this include the RTP headers, too?
PAGE # "'Page: '#''"   The first method is asymmetric Diffie-Hellman key exchange. It includes an optional public key based authentication, and it requires no prior direct contact between entities.
PAGE # "'Page: '#''"   There is an important difference between password and certificate based schemes as described here. In the password based scheme, EPB needs to know the password that EPA uses by means other than from EPA. However, in certificate based schemes, EPB could find the public-key of EPA directly from EPA by receiving the public key certificate from EPA. Hence, password based schemes (as described here) requires prior contact between EPA and EPB, but certificate based schemes do not. This difference should be highlighted
Moreover, there seems to be an inconsistency in the description of subscription based in this section and in section 6.2. See comment there.
PAGE # "'Page: '#''"   Things that I dont understand: what we are trying to establish in addition to the plain Diffie-Hellman handshake? It should be made clear that the procedure here is not authentication but a key-exchange (unless optional authentication is included). Why we are including the random number randomb and the timea etc (certainly, it does not protect against a man in the middle).  Is this a standard ISO or IETF protocol?  The first generalIDa should probably be generalIDb. The modulus and base should be defined for the Diffie-Hellman. How the optional authentication procedure differs from the authentication presented in the subsection 10.3.4?
PAGE # "'Page: '#''"   The meaning of the generalID should be defined somewhere.
PAGE # "'Page: '#''"   It might be more useful reuse password bytes instead of  padding.
PAGE # "'Page: '#''"   The first exchange of the generalIDs is not part of the authentication mechanism (presented in ISO 9798-2). It should be noted that each endpoint generates their own timeStamp.
PAGE # "'Page: '#''"   The first exchange of the generalIDs is not part of the authentication mechanism (presented in ISO 9798-2). It should be noted that each endpoint generates their own timeStamp. The generalID and timestamp values should be included in the ClearToken, but not the password. ( Annex A suggests that all information in the cryptoHashedToken is included in clear text as hashedVals ClearToken. 
We suggest that the CryptoToken is written as 
CryptoToken[timeStampa, generalIDb, (,timeStampa, generalIDb, password)Hash]
where (foo)Hash means only the hash value of foo. Another possibility is to use notation
CryptoToken[(,timeStampa, generalIDb)Hashpassword ]
where (foo)Hash implicitly includes the cleartext foo in the CryptoToken.
PAGE # "'Page: '#''"   Instead of using a hash function (such as MD5 or SHA-1) on (timeStamp, generalID, password), a better approach is to use HMAC which is defined in RFC2104. The former approach, generally referred to as keyed-xxx (where xxx is a hash function), is somewhat inferior to HMAC-xxx. The IETF also favors HMAC-xxx. 
PAGE # "'Page: '#''"   The first exchange of the generalIDs is not part of the authentication mechanism (presented in ISO 9798-3). It should be noted that each endpoint generates their own timeStamp.
PAGE # "'Page: '#''"   It should be noted what kind of transfer encoding is to be used, e.g., within h235Key.  The usage of the ASN.1 types should be specified somewhere in a very detailed way. How a type is signed? How it is encrypted? How a hash is generated? How we can generate a keyed hash?
PAGE # "'Page: '#''"   An important difference between TLS and IPSEC should probably be pointed out. TLS is usually application coupled (i.e., built into the application), while IPSEC is usually network coupled (i.e., built into the operating system). This could possibly be pointed out by incorporating a subsection for TLS in the Implementation Examples section, as has been done for IPSEC.
PAGE # "'Page: '#''"   What? A Q.931channel, probably?
PAGE # "'Page: '#''"   Will not follow?
PAGE # "'Page: '#''"   This footnote is indecipherable. The RTP uses underlying IP packet delivery, a UDP packet with missing fragments is never presented to the application  (i.e. the RTP protocol).
PAGE # "'Page: '#''"   This does not seem to make sense.  The IV is not a key, or a key pattern. Are there really weak initialization vectors? I think that here should be stated that the initial timestamp and sequence number should be generated by a cryptographically strong random number generator.
PAGE # "'Page: '#''"   Delete braces
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