RFC 3711:The Secure Real-time Transport Protocol (...
RFC-Ref

The Secure Real-time Transport Protocol (SRTP)


1. Introduction
1.1. Notational Conventions
2. Goals and Features
2.1. Features
3. SRTP Framework
3.1. Secure RTP
3.2. SRTP Cryptographic Contexts
3.2.1. Transform-independent parameters
3.2.2. Transform-dependent parameters
3.2.3. Mapping SRTP Packets to Cryptographic Contexts
3.3. SRTP Packet Processing
3.3.1. Packet Index Determination, and ROC, s_l Update
3.3.2. Replay Protection
3.4. Secure RTCP
4. Pre-Defined Cryptographic Transforms
4.1. Encryption
4.1.1. AES in Counter Mode
4.1.2. AES in f8-mode
4.1.2.1. f8 Keystream Generation
4.1.2.2. f8 SRTP IV Formation
4.1.2.3. f8 SRTCP IV Formation
4.1.3. NULL Cipher
4.2. Message Authentication and Integrity
4.2.1. HMAC-SHA1
4.3. Key Derivation
4.3.1. Key Derivation Algorithm
4.3.2. SRTCP Key Derivation
4.3.3. AES-CM PRF
5. Default and mandatory-to-implement Transforms
5.1. Encryption: AES-CM and NULL
5.2. Message Authentication/Integrity: HMAC-SHA1
5.3. Key Derivation: AES-CM PRF
6. Adding SRTP Transforms
7. Rationale
7.1. Key derivation
7.2. Salting key
7.3. Message Integrity from Universal Hashing
7.4. Data Origin Authentication Considerations
7.5. Short and Zero-length Message Authentication
8. Key Management Considerations
8.1. Re-keying
8.1.1. Use of the <From, To> for re-keying
8.2. Key Management parameters
9. Security Considerations
9.1. SSRC collision and two-time pad
9.2. Key Usage
9.3. Confidentiality of the RTP Payload
9.4. Confidentiality of the RTP Header
9.5. Integrity of the RTP payload and header
9.5.1. Risks of Weak or Null Message Authentication
9.5.2. Implicit Header Authentication
10. Interaction with Forward Error Correction mechanisms
11. Scenarios
11.1. Unicast
11.2. Multicast (one sender)
11.3. Re-keying and access control
11.4. Summary of basic scenarios
12. IANA Considerations
13. Acknowledgements
14. References
14.1. Normative References
14.2. Informative References
15. Appendix A: Pseudocode for Index Determination
16. Appendix B: Test Vectors
16.1. B.1. AES-f8 Test Vectors
16.2. B.2. AES-CM Test Vectors
16.3. B.3. Key Derivation Test Vectors
17. Authors' Addresses
18. Full Copyright Statement
19. Intellectual Property
20. Acknowledgement

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