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HTTPsec Authentication Protocol

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Preamble

1. Introduction
1.1. Editorial Conventions
1.2. Terms
1.3. Identifiers
2. Summary
2.1. Authentication Model
2.2. Peer Identifiers
2.3. Protocol Operation
2.3.1. Initialization
2.3.2. Continuation
3. Protocol Messages
3.1. Initialization Messages
3.1.1. Initialization Request
3.1.2. Initialization Response
3.2. Continuation Messages
3.2.1. Continuation Request
3.2.2. Continuation Response
3.3. Challenge Messages
3.3.1. Challenge Response
3.4. Message Flow
4. Protocol Directives
4.1. id
4.2. dh
4.3. certificate
4.4. url
4.5. group
4.6. nonce
4.7. auth
4.8. token
4.9. signature
4.10. count
4.11. mac
4.12. digest
5. Other Headers
5.1. Content-Encoding
5.2. Cache-Control
5.3. Expires
6. Protocol Computations
6.1. Algorithms
6.1.1. Hash Algorithm
6.1.2. Public Key Algorithm
6.1.3. Encryption Scheme
6.1.4. Signature Scheme
6.1.5. Block Cipher
6.1.6. Block Cipher Mode
6.2. Header Canonicalization
6.3. Initialization Transcript
6.4. Continuation Request Transcript
6.5. Continuation Response Transcript
6.6. Shared Secret
6.7. Keys
6.7.1. MAC Keys
6.7.2. Cipher Keys
6.8. Message Body Ciphering
7. Message Validation
7.1. Initialization Request Validation
7.2. Initialization Response Validation
7.3. Continuation Request Validation
7.4. Continuation Response Validation
8. Cache Considerations
9. Security Considerations
10. References
11. Editor Address

5.2. Cache-Control

The Cache-Control header [HTTP][ 14.9] MUST be present in every initialization response and continuation response. It MUST contain at minimum the no-transform directive [HTTP][ 14.9.5]. See the Cache Considerations section for additional discussion.
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