General information about OpenID

Message Sequence Chart

Specification

official specs at http://openid.net/developers/specs/

OpenID Authentication 2.0

• Yadis (Yadis 1.0)
• rfc1750 Randomness Recommendations for Security
• rfc2104 HMAC: Keyed-Hashing for Message Authentication
• rfc2631 Diffie-Hellman Key Agreement Method
• rfc3275 (Extensible Markup Language) XML-Signature Syntax and Processing
• rfc3339 Date and Time on the Internet: Timestamps
• rfc3986 section 6 URI Generic Syntax; 6. Normalization and Comparison
• Extensible Resource Identifier (XRI) Resolution V2.0 - Committee Draft 02
• Extensible Resource Identifier (XRI) Syntax V2.0

OpenID Authentication 1.1

Extensions

• OpenID Attribute Exchange 1.0
• OpenID Simple Registration Extension 1.0