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