Instant Messaging and Presence Protocol and SIP for Instant Messaging and Presence Leveraging Extensions
A presence and instant messaging system allows users to subscribe to each other and be notified of changes in state, and for users to send each other short instant messages. Protocol Impp (10) ([53,,,,,,]) develops an architecture for simple instant messaging and presence awareness and notification. It specifies in particular how authentication, message integrity, encryption and access control are integrated. Protocol Simple (11) (see in particular [164,,,,,]) focuses on the application of SIP to instant messaging and presence (IMP), compliant with the requirements listed in [52] and including the security and privacy requirements.
Each of the 2 protocols should satisfy the following security properties: Message Authentication, Replay Protection, Implicit Destination Authentication
In summary, both protocols should provide Authentication, Secrecy, Implicit Destination Authentication, and Replay Protection (G1-4,12).