Instant Messaging (IM)
Client-Server model
XMPP / Jabber protocol
XMPP / Jabber server

Concepts bullet Credentials

What are credentials?

Credentials represent a set of data transmitted in the process of authentication to an authority.

They contain an identifier for the client and a proof of the client's identity, such as a password.

They may also include information, such as a signature, to indicate that the issuer certifies the claims in the credential.