3.1.1 Abstract Data Model
This section describes a conceptual model of possible data organization that an implementation maintains to participate in this protocol. The described organization is provided to facilitate the explanation of how the protocol behaves. This document does not mandate that implementations adhere to this model as long as their external behavior is consistent with that described in this document.
The abstract data model follows what is specified in [RFC2617] and [RFC2831]. In addition, there is the following variable:
Integrity: When this value is set, it indicates that the higher-layer protocol requires integrity in addition to simple authentication. This corresponds to the auth-int option, as specified in [RFC2617] sections 3.2.1 and 3.2.2. If this is not set, only auth is specified as the requested quality of protection.