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P2P Grouping implements Group Security, which is a Graph Security Provider [MS-PPGRH]. Group Security provides two classes of security features: connection security and record security.
Connection security is implemented by the Group Connect subprotocol (see section 1.3.3), which provides authentication and message encryption within a connection secured by TLS [RFC4346].
Record security provides authorization and record integrity, by implementing record validation and record signing.
P2P Grouping adds publication and discovery of nodes by way of Peer Name Resolution Protocol (PNRP, as specified in [MS-PNRP]). When attempting to connect to a group, P2P Grouping uses Peer Name Resolution Protocol (PNRP) to find an existing group member. When a node begins listening for connections from other group members, it publishes itself using PNRP. PNRP is also queried periodically when P2P Graphing notifies P2P Grouping that a new connection is to be formed to repair undetected long-term partitions.