Network security: Protocol reference model and the trusted computer system evaluation criteria

Issues arising from the application of the Trusted Computer System Evaluation Criteria (TCSEC) to networks are discussed, particularly those requiring further research. The focus is on how to integrate many of the concepts in the Open Systems Interconnection (OSI) security addendum into the framework of the TCSEC. The discussion covers the protocol architectural issues of the trusted network with particular emphasis on the relationship among network protocols, protocol reference model, and network security. It is argued that application of the TCSEC to computer networks requires incorporation of a network protocol reference model as implemented in a protocol suite.