Definition of entity authentication

Authentication is considered a pre-requisite for communication security, but the definition of authentication is generally not agreed upon. Many attacks on authentication protocols are the result of misunderstanding of the goals of authentication. This state of affairs indicate limitations in theoretical understanding of the meanings of authentication. We provide a new insight in this direction and formalize it in CFPS (Common Framework for authentication Protocols' Specifications). CFPS provides a precise scope of definition for authentication protocols, which could make the design and analysis process more systematic.