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In cryptography, security (engineering) protocol notation, also known as protocol narrations and Alice & Bob notation, is a way of expressing a protocol of correspondence between entities of a dynamic system, such as a computer network. In the context of a formal model, it allows reasoning about the properties of such a system. The standard notation consists of a set of principals (traditionally named Alice, Bob, Charlie, and so on) who wish to communicate. They may have access to a server S, shared keys K, timestamps T, and can generate nonces N for authentication purposes. A simple example might be the following: : This states that Bob intends a message for Alice consisting of a nonce NB encrypted using public key of Alice. A key with two subscripts, KA,B, is a symmetric key shared by the two corresponding individuals. A key with one subscript, KA, is the public key of the corresponding individual. A private key is represented as the inverse of the public key. The notation specifies only the operation and not its semantics — for instance, private key encryption and signature are represented identically. We can express more complicated protocols in such a fashion. See Kerberos as an example. Some sources refer to this notation as ''Kerberos Notation''.〔 〕 Some authors consider the notation used by Steiner, Neuman, & Schiller〔 〕 as a notable reference. 〔 〕 Several models exist to reason about security protocols in this way, one of which is BAN logic. == References == 〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Security protocol notation」の詳細全文を読む スポンサード リンク
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