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Sequenced Methods Generic Model Client Authentication Agent 1 Authentication Agent 2 Protocol Sequence 1 Client AND/OR Server Authentication Protocol Sequence 2 Client AND/OR Server Authentication Front-end authenticator Authentication Server Protocol Sequence N Client AND/OR Server Authentication …. … Session Keys (Which method ?) Ciphered Link Terminology ”Front-end” authenticator is end of access link to be authenticated Intermediate endpoint in sequence is an authentication ”agent” Final authentication endpoint is authentication ”server” Agents and Server may be co-located. |