A simple protocol - 1 A B rB || Are you OK? rB || Yes, I’m OK

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Presentation transcript:

A simple protocol - 1 A B rB || Are you OK? rB || Yes, I’m OK MACK ( rB || Yes, I’m OK ) Introduction to Cryptography and Security Mechanisms 2005

A simple protocol - 2 A B Are you OK? Bob || Yes, I’m OK SigA ( Bob || Yes, I’m OK ) Introduction to Cryptography and Security Mechanisms 2005

A simple protocol - 3 A B rB || Are you OK? rB || Bob || Yes, I’m OK SigA ( rB || Bob || Yes, I’m OK ) Introduction to Cryptography and Security Mechanisms 2005

A simple protocol - 4 A B TB || Are you OK? TB || Bob || Yes, I’m OK MACK ( TB || Bob || Yes, I’m OK ) Introduction to Cryptography and Security Mechanisms 2005

A simple protocol - 5 A B Are you OK? Bob || Yes, I’m OK MACK ( TA || Bob || Yes, I’m OK ) Introduction to Cryptography and Security Mechanisms 2005

A simple protocol - 6 A B TB || Are you OK? TA || TB || Bob || Yes, I’m OK MACK ( TA || TB || Bob || Yes, I’m OK ) Introduction to Cryptography and Security Mechanisms 2005