Security Protocols I - Information Security
Security Protocols I - Information Security
Security Protocols I - Information Security
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Sebastian Mödersheim 32Summary: Messages• Message notation (examples):Roles: A, B or Alice, BobAgents: a, b, iSymmetric Keys: K, K AB , . . . ; sk(A, S)Symmetric Encryption: {|M|} KPublic Keys: K, pk(A)Private Keys: inv(K), inv(pk(A))Asymmetric Encryption: {M} KSigning: {M} inv(K)Nonces: NA, N1 fresh data items used for challenge/response.N.B.: sometimes subscripts are used, e.g. N A , but it does not mean thatprincipals can find out that N A was generated by A.Timestamps: T . Denote time, e.g. used for key expiration.Message concatenation: M 1 , M 2 , M 3FMSEC Module 2, v.2 28.09.2009
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