Consider the following protocol with the two roles C and KAS and the two public functions...

Transcribed Image Text:

Consider the following protocol with the two roles C and KAS and the two public functions pk(_) and sigk(_): Step 1: C KAS : {C, pk(C), sigk(C)}inv(sigk(s)), {Tc, N2}inv(sigk(C)) Step 2: KAS →→→C: {{KAS, pk (KAS), sigk(KAS)} inv(sigk(s)), {K, N2}inv(sigk(KAS))} pk(C) - State whether the protocol transmits the key K securely (i.e., secretly and authentically) from KAS to C. If it is secure, explain why. If it is not secure, explain the possible attack and briefly explain a possible fix. Consider the following protocol with the two roles C and KAS and the two public functions pk(_) and sigk(_): Step 1: C KAS : {C, pk(C), sigk(C)}inv(sigk(s)), {Tc, N2}inv(sigk(C)) Step 2: KAS →→→C: {{KAS, pk (KAS), sigk(KAS)} inv(sigk(s)), {K, N2}inv(sigk(KAS))} pk(C) - State whether the protocol transmits the key K securely (i.e., secretly and authentically) from KAS to C. If it is secure, explain why. If it is not secure, explain the possible attack and briefly explain a possible fix.

Answer rating: 100% (QA)

Yes the protocol in the image transmits the key K securely ie secretly and authentically from KAS to ... View the full answer