Authentication/Key Distribution (2+4+2+2) Consider the following protocol for Authentication/Key…
Authentication/Key Distribution (2+4+2+2) Consider the following protocol for Authentication/Key Distribution: (X and Y are two nodes, A is a CA/KDC, N, and N2 are random numbers, and Ex means encrypted with the secret key of X.) 1. X+A: X, Y, N1 2. AX: Ex(N1, X, Y, K, Ey(K, X)) 3. XY: Ey(K, X) 4. YX: EK(N2) 5. XY: EK(N2 – 1) 1. What is purpose of N, in message 2? 2. Show that if an attacker were to break an old K, he/she can impersonate user X to user Y. 3. How to solve this problem? 4. What is the purpose of Steps 4 and 5?
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