There are three typical ways to use nonces as challenges Suppose N a is a nonce generated by A, A and B share key K, and f() is a function (such as an increment) The three usages are Describe situations for which each usage is appropriate Usage 1 (1) AB Na (2) BA E(K, N) Usage 2 (1) AB E(K, N) (2) B A Na Usage 3 (1) AB E(K, N) (2) BA E(K, f(Na))

Question: There are three typical ways to use nonces as challenges. Suppose N a is a nonce generated by A, A and B share key K,

There are three typical ways to use nonces as challenges. Suppose N_a is a nonce generated by A, A and B share key K, and f() is a function (such as an increment). The three usages are Usage 1 (1) AB: Na (2) BA: E(K, N) Usage 2 (1)

Describe situations for which each usage is appropriate.

Usage 1 (1) AB: Na (2) BA: E(K, N) Usage 2 (1) AB: E(K, N) (2) B A: Na Usage 3 (1) AB: E(K, N) (2) BA: E(K, f(Na))

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