1. In this question, we will use the following notations: PU and PR are the Public...
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1. In this question, we will use the following notations: PU and PR are the Public and its [M]K : message M is decrypted with K. corresponding Private keys. K is a symmetric Key. {M}PU: message M is encrypted/verified with P. M is a Message and C is the corresponding Cipher [M]PR: message M is decrypted/signed with PR. {M}K: message M is encrypted with K. H(M): the hash of message M. Assume that Bob and Alice agree on a shared secret K. Bob wants to authenticate himself to Alice using any of the following methods: (a) Bob sends Alice: C= K{K} (b) Bob sends Alice: C= {K }PU-Alice (c) Bob sends Alice: C= H(K) (d) Bob sends Alice: C={H(K)} PR-Bob (e) Bob sends Alice: C={{K} PU-Alice } PR-Bob In each method, describe what Alice should do (compute) when she receives C in order to authenticate Bob. 1. In this question, we will use the following notations: PU and PR are the Public and its [M]K : message M is decrypted with K. corresponding Private keys. K is a symmetric Key. {M}PU: message M is encrypted/verified with P. M is a Message and C is the corresponding Cipher [M]PR: message M is decrypted/signed with PR. {M}K: message M is encrypted with K. H(M): the hash of message M. Assume that Bob and Alice agree on a shared secret K. Bob wants to authenticate himself to Alice using any of the following methods: (a) Bob sends Alice: C= K{K} (b) Bob sends Alice: C= {K }PU-Alice (c) Bob sends Alice: C= H(K) (d) Bob sends Alice: C={H(K)} PR-Bob (e) Bob sends Alice: C={{K} PU-Alice } PR-Bob In each method, describe what Alice should do (compute) when she receives C in order to authenticate Bob.
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