9.18 The problem illustrates a simple application of the chosen ciphertext attack. Bob intercept - Solutions Cryptography and Network Security principles an practice

9.18 The problem illustrates a simple application of the chosen ciphertext attack. Bob intercepts a ciphertext C intended for Alice and encrypted with Alice"s public key e. Bob want to obtain the original message M = Cd mod n. Bob chooses a random value r less than n and computes Z = re mod n X = ZC mod n t = r1 mod n Next, Bob gets Alice to authenticate (sign) X with her private key (as in Figure 9.3), thereby decrypting X. Alice returns Y = Xd mod n. Show how Bob can use the information now available to him to determine M.


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Solupals - Textbook Solutions Solutions Cryptography and Network Security principles an practice - 4th edition- William Stallings