Question: Problem 11 (4 Points): Let E(K, :) be a block cipher. Assume that the block length is l bits and that key K is of

Problem 11 (4 Points): Let E(K, :) be a block cipher.

Problem 11 (4 Points): Let E(K, :) be a block cipher. Assume that the block length is l bits and that key K is of n bits. How many keys on the average encrypt a particular plaintext block to a particular ciphertext block? Problem 12 (6 Points): Calculate the following quantities by hand. Detail your steps. (a) 203243 mod 99 (b) 491213 mod 21

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