Question: Suppose that E : {0,1}x{0,1} > {0, 1} is an nbit block Cipher, e.g., c = Ek(m), k, m, c 6 {0,1}. When It is

Suppose that E : {0,1}"x{0,1}\" > {0, 1}\" is an nbit block Cipher, e.g., c = Ek(m), k, m, c 6 {0,1}". When It is xed, EkO is a permutation. Using the block cipher E, we construct a hash function h : {0,1}3" > {0,1}" as: h(5) = Em (332 /\\ 133), where the message a: E {0,1}3\" with as = $1||x2||w3, 931,332,$3 6 {0,1}\

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