Question: Suppose that we have a linear block cipher E that encrypts 128-bit blocks of plaintext into 128-bit blocks of ciphertext. Let Ek(m) denote the ciphertest

Suppose that we have a linear block cipher E that encrypts 128-bit blocks of plaintext into 128-bit blocks of ciphertext. Let Ek(m) denote the ciphertest of a 128-bit message m under a key k. Thus, for messages m1 and m2, we have

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