Assume a message m is encrypted using the Shift cipher and the resulting ciphertext is as follows:

TEBKFKQEBZLROPBLCERJXKBSBKQP

What would be the values of m and key k in this case? Assume that encryption and decryption in the shift cipher are dened as ci = (mi k) mod 26 and mi = (ci + k) mod 26, respectively. Here mi and ci denote the ith character in message m and ciphertext c, respectively. Please justify your answer. (Hint: you need to do an exhaustive search or brute force attack over 26 possible keys.)

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