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Consider the mathematical formalization of encryption and decryption. If the message space is {a, b, c, d, e} and the ciphertext space is {1, 2,

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Consider the mathematical formalization of encryption and decryption. If the message space is {a, b, c, d, e} and the ciphertext space is {1, 2, 3, 4, 5}. What is the size of the key space? Write a number

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