Question: Problem 4: Suppose you have a language with only three letters a, b,c, and they occur with frequencies 0.7,0.2,0.1, respectively. The following ciphertext was encrypted

Problem 4: Suppose you have a language with only three letters

Problem 4: Suppose you have a language with only three letters a, b,c, and they occur with frequencies 0.7,0.2,0.1, respectively. The following ciphertext was encrypted by the Vigenre method (the arithmetic is them modulo 3, not moduo 26): ABCBABBBAC. Suppose you know the key length is 1, 2 or 3. Show that the key length is probably 2, and determine the most probable key

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