Question: Suppose Eve has learned that Bob is using a Vigenere cipher with keyword length m < 12, and she has been able to apply a

Suppose Eve has learned that Bob is using a Vigenere cipher with keyword length m < 12, and she has been able to apply a chosen-plaintext attack to learn that the plaintext "AAAAAAAA'' has "BCDEBCDE'' as its ciphertext. What are the possible values for m?

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