Question: Exercise 2 (2 pts). A message M is encrypted using multiple applications of the Caesar cipher. That is, the Caesar cipher is used to encrypt

Exercise 2 (2 pts). A message M is encrypted using multiple applications of the Caesar cipher. That is, the Caesar cipher is used to encrypt M into the ciphertext C1, then C1 is encrypted into C2 using the Caesar cipher again, then C2 is encrypted into C3 similarly, and so on. It turned out that the ciphertext Ck obtained using k such applications is identical to the plaintext M. What is k?

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