Express the Vigenère cipher as a cryptosystem.To break a
Chapter 4, Problem 20E(choose chapter or problem)
Problem 20E
Express the Vigenère cipher as a cryptosystem.
To break a Vigenère cipher by recovering a plaintext message from the ciphertext message without having the key. the first step is to figure out the length of the key string. The second step is to figure out each character of the key string by determining the corresponding shift. Exercises 21 and 22 deal with these two aspects.
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