Question: 10 Prob 3.18 a. This method is not secure. b. If Alice encrypts plaintext one letter at a time, then the same letter will have

10 Prob 3.18 a. This method is not secure. b. If Alice encrypts plaintext one letter at a time, then the same letter will have the same ciphertext. The attacker can figure out letter frequencies to decrypt the cipertext. c. The Hamming distence between every two adjacent letters is 1, which makes it easy for attacker to carry out cryptoanalysis. d. None of the above. e. All a, b, and c

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