Answer (Choose 3 answers)
A product cipher comprised of Caesar Cipher and Permutation Cipher (with a key of length 1 encrypt a long English book (ignoring capitalization and other symbols beyond English letters following statements are correct?
A. Letter Z appeared the most in the ciphertext, so it must be mapped from the latter E
B. The letter-pair/digram AX appeared the most in the ciphertext, so they must be TH. In other words. A is mapped from the letter T. and X is mapped from H.
C. If we replace the Caesar Cipher with a Monoalphabetic Cipher, then it becomes harder to crack by an attacker (who does not know the key).
D. If we another Caesar Cipher encryption in the product cipher (so that there are two Caesar Cipher operations and a Permutation Cipher operation), then it becomes harder to crack by an attacker (who does not know the key)
E. The ordering between the Caesar and the Permutation does not matter within the product cipher, so we can decrypt it in any order.
FUO cute
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