Decrypt the message EABW EFRO ATMR ASIN which is the ciphertext produced by encrypting a plaintext message using the transposition cipher with blocks of four letters and the permutation ? of {1, 2, 3, 4} defined by ?(1) = 3, ?(2) = 1, ?(3) = 4. and ?(4) = 2.

Leslie Ogu CSCI 4531 09/20/2016 Chapter 20 Continued Type of Attack Known to Cryptanalyst Ciphertext only ● Encryption algorithm ● Ciphertext to be decoded Known plaintext ● Encryption algorithm ● Ciphertext to be decoded ● One or more plaintextciphertext pairs formed with the secret key Chosen plaintext ● Encryption algorithm ● Ciphertext to be decoded ● Plaintext message chosen by cryptanalyst,