Question: You are given two affine ciphers for which encryption is described by this pair of formulae: y = 5 x + 1 2 ( m

You are given two affine ciphers for which encryption is described by this pair of formulae: y=5x+12
(mod26)y=11x+23(mod26)
Write down the equivalent single encryption formula when encrypting with the first formula and then
the second formula. It will be in the form y=x+(mod26) where 0,25.
Show that each of the ciphertexts ZOMCIH and ZKNGZR, which were obtained by shift
ciphers from one-word plaintexts, has two different decryptions.
e 4. The ciphertext JLH was obtained by affine encryption with the function 9x+1mod26. Find
the plaintext.

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