Question: (2) (Known plaintext attack for affine cipher.) Suppose the plaintext starts with if and the corresponding ciphertext is PQ. This means (8,5) > (15,16). This

(2) (Known plaintext attack for affine cipher.) Suppose the plaintext starts

(2) (Known plaintext attack for affine cipher.) Suppose the plaintext starts with if and the corresponding ciphertext is PQ. This means (8,5) > (15,16). This gives the simultaneous equations 80+ B = 15 (mod 26) 60+ B = 16 (mod 26) Solve this in modular arithmetic to get the keys a = 17,B = 9

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