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

(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 8a + B = 15 (mod 26) 6& + B = 16 (mod 26) Solve this in modular arithmetic to get the keys

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