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(1) (Chosen ciphertext attack for affine cipher.) Choose AB for the ciphertext. This gives Q10 +B=0 (mod 26) 2204 +B=1 (mod 26) for some 21,

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(1) (Chosen ciphertext attack for affine cipher.) Choose AB for the ciphertext. This gives Q10 +B=0 (mod 26) 2204 +B=1 (mod 26) for some 21, 02. Solve for (x,B

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