Generally, we know that substitution ciphers do not have the property of diffusion. And affine ciphers is the special case of substitution ciphers. But how can we prove that affine cipher does not satisfy the diffusion property?
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It will depend on how you define diffusion formally. So please state how you define it. – Henno Brandsma Mar 17 '15 at 21:18
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Diffusion property says that one change character in plaintext should affect as many characters as possible in cipher text. – express78 Mar 19 '15 at 14:44