Require (a, 26) to be coprime in affine encode #1788
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That's really cool to learn about, thanks for the improvement to the operation! |
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The affine multiplier is checked to be coprime to 26 in affine decode, but not encode, so this PR address that. It doesn't make sense to allow non-coprime values in the cipher, as the resulting ciphertext is invalid and unable to be decoded.