Add affine cipher exercise #2787
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| The encryption function is: | ||
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| ```text | ||
| E(x) = (ai + b) mod m |
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From mathematical notation this is weird. E(x) means that this is a function called E that depends on the variable x. But there is no x in the calculation. (a, b, m are mathematically considered constants here and don't need to be mentioned.)
I think it should be E(i) or i changed to x in the function.
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This is something that would need to be fixed upstream, in the prob-specs repo.
| The decryption function is: | ||
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| ```text | ||
| D(y) = (a^-1)(y - b) mod m |
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