Have got absorbed by the National Cipher Challenge.  Not sure what this animation varying the multiplier in an ‘Affine Shift’ add 5.  Functional grid shows transition from Caesar Shift 5, multiply by 1, through to multiply by 13, which is a useless cipher.  In fact any multiplier not co-prime with 26 can be seen to be …

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Have been playing with Python to work on the National Cipher Challenge.  The string function translate seems to be tailor made for this sort of thing.