it's a bit unclear why padding is necessary in the first two test cases, where the number of characters (15) is already a multiple of the key size (3 or 5, respectively)
Distance walked 1D
Make an awesome ramp for a tiny motorcycle stuntman
Flip the main diagonal of a matrix
Decode a simplified barcode
Dealing with correlation results!
Cryptography with A Square Matrix : Decoding
'5*3' copy character 3 - five times
Hexagonal numbers on a spiral matrix
Homemade: Control Charts
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