AMSCO Cipher

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Let's look at the AMSCO cipher. This is a positional cipher with exchanges. You can easily encode or decode a message with a pen and paper, that is of course, if you know the key.

The key is represented as a number that consist of unique digits from 1 to N. N is a length of the key. To encode message we should write a message in a matrix with N columns. The matrix is written row by row. In this process, one or two characters are alternately recorded in a field. One or two characters alternate in rows and in columns too (like...

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