Classical Ciphers

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CONFIGURATION
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Valid a values: 1 3 5 7 9 11 15 17 19 21 23 25
Encrypts letter pairs. Non-alpha chars are removed. Output is uppercase digraphs.
Columns are read in alphabetical order of the key. Output columns are separated by |
Digraph cipher. Output is uppercase letter pairs.
Ctrl+E  Encipher    Ctrl+D  Decipher    Ctrl+R  Reset
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