Some tools are affected by an update and do not function properly or result in error messages. I'm looking into it.
Known issues: Coordinate conversion (errors for some conversions).
Gronsfeld cipher

Enter the numeric key and the text below and choose between encrypting and decrypting.


The Gronsfeld cipher is, just like the Vigenère cipher a polyalphabetic substitution. Characters are replaced using different alphabetic series and a key word is used for the encryption. The only difference is that the Gronsfeld cipher uses a numeric key. The Gronsfeld cipher can easily be converted to a Vigenère cipher by substitution of the key: 0=>a, 1=>b, ..., 9=>j.

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  Last update: 12-29-2023
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