Known issues: Coordinate conversion (errors for some conversions).

ADFGX / ADFGVX cipher

Choose the cipher type and complete the key square, either manually or choose a random square. Double letters/numbers will not be accepted and in the case of the ADFGX cipher the J will be rejected, use the I instead.

Finally enter the key word and choose either encrypt or decrypt.

Background

The ADF(V)GX cipher uses a key square with the letters of the alphabet. In case of the ADFGX cipher (the original cipher) the J is not used and replaced by the I, so the alphabet fits into the 5 x 5 square. In case of the extended ADFVGX cipher the square is completed by using the full alphabet and the digits 0 to 9.

Next every letter in the plain text is replaced by the combination of two of the ADF(V)GX letters using the key square. These combinations are positioned beneath the key word in rows. The rows are then alphabetically sorted by the key word and read vertically. This is how the encrypted text is found.

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