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

Enter the key cube below and select the reading order of the cube. There are different methods in use and therefore all the options are available here. Finally select encryption or decryption and enter the text to convert it.

Key cube:
Use standard cube (with key):
Use manual or random cube:
Select reading order:

In classical cryptography, the trifid cipher is a cipher invented around 1901 by Felix Delastelle, which extends the concept of the bifid cipher to a third dimension, allowing each symbol to be fractionated into 3 elements instead of two. That is, while the bifid uses the Polybius square to turn each symbol into coordinates on a 5 x 5 square, the trifid turns them into coordinates on a 3 x 3 x 3 cube. As with the bifid, this is then combined with transposition to achieve diffusion. However a higher degree of diffusion is achieved because each output symbol depends on 3 input symbols instead of two. Thus the trifid was the first practical trigraphic substitution.

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  Last update: 12-29-2023
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