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Bifid cipher

Enter the key square below and select encryption or decryption. Enter the text to convert it.
Since we can only use 25 characters in the key square, there is a possibility to choose which letter to substitute by another letter (by default J is substituted by I) or to omit a letter.

Key square:
Use standard square (with key):
Use manual or random square:
Replace a letter: Replace by
Skip a letter: Skip:
Method:
Background

The bifid cipher is one of the classical ciphers and was invented around 1901 by Felix Delastelle. Bifid is a combination of substitution and fractionation, this causes the original text to spread over the entire encrytion, which is more secure.

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