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#Fractionation

Found 2 articles with this tag.

A visual representation of the ADFGVX Cipher
Basic Classic Symmetric Advanced

The ADFGVX Cipher

Learn about ADFGVX, the German WWI field cipher that combined Polybius-square fractionation with columnar transposition. It was considered so strong that French cryptanalyst Georges Painvin needed weeks to break a message that helped stop a 1918 offensive.

A visual representation of the Bifid Cipher
Basic Classic Symmetric Advanced

The Bifid Cipher

Learn about the Bifid cipher, Félix Delastelle's fractionating cipher that scrambles a Polybius square's coordinates across an entire message, defeating single-letter frequency analysis far more thoroughly than plain substitution.