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#ADFGVX Cipher

2 articles with this tag.

A visual representation of recovering the ADFGVX transposition and substitution to decrypt a message

Basic Classic Symmetric Breakers Advanced

Breaking the ADFGVX Cipher

ADFGVX fractionates each letter into two symbols and then shuffles them with a columnar transposition, the combination that made it Germany's toughest field cipher of 1918. This guide runs the modern automated attack: recover the transposition with the index of coincidence, then solve the substitution with quadgrams, and read a 330-letter message back out.

Oct 30, 2026 14 min read

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.

Aug 21, 2026 14 min read

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