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#Nihilist Cipher

2 articles with this tag.

A visual representation of index-of-coincidence period finding and column key recovery against the Nihilist cipher
Basic Classic Symmetric Breakers Intermediate

Breaking the Nihilist Cipher

The Nihilist cipher turns letters into Polybius numbers and adds a repeating keyword, which makes it a Vigenere cipher wearing a numeric disguise. Index of coincidence finds the period, and column-by-column statistics peel off the key. This guide runs the real attack and recovers a 514-letter message.

13 min read

A visual representation of the Nihilist Cipher
Basic Classic Symmetric Intermediate

The Nihilist Cipher

Learn about the Nihilist cipher, the 19th-century Russian revolutionary cipher that turns a Polybius square into a polyalphabetic system by adding coordinate numbers together instead of shifting letters.

13 min read

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