Famous Unsolved Codes and Ciphers
Unofficial list of well-known unsolved codes and ciphers, from the Beale Ciphers to the Richard Feynman Challenge. Also include untranslated ancient scripts like Linear A.
Step-by-step overview of ciphers and substitution codes for the amateur secret agent. Learn about cipher wheels and diagrams, transpositions, and frequencies.
Codes and Ciphers
Essay about the use of ciphers and codes to disguise secret messages throughout history. Learn about the Caesar Substitution Cipher, polyalphabetic substitution, and World War II's Enigma machine.