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Learn about the history, variations and insecurity of the pigpen cipher, a geometric simple substitution cipher that uses symbols in a grid. The cipher is also known as the masonic cipher, Rosicrucian cipher, Napoleon cipher and tic-tac-toe cipher.
The Copiale cipher is a 1730s encrypted manuscript by a German oculist order, or Oculists, who used sight as a metaphor for knowledge. The cipher was decrypted in 2011 with computer assistance and reveals an initiation ceremony and a connection to Freemasonry.
A Caesar cipher is a simple encryption technique that shifts each letter in the plaintext by a fixed number of positions in the alphabet. Learn about its history, usage, examples, and variations, such as the Vigenère cipher and the ROT13 system.
Learn how pedophiles use symbols and logos to identify their sexual preferences and advertise their cause. See images of the symbols and codes for boylove, girllove, childlove and non-preferential ...
A cipher is an algorithm for encrypting or decrypting information, while a code is a set of symbols or words that stand for other meanings. Learn about the origin, classification and examples of ciphers, from ancient to modern, and how they differ from codes.
A substitution cipher is a method of encrypting in which units of plaintext are replaced with ciphertext, using a key. A monoalphabetic cipher uses fixed substitution over the entire message, while a polyalphabetic cipher uses multiple substitutions at different positions.
Learn how to encrypt and decrypt visual information (pictures, text, etc.) using transparencies or opaque sheets. Visual cryptography is a cryptographic technique that allows visual images to be encrypted in such a way that the decrypted information appears as a visual image.
Kryptos is a sculpture by Jim Sanborn at the CIA headquarters that contains four coded messages, three of which have been solved. The fourth message is one of the most famous unsolved codes in the world and has four clues provided by the artist.