Search results
Results From The WOW.Com Content Network
Tap code, also called knock code, is a simple method of communicating letters using a 5x5 grid of letters. It is often used by prisoners to send messages to each other, and has a history dating back to ancient Greece.
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.
A book cipher is a cipher in which each letter or word of the plaintext is replaced by a code that locates it in another text, the key. Learn about the history, security, and examples of book ciphers, such as the Beale ciphers and the Cicada 3301 mystery.
Leet is a system of modified spellings used by hackers, crackers, and online gamers to express skill or accomplishment. It often uses character replacements, suffixes, and alternative meanings, and has many dialects and memes.
The web page lists the code names used by the U.S. Secret Service for presidents, first ladies, and other prominent persons and locations. Donald Trump and his family members have the code names Mogul, Muse, Mountaineer, Marvel, Marksman, and Mechanic.
The Enigma machine was a cipher device used by Nazi Germany and other countries to protect secret messages. Learn how it worked, how it was broken by Poland, France, and Britain, and how it influenced World War II.
A code name is a secret word or phrase used to refer to something or someone. Learn about the origins and uses of code names in military, espionage, business and other contexts, with examples from World War I, World War II and beyond.
Learn about symmetric-key encryption, which uses the same key for both encryption and decryption. Compare stream ciphers and block ciphers, and see examples of popular symmetric-key algorithms and their security features.