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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.
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.
Atbash is a cipher that maps each letter to its reverse in the alphabet, such as A to Z and B to Y. It is used to encrypt the Hebrew alphabet and has no security, as it lacks a key.
Affine cipher is a type of monoalphabetic substitution cipher that uses modular arithmetic to encrypt and decrypt letters. Learn the formula, the weaknesses, and an example of affine cipher with a = 5 and b = 8.
Learn how to use the alphabet to send encrypted codes with the Alphabet Cipher, a polyalphabetic cipher invented by Lewis Carroll in 1868. See an example of how to encode and decode a message using a key-word.
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.
Bacon's cipher is a steganographic method of encoding a message in the presentation of text, using groups of five letters 'A' or 'B'. Learn how it works, see examples and explore its connection to Francis Bacon and Shakespeare.
The tap code is based on a Polybius square using a 5×5 grid of letters representing all the letters of the Latin alphabet, except for K, which is represented by C. . Each letter is communicated by tapping two numbers, the first designating the row and the second (after a pause) designating the column.
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