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  2. Polyalphabetic cipher - Wikipedia

    en.wikipedia.org/wiki/Polyalphabetic_cipher

    The second letter of the message was enciphered using the second shifted alphabet, etc. Alberti's cipher disk implemented the same scheme. It had two alphabets, one on a fixed outer ring, and the other on the rotating disk. A letter is enciphered by looking for that letter on the outer ring, and encoding it as the letter underneath it on the disk.

  3. Music cipher - Wikipedia

    en.wikipedia.org/wiki/Music_cipher

    Motivic music cipher by Johann Bücking (1804) In a compound substitution cipher, each single plaintext letter is replaced by a block of multiple cipher symbols (e.g., 'a' = EN or 'b' = WJU). Similarly, there are compound music ciphers in which each letter is represented by a musical motive with two or more notes.

  4. Musical cryptogram - Wikipedia

    en.wikipedia.org/wiki/Musical_cryptogram

    A musical cryptogram is a cryptogrammatic sequence of musical symbols which can be taken to refer to an extra-musical text by some 'logical' relationship, usually between note names and letters. The most common and best known examples result from composers using musically translated versions of their own or their friends' names (or initials) as ...

  5. Substitution cipher - Wikipedia

    en.wikipedia.org/wiki/Substitution_cipher

    At the end of every season 1 episode of the cartoon series Gravity Falls, during the credit roll, there is one of three simple substitution ciphers: A -3 Caesar cipher (hinted by "3 letters back" at the end of the opening sequence), an Atbash cipher, or a letter-to-number simple substitution cipher. The season 1 finale encodes a message with ...

  6. Caesar cipher - Wikipedia

    en.wikipedia.org/wiki/Caesar_cipher

    In cryptography, a Caesar cipher, also known as Caesar's cipher, the shift cipher, Caesar's code, or Caesar shift, is one of the simplest and most widely known encryption techniques. It is a type of substitution cipher in which each letter in the plaintext is replaced by a letter some fixed number of positions down the alphabet .

  7. ROT13 - Wikipedia

    en.wikipedia.org/wiki/ROT13

    ROT13 is a simple letter substitution cipher that replaces a letter with the 13th letter after it in the Latin alphabet. ROT13 is a special case of the Caesar cipher which was developed in ancient Rome, used by Julius Caesar in the 1st century BC. [1] An early entry on the Timeline of cryptography.

  8. Game of the Day: Letter Linker - AOL

    www.aol.com/news/2011-03-09-game-of-the-day...

    The game of the day wants to keep your mind sharp. Letter Linker is a Games.com classic. Link the letters on the board to make words just like you used to do in the newspaper. This game requires ...

  9. Aristocrat Cipher - Wikipedia

    en.wikipedia.org/wiki/Aristocrat_Cipher

    The Aristocrat Cipher is a type of monoalphabetic substitution cipher in which plaintext is replaced with ciphertext and encoded into assorted letters, numbers, and symbols based on a keyword. The formatting of these ciphers generally includes a title, letter frequency, keyword indicators, and the encoder's nom de plume . [ 1 ]