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  2. 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 ...

  3. 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.

  4. Trifid cipher - Wikipedia

    en.wikipedia.org/wiki/Trifid_cipher

    The trifid cipher is a classical cipher invented by Félix Delastelle and described in 1902. [1] Extending the principles of Delastelle's earlier bifid cipher, it combines the techniques of fractionation and transposition to achieve a certain amount of confusion and diffusion: each letter of the ciphertext depends on three letters of the plaintext and up to three letters of the key.

  5. ROT13 - Wikipedia

    en.wikipedia.org/wiki/ROT13

    To decode a message, You apply the same substitution rules, but this time on the ROT13 encrypted text. (Any other character, for example numbers, symbols, punctuation or whitespace, are left unchanged.) Because there are 26 letters in the Latin alphabet and 26 = 2 × 13, the ROT13 function is its own inverse: [2]

  6. Two-square cipher - Wikipedia

    en.wikipedia.org/wiki/Two-square_cipher

    Other slight variants, also incorporating seriation, are described in Schick (1987) [10] and David (1996). [11]The two-square cipher is not described in some other 20th century popular cryptography books e.g. by Helen Fouché Gaines (1939) or William Maxwell Bowers (1959), although both describe the Playfair cipher and four-square cipher.

  7. Phonetic reversal - Wikipedia

    en.wikipedia.org/wiki/Phonetic_reversal

    However, if one reverses it, it says, "Three Letters Back", which is a clue to the ending credits code. The whisper is changed to "Switch the A with Z" in Double Dipper, "26 Letters" in Bottomless Pit, "Key Vigenere" in Scary-Oke, and "Not What He Seems" in the episode with this title (while still using the Vigenere cipher ).

  8. List of Gravity Falls episodes - Wikipedia

    en.wikipedia.org/wiki/List_of_Gravity_Falls_episodes

    Disney commissioned Hirsch to create an eleven-minute low-budget animated pilot [2] for Gravity Falls which he later described as "a short version of Tourist Trapped". [9] On December 9, 2010, it was announced that Disney Channel had greenlit Gravity Falls for a full series based on the pilot, which was originally slated to premiere in spring ...

  9. Running key cipher - Wikipedia

    en.wikipedia.org/wiki/Running_key_cipher

    Decryption requires mapping the words back to ASCII, and then decrypting the characters to the real plaintext using the running key. Nested-BDA will run the output through the reencryption process several times, producing several layers of "plaintext-looking" ciphertext - each one potentially requiring "human-in-the-loop" to try to interpret ...