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  2. Cryptogram - Wikipedia

    en.wikipedia.org/wiki/Cryptogram

    Occasionally, cryptogram puzzle makers will start the solver off with a few letters. A printed code key form; the alphabet with a blank under each letter to fill in the substituted letter, is usually not provided but can be drawn to use as a solving aid if needed. Skilled puzzle solvers should require neither a code key form nor starter clue ...

  3. 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]

  4. Substitution cipher - Wikipedia

    en.wikipedia.org/wiki/Substitution_cipher

    A block of n letters is then considered as a vector of n dimensions, and multiplied by a n x n matrix, modulo 26. The components of the matrix are the key, and should be random provided that the matrix is invertible in (to ensure decryption is possible). A mechanical version of the Hill cipher of dimension 6 was patented in 1929.

  5. List of ciphertexts - Wikipedia

    en.wikipedia.org/wiki/List_of_ciphertexts

    The Magic Words are Squeamish Ossifrage: Solved in 1993–1994 1983 Decipher: Solved [1] 1986 Decipher II: Partially solved (all 4 ciphertexts solved between 1985 and 1986, but the solution to the 4th ciphertext has since been lost) [2] 1987 Decipher III: Unsolved [2] 1990 Kryptos: Partially solved (3 out of the 4 ciphertexts solved between ...

  6. Alberti cipher - Wikipedia

    en.wikipedia.org/wiki/Alberti_cipher

    The key letters A and Q are included in the cryptogram. The small letter a resulting from the encipherment of the number 2 is a null and must be discarded in the decipherment. After enciphering a few letters a different uppercase letter (Q) is inserted in the cryptogram and the movable disk is accordingly rotated obtaining a new combination:

  7. American Cryptogram Association - Wikipedia

    en.wikipedia.org/wiki/American_Cryptogram...

    The American Cryptogram Association (ACA) is an American non-profit organization devoted to the hobby of cryptography, with an emphasis on types of codes, ciphers, and cryptograms that can be solved either with pencil and paper, or with computers, but not computer-only systems.

  8. Beaufort cipher - Wikipedia

    en.wikipedia.org/wiki/Beaufort_cipher

    Due to the similarities between the Beaufort cipher and the Vigenère cipher it is possible, after applying a transformation, to solve it as a Vigenère cipher. By replacing every letter in the ciphertext and key with its opposite letter (such that 'a' becomes 'z', 'b' becomes 'y' etc.; i.e. an Atbash -transformation) it can be solved like a ...

  9. Autokey cipher - Wikipedia

    en.wikipedia.org/wiki/Autokey_cipher

    The autokey cipher, as used by members of the American Cryptogram Association, starts with a relatively-short keyword, the primer, and appends the message to it.For example, if the keyword is QUEENLY and the message is attack at dawn, then the key would be QUEENLYATTACKATDAWN.

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