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A cryptogram is a type of puzzle that consists of a short piece of encrypted text. [1] Generally the cipher used to encrypt the text is simple enough that the cryptogram can be solved by hand. Substitution ciphers where each letter is replaced by a different letter, number, or symbol are frequently used.
Olivier Levasseur's treasure cryptogram Unsolved 1760–1780 Copiale cipher: Solved in 2011 1843 "The Gold-Bug" cryptogram by Edgar Allan Poe: Solved (solution given within the short story) 1882 Debosnys cipher: Unsolved 1885 Beale ciphers: Partially solved (1 out of the 3 ciphertexts solved between 1845 and 1885) 1897 Dorabella Cipher ...
The Aristocrat Cipher, often referred to as the 'Aristocrat of Puzzles,' represented a significant shift in the paradigm of cryptography, particularly within the American Cryptogram Association, which popularized this challenging form of monoalphabetic substitution cipher.
Edgar Allan Poe, author of the book, A Few Words on Secret Writing, an essay on cryptanalysis, and The Gold Bug, a short story featuring the use of letter frequencies in the solution of a cryptogram. Johannes Trithemius, mystic and first to describe tableaux (tables) for use in polyalphabetic substitution.
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.
Considered one of the classic books on the subject, and includes many sample ciphertext for practice. It reflects public amateur practice as of the inter-War period. The book was compiled as one of the first projects of the American Cryptogram Association. Goldreich, Oded (2001 and 2004). Foundations of Cryptography. Cambridge University Press.
The cipher's key is , the number of rails.If is known, the ciphertext can be decrypted by using the above algorithm. Values of equal to or greater than , the length of the ciphertext, are not usable, since then the ciphertext is the same as the plaintext.
The Alberti Cipher disk. The Alberti Cipher, created in 1467 by Italian architect Leon Battista Alberti, was one of the first polyalphabetic ciphers. [1] In the opening pages of his treatise De componendis cifris [] he explained how his conversation with the papal secretary Leonardo Dati about a recently developed movable type printing press led to the development of his cipher wheel.