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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.
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.
A simple illustration of public-key cryptography, one of the most widely used forms of encryption. In cryptography, encryption (more specifically, encoding) is the process of transforming information in a way that, ideally, only authorized parties can decode.
Sheffer is a surname, and may refer to: Alla Sheffer, Israeli-Canadian computer scientist; Craig Sheffer (born 1960), American actor; Daniel Sheffer (1783–1880), U.S. congressman; Doron Sheffer (born 1972), Israeli basketball player; Henry M. Sheffer (1882–1964), American logician; Hogan Sheffer (born 1958), American screenwriter
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The action of a Caesar cipher is to replace each plaintext letter with a different one a fixed number of places down the alphabet. The cipher illustrated here uses a left shift of 3, so that (for example) each occurrence of E in the plaintext becomes B in the ciphertext.