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The most common of these is data encryption, where using the Encryption Algorithms you convert plaintext to ciphertext, allowing your data to be stored without easy exfiltration. [ 4 ] Leon Battista Alberti conceived of the first polyalphabetic cipher system using rotating disks, described in his work De Cifris around 1467 [ 5 ] .
The work of Al-Qalqashandi (1355–1418), based on the earlier work of Ibn al-Durayhim (1312–1359), contained the first published discussion of the substitution and transposition of ciphers, as well as the first description of a polyalphabetic cipher, in which each plaintext letter is assigned more than one substitute. [1]
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.
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Image of Bacon's cipher. Bacon's cipher or the Baconian cipher is a method of steganographic message encoding devised by Francis Bacon in 1605. [1] [2] [3] In steganograhy, a message is concealed in the presentation of text, rather than its content.
An easy way to do this is for the sender and the recipient to agree that a certain number of characters into the message, the scales would be shifted one character to the right, repeating the procedure every (say) tenth letter.