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The Playfair cipher or Playfair square or Wheatstone–Playfair cipher is a manual symmetric encryption technique and was the first literal digram substitution cipher. The scheme was invented in 1854 by Charles Wheatstone, but bears the name of Lord Playfair for promoting its use. The technique encrypts pairs of letters ( bigrams or digrams ...
The Enigma machine is a cipher device developed and used in the early- to mid-20th century to protect commercial, diplomatic, and military communication. It was employed extensively by Nazi Germany during World War II, in all branches of the German military. The Enigma machine was considered so secure that it was used to encipher the most top ...
To decipher German military Enigma messages, the following information would need to be known. Logical structure of the machine (unchanging) The wiring between the keyboard (and lampboard) and the entry plate. The wiring of each rotor. The number and position(s) of turnover notches on the rings of the rotors. The wiring of the reflectors.
Caesar cipher. 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. In cryptography, a Caesar cipher, also known as Caesar's ...
The poem code is a simple and insecure, cryptographic method which was used during World War II by the British Special Operations Executive (SOE) to communicate with their agents in Nazi-occupied Europe. The method works by having the sender and receiver pre-arranging a poem to use. The sender chooses a set number of words at random from the ...
Encryption. The Atbash cipher is a particular type of monoalphabetic cipher formed by taking the alphabet (or abjad, syllabary, etc.) and mapping it to its reverse, so that the first letter becomes the last letter, the second letter becomes the second to last letter, and so on. For example, the Latin alphabet would work like this: Plain. A. B. C.
OCLC. 27866939. Preceded by. The Mystery of the 99 Steps. Followed by. The Spider Sapphire Mystery. The Clue in the Crossword Cipher is the forty-fourth volume in the Nancy Drew Mystery Stories series. [ 1] It was first published in 1967 under the pseudonym Carolyn Keene. [ 2] The actual author was ghostwriter Harriet Stratemeyer Adams .
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 1992–1999) 1991 Scorpion ciphers [3] Unsolved 1999 Ricky McCormick's ...