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cipher office

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  • Office of Strategic Services — OSS OSS Shoulder Insignia Agency overview Formed June 13, 1942 Dissolved …   Wikipedia

  • Cipher in the Snow — Directed by Keith J. Atkinson Produced by Judge Whitaker Keith J. Atkinson Written by Jean Mizer Screenplay by Carol Lynn Pearson …   Wikipedia

  • Office of Censorship — The Office of Censorship was an emergency wartime agency set up on December 19, 1941 to aid in the censorship of all communications coming into and going out of the United States. Contents 1 Overview 2 The Code of Wartime Practices 3 Censorship… …   Wikipedia

  • Purple (cipher machine) — This article is about the Japanese cipher Purple, also known as AN 1 (citation for AN 1 nomenclature for Purple?). For other Japanese ciphers, such as JN 25 which played a part in the Battle of Midway, see Japanese naval codes. In the history of… …   Wikipedia

  • Playfair cipher — The Playfair cipher or Playfair square is a manual symmetric encryption technique and was the first literal digraph substitution cipher. The scheme was invented in 1854 by Charles Wheatstone, but bears the name of Lord Playfair who promoted the… …   Wikipedia

  • Lorenz cipher — Tunny redirects here. For the fish, see Tuna. The Lorenz SZ 40 and SZ 42 ( Schlüsselzusatz , meaning cipher attachment ) were German cipher machines used during World War II for teleprinter circuits. British codebreakers, who referred to… …   Wikipedia

  • Transposition cipher — In cryptography, a transposition cipher is a method of encryption by which the positions held by units of plaintext (which are commonly characters or groups of characters) are shifted according to a regular system, so that the ciphertext… …   Wikipedia

  • Dorabella Cipher — The text of the Dorabella Cipher, in Elgar s handwriting The Dorabella Cipher is an enciphered letter written by Edward Elgar to Miss Dora Penny, which was accompanied by another dated July 14, 1897. Penny was never able to decipher it and its… …   Wikipedia

  • Cryptanalysis of the Lorenz cipher — The Lorenz SZ machines had 12 wheels each with a different number of cams (or pins). Wheel number 1 2 3 4 5 6 7 …   Wikipedia

  • Libelle (cipher) — Libelle is a German cipher system, developed by the Federal Office for Information Security. The algorithm is not publicised, in an attempt to make cryptanalysis more difficult. Some experts think this security through obscurity is a bad approach …   Wikipedia

  • Federal Office for Information Security — The Bundesamt für Sicherheit in der Informationstechnik (abbreviated BSI in English: Federal Office for Information Security) is the German government agency in charge of managing computer and communication security for the German government. Its …   Wikipedia

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