enciphered code
21Enigma machine — Military Enigma machine …
22Bletchley Park — Infobox Museum name = Bletchley Park imagesize = 200 caption = During World War II, codebreakers at Bletchley Park decrypted and interpreted messages from a large number of Axis code and cipher systems, including the German Enigma machine. For… …
23Voynich manuscript — The Voynich manuscript is a mysterious illustrated book written in an indecipherable text. It is thought to have been written between 1450 and 1520. The author, script and language of the manuscript remain unknown.Over its recorded existence, the …
24Typex — In the history of cryptography, Typex (alternatively, Type X or TypeX) machines were British cipher machines used from 1937. It was an adaptation of the commercial German Enigma with a number of enhancements that greatly increased its security.… …
25Banburismus — was a process invented by Alan Turing at Bletchley Park in England during the Second World War. It was used by Hut 8 at Bletchley Park to break German Kriegsmarine (i.e., Naval) Enigma. It was a codebreaking procedure which used an early form of… …
26German submarine U-505 — U 505 is a Type IXC U boat of the Kriegsmarine that was captured on 4 June 1944 by United States Navy Task Group 22.3 (TG 22.3). Codebooks and other secret materials from U 505 assisted Allied code breaking operations. U 505 was the first warship …
27Fort Ward (Washington) — Infobox nrhp name = Fort Ward Historic District and Boundary Increase nrhp type = hd caption = lat degrees = lat minutes = lat seconds = lat direction = long degrees = long minutes = long seconds = long direction = location = nearest city =… …
28Purple (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… …
29Jefferson disk — The Jefferson disk, or wheel cypher as Jefferson named it, is a cipher system using 26 wheels, each with the letters of the alphabet arranged randomly around them. First invented by Thomas Jefferson in 1795, it did not become well known and was… …
30Hill cipher — Hill s cipher machine, from figure 4 of the patent In classical cryptography, the Hill cipher is a polygraphic substitution cipher based on linear algebra. Invented by Lester S. Hill in 1929, it was the first polygraphic cipher in which it was… …
