The Army judged that these machines had lower security than the Navy's Purple design, so the Army's two cipher machines were less used.
42.
For inter-Allied communications during World War II, the Combined Cipher Machine ( CCM ) was developed, used in the Royal Navy from November 1943.
43.
When current was sent into most other rotor cipher machines, it would travel through the rotors and out the other side to the lamps.
44.
The cipher machine ( and its many revisions ) was used until the mid-1950s when other more modern military encryption systems came into use.
45.
He erroneously suggested that Japan's PURPLE cipher machine was a version of the German Enigma and confused " Dilly " Knox with a different person.
46.
In the 1920s four men in different countries invented rotor Vernam cipher machines to produce a key stream to act instead of a key tape.
47.
The first stream cipher machines, that were also rotor machines had some of the same problems of weak keys as the more traditional rotor machines.
48.
D�nitz revived the World War I idea of grouping several submarines together into a " Enigma cipher machine was believed to have made communications secure.
49.
After the war, surplus Enigmas and Enigma-like machines were sold to Third World countries, which remained convinced of the security of the remarkable cipher machines.
50.
Rowlett also played a crucial role in protecting American communications during World War II, making fundamental and innovative contributions to the design of the SIGABA cipher machine.
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