Encryption devices

German cipher machine

thumb|right|A scytale with a leather strip

Cipher machines used by the German Army during World War II

Japanese diplomatic code named Purple by the US

thumb|The M-209 In cryptography, the M-209, designated CSP-1500 by the United States Navy (C-38 by the manufacturer) is a portable, mechanical cipher machine used by the US military primarily in World War II, though it remained in active use through the Korean War. The M-209 was designed by Swedish cryptographer Boris Hagelin in response to a request for such a portable cipher machine, and was an improvement of an earlier machine, the C-36.

thumb|upright=1.2|SIGABA cipher machine at the National Cryptologic Museum, with removable rotor assembly on top In the history of cryptography, the ECM Mark II was a cipher machine used by the United States for message encryption from World War II until the 1950s. The machine was also known as the SIGABA or Converter M-134 by the Army, or CSP-888/889 by the Navy, and a modified Navy version was termed the CSP-2900.

World War II German cipher machine and teleprinter

Cipher system invented by Thomas Jefferson

right|thumb|300px|SIGSALY exhibit at the National Cryptologic Museum

Japanese World War II cipher machine

American cryptographer (1869-1952)

cipher machine

1950s cipher machines by Crypto AG

discipline of preventing unauthorized interceptors from accessing telecommunications

thumbnail|280px|The standard Kryha machine weighed around five kilograms and was totally mechanical. While the machine achieved a measure of popularity, its security was relatively weak; US cryptanalyst William Friedman reported that he solved the device within 2 hours and 41 minutes. In the history of cryptography, the Kryha machine was a device for encryption and decryption, appearing in the early 1920s and used until the 1950s. The machine was the invention of (born 31.10.1891 in Charkow, Russian Empire, committed suicide in Baden-Baden in 1955). During the Second World War, Kryha worked as

piece of cryptographic hardware

tool to encrypt and decrypt messages

thumbnail|Rockex equipment Rockex, or Telekrypton, was an offline one-time tape Vernam cipher machine known to have been used by Britain and Canada from 1943. It was developed by Canadian electrical engineer Benjamin deForest Bayly, working during the war for British Security Coordination.