Most machines that are on public display today, have been ‘sanitized’, and all wiring has been removed.ĭespite the secrecy surrounding the KL-7 and its history, the mystery is gradually being unravelled as the NSA releases more and more historical documents and researchers manage to uncover the technical details of the machine. Unfortunately, KL-7 is still a classified item and only few of them have survived. They were also used for communication by Foreign Affairs. The machines came in several variations and were used by the US Army, Navy and NATO for many years. Unlike Enigma, the KL-7 has eight rotors, seven of which are moved in a complex irregular stepping pattern. It is also known by key-procedure codenames ADONIS (high-level) and POLLUX (low-level). The initial name for the machine was AFSAM-7, but changed to TSEC/KL-7 in the early 1960s. It replaced the wartime SIGABA (ECM Mark II) and in some countries, such as the UK and Canada, also the CCM and the British Typex machines. It is relatively light-weight (9.3 kg) and is essentially a more advanced version of the German Enigma machine.
It was introduced in 1952 and served for many years as the main cypher machine of the US and NATO. KL-7 was an electro-mechanical rotor-based off-line cypher machine, developed by the National Security Agency (NSA) in the US.
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