Combined Cipher Machine
The Combined Cipher Machine (CCM) (or Combined Cypher Machine) was a common cipher machine system for securing Allies of World War II, Allied communications during World War II and, for a few years after, by NATO. The United Kingdom, British Typex machine and the United States, US ECM Mark II were both modified so that they were interoperable. History The British had shown their main cipher machine — Typex — to the US on their entry into the war, but the Americans were reluctant to share their machine, the SIGABA, ECM Mark II. There was a need for secure inter-Allied communications, and so a joint cipher machine adapted from both countries' systems was developed by the US Navy. Use The "Combined Cipher Machine" was approved in October 1942, and production began two months later. The requisite adapters, designed by Don Seiler, were all manufactured in the US, as Britain did not have sufficient manufacturing resources at the time. The CCM was initially used on a sm ...
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