The best work, traditionally, in counterintelligence has of course come from military efforts during war time. Well, not any more. Now, private firms looking to keep secrets safe from competitors and rivals are trying (with varying levels of success) to develop protocols that would make Enigma look like a child’s puzzle.
Read more here: http://www.iotevolutionworld.com/iot/articles/426387-root9b-announces-security-effort-with-united-states-air.htm