see url:
http://www.wsj.com/articles/how-the-u-s-fights-encryptionand-also-helps-develop-it-1456109096
Interesting article on development of encryption for various platforms
by various US government depts...and their use for purposes which they
were NOT intended. i.e. subversion of US and western governments rather
than the dictatorships in the rest of the world, especially the Far East.