Reeds, Ritchie, Morris, 1978. <https://t.co/MbE5UNMtzb>https://cryptome.org/2015/12/ReedsTheHagelinCipherBellLabs1978.pdf
NSA would not release it under FOIA, claiming it was a private paper. Back story: http://bell-labs.com/usr/dmr/www/crypt.html
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