Toshiki Habutsu Yoshifumi Nishio Iwao Sasase Shinsaku Mori A Secret Key Cryptosystem by Iterating a Chaotic Map. 127-140 http://link.springer.de/link/service/series/0558/bibs/0547/05470127.htm 1991 EUROCRYPT db/conf/eurocrypt/eurocrypt91.html#HabutsuNSM91