Theo de Raadt Niklas Hallqvist Artur Grabowski Angelos D. Keromytis Niels Provos Cryptography in OpenBSD: An Overview. 93-101 1999 conf/usenix/1999f USENIX Annual Technical Conference, FREENIX Track http://www.usenix.org/events/usenix99/deraadt.html db/conf/usenix/usenix1999f.html#RaadtHGKP99