Cryptography in OpenBSD: An Overview. - Theo de Raadt; Niklas Hallqvist; Artur Grabowski; Angelos D. Keromytis; Niels Provos (USENIX ATC, FREENIX Track, 1999)

Implementing Internet Key Exchange (IKE). - Niklas Hallqvist; Angelos D. Keromytis (USENIX ATC, FREENIX Track, 2000)