Matt's Unix Security Page
Matt's Unix Security Page provides published papers, software exploits, and plenty of good links to meet your Unix Security needs.
www.deter.com/unix/   reviews

Securing NIS
Securing NIS (formerly YP) The following is a brief compendium of what we at Auburn Univeristy College of Engineering use to secure our NIS networks. We had a mix of about 65% NIS, 35% NIS+ network before dropping NIS+ due to reliability problems and setting all machines to use NIS. The following is our implementation of securing NIS using various vendor patches and free utilities from around ...
www.eng.auburn.edu/users/doug/nis.html   reviews