ftp://cerias.purdue.edu/This archive is maintained by the CERIAS computer and network security laboratory at Purdue University (see the earlier description under the CERIAS web page) under the direction of Gene Spafford. It contains a large collection of software and papers, collected from all over the world, related to Unix and network security.
ftp://info.cert.org/This site contains all of the Computer Emergency Response Team Coordination Center (CERT-CC) past advisories (see the discussion of CERT-CC under "Organizations", later in this appendix), as well as a small collection of tools and papers.