Collects and disseminates computer security information and resources to help users, systems administrators, managers, and security professionals better protect their data and systems. http://csrc.ncsl.nist.gov/
Thamer Al-Herbish's Raw IP Networking FAQ about networking below TCP/UDP and sniffing networks. Includes raw socket source code. http://www.whitefang.com/rin/
This report, written as a case study, presents results of a detailed information security audit of UNIX systems that belong to a fictitious company. It illustrates an approach to performing such an examination. http://www.zeltser.com/auditing-unix-systems/