| An Architectural Overview of UNIX Network Security: A document from the Center for Information Technology, National Institutes of Health. |
| BlogFish: Weblog by Jonathan Weiss about Unix, BSD, security, Programming in Ruby, Ruby on Rails and Agile Development. |
| Computer Security: How to secure your Unix computer system (emphasis on HP-UX). |
| OpenBSD release errata: the OpenBSD CD errata page |
| Secure your Digital UNIX (Tru64) Alpha: Notes for securing a DEC/Compaq Alpha running Tru64 UNIX. |
| SysAdmin & Security Resource Center: Security, networking and UNIX resources for system administrators. |
| The Website of Johnny: About Linux/Unix, security, encryption. |
| Unix and Security Services and Solutions: Providing administration, installation, integration and consulting services for Unix and Security products and solutions. |
| Unix System Security Tools: An introduction to Unix security tools, including Ten General Security Rules. |
| Vapid Labs: Security, Linux, FreeBSD, IRIX, midikeys, exploit, Vulnerability, Networking |
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