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Server distribution from ALT Linux Team. Improved security is achieved with the use of RSBAC, general privilege separation approaches, and certain pieces and ideas from Owl. A beta is available for testing and use.
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 So there is a castle here Why, of course the young man said slowly, while several peasantsšhere and there shook their heads at K the Castle of Count Westwest And one needs permission to spend the night here asked K...
http://castle.altlinux.ru

Server distribution; packages chosen based on their security record, safe defaults used. Available for use.
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Trustix Secure Linux Home  Linux is a distribution for servers with a heavy focus on security and stability. One of the main features of Trustix is its small size which combined with easy updating by the automated secure software updater swup, makes it a...
http://www.trustix.net/

Server distribution, goal: provide level of security needed to create corporate web presence or conduct business on Web. Security achieved via included software and using principle of least privilege; available for use.
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 Click for EnGarde Secure Linux...
http://www.engardelinux.org/

NSA research prototype made public, has modified kernel, several utilities; has enhanced security-related functions designed to show value of mandatory access controls and how such can be added to Linux; not a full OS distribution.
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Security-Enhanced Linux  Agency has long been involved with the computer security research community in investigating a wide range of computer security topics including operating system security. Recognizing the critical role of operating system security mechanisms in supporting security at higher levels, researchers...
http://www.nsa.gov/selinux/

Owl
Openwall GNU/*/Linux is a server distribution; main means to security: proactive source code review, privilege separation; several other means also used. Available for use. English, French, German, Russian.
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Openwall GNU Linux (Owl a security-enhanced server platform  D advisories presentations services donations wordlists passwords signatures mirrors CVSweb bringing security into open environments Other languages: French, German, Russian Order Openwall GNU Linux 1.1 on a CD with delivery worldwide Owl homepage Other languages: French, German, Russian Concepts Architectures...
http://www.openwall.com/Owl/

Server platform using compartmentalization to contain processes to known part of filesystem and network; has system level auditing, supports remote configuration. Mostly closed source. Was commercial product, now discontinued, unsupported.
http://www.hp.com/security/products/linux/

Appliance-based special-purpose hardened Linux distribution with firewall, VPN, anti-virus functionality. Some functionality is available for free for home use, the rest is commercial.
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Firewall and Network Security Software by Astaro  Firewall and network security software from Astaro offers complete firewall and network security solutions in a variety of Linux software products. Astaro internet security products provides six essential security applications, including firewall security protection, in one easy-to-manage package. Network Firewall...
http://www.astaro.com

Small CD-based distribution used for firewalls, routers. System configuration settings are stored on separate floppy disk. Descriptions, news, documents, downloads, links.
http://www.devil-linux.org/

Linux-based bootable CD suitable for use as low cost, easy to maintain firewall or IDS node.
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Sentry Firewall CD Firewall/IDS Node on a CD-ROM  A different firewall approach NewsForge, 2005/05/25 Sentry Firewall CD Simple Safety Linux Magazine, 2004/04/01 A Taste of Linux eWeek, 2004/02/20 Security Applications Linux Journal, 2001/09/01 Sentry Firewall CD TM www.SentryFirewall.com Sentry.SourceForge.net CDROM-Based Firewall/Server/IDS(Intrusion Detection System) Now this is some CD....
http://www.sentryfirewall.com/

Bootable linux live CD-ROM for system and network security testing.
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Plan-B The Network Security Auditing and Forensics Utility  If your browser does not support frames or you if prefer not use them goto noframes...
http://www.projectplanb.org/

Distribution designed mainly for security, performance, and to provide users with current, high quality software. All packages optimized for Pentium-class CPUs.
http://www.jblinux.net/

Fed up with costly, complex firewalls, e-gaming firm eBet Ltd., picks open source security; senior systems administrator knew he needed to upgrade from Check Point 4.0 perimeter firewall. [Linux Journal]
http://www.linuxjournal.com/article.php?sid=7313