| Linux Administrator's Security Guide - A comprehensive security guide aimed at administrators and users, available online in Acrobat PDF format, by Kurt Seifried.
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| A Short History of Cryptography - A brief historical analysis of the management of cryptography.
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| Firewalling and Proxy Server HOWTO - Teaches the basics of firewall systems and give you some detail on setting up both a filtering and proxy firewall on a Linux based PC, by Mark Grennan.
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| Firewall Piercing mini-HOWTO - Tutorial on using ppp over telnet to do network stuff transparently through an Internet firewall. (François-René Rideau)
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| Linux IPCHAINS-HOWTO - Linux ipchains guide including details on firewalling, masqerading, and port forwarding.
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| Linux Security HOWTO - Security issues that face the administrator, security philosophy, examples of how to secure the system from intruders.
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| Secure POP via SSH mini-HOWTO - Explains how to set up secure POP connections using ssh, by Manish Singh.
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| Linux Security - Linux Security, server hardening, 1U server, 24x7 server admin, monitoring, IDS, NDS, firewalls
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| Introduction to Linux Networking and Security - Brief introduction to the IP networking services, how to configure them, and how to set up a relatively secure Linux workstation.
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| Linux Bridge+Firewall Mini-HOWTO - A tutorial on how to setup a bridge and a firewall with Linux, by Peter Breuer.
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| A Simple Scheme to Make Passwords Based on One-Way Functions Much Harder to Crack - Discusses the possibility that crackers might generate and distribute a massive list of encrypted passwords.
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| YoLinux: Internet Server Security HowTo and Tutorial - This tutorial covers the installation and use of hacker protection software such as Portsentry, tripwire, ssh. It also covers configuration and administration steps to make a Linux server secure against hackers.
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| Linuxs security basics - How to achieve the goal of every system admin: boring, predictable computers
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| Installing a firewall, Part 1 - Get the details of a secure Trustix 1.1 installation
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| Using Term to Pierce an Internet Firewall - Tutorial on using 'term' to do network stuff through a TCP firewall that you're not supposed to be able to, by Barak Pearlmutter.
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| Ritter's Crypto Glossary and Dictionary of Technical Cryptography - Hyperlinked definitions and discussions of many cryptographic, mathematics, logic, statistics, and electronics terms used in cipher construction and analysis.
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| Rusty's Remarkably Unreliable Guides - Netfilter project provides HOWTOs for packet filtering, NAT and netfilter code hacking for Linux.
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| Securing NIS - Provides a checklist on how to secure UNIX/Linux NIS (formerly YP) services in an intranet environment.
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| Security Overviews - Sec.ure.org contains overviews of security-enhancing procedures including Apache authentication, LDAP and several others.
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| Setting up a secure Linux server - Setting up a secure Linux server using RedHat and the Linux From Scratch system.
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| Linux Security White Papers - A small collection of Linux security white papers and other information resources. The papers cover secure shell (ssh), host security, and firewalls.
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| Network Security Information: UNIX - Network Security Library has links to many UNIX (and, especially, Linux) security articles on host hardening, security admin guides, and special purpose hardening tips.
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| UnOfficial SELinux FAQ - A technical FAQ for the NSA SELinux project, which covers installation and implementation issues.
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