A Linux-PAM page
- The primary distribution site for the Linux-PAM (Pluggable Authentication Modules for Linux) project. PAM is a flexible mechanism for authenticating users.
AirSnort Homepage
- A wireless LAN (WLAN) tool which cracks encryption keys on 802.11bWEP networks.
BackTrack
- A Slackware-based, live CD Linux distribution with over 300 security tools useful for tasks such as security audits and penetration testing. This distribution evolved from the merger Whax and Auditor Security Collection distributions.
Bastille Linux - hardening script for security conscience
- The Bastille Hardening program "locks down" an operating system, proactively configuring the system for increased security and decreasing its susceptibility to compromise. It can also assess a system's current state of hardening, granularly reporting on each of the security settings with which it works. Currently supports the Red Hat (Fedora Core,Enterprise, and Numbered/Classic), SUSE, Debian, Gentoo, and Mandriva distributions, along with HP-UX.
CIPE - Crypto IP Encapsulation
- An ongoing project to build encrypting IP routers. Latest stable release is 1.6.0, 2004-08-03.
Common Vulnerabilities and Exposures
- A list of standardized names for vulnerabilities and other information security exposures. The goal of CVE is to make it easier to share data across separate vulnerability databases and security tools.
Creating Snort Rules with EnGarde HOWTO
- This HOWTO provides a step-by-step guide to writing custom rules for Snort, an intrusion detection and prevention application. (2007)
Crypto-Gram Newsletter
- Bruce Schneier's Crypto-Gram Newsletter is the one of best sources of information and analysis on computer and other security issues.
Darik's Boot and Nuke (DBAN)
- A cross-platform application to wipe data off of a hard disk and return the disk to a pristine state for reuse.
Debian Security Audit Project
- The aim of the project is to audit as many of the packages within the Debian stable release as possible for potential flaws; important packages, which are contained in the unstable distribution, may also be examined for flaws as time permits.
Electronic Privacy Information Center
- A public interest research centre in Washington, D.C. It was established in 1994 to focus public attention on emerging civil liberties issues and to protect privacy, the U.S. First Amendment, and constitutional values.
Ettercap
- A multipurpose sniffer/interceptor/logger for switched LAN. Latest stable release is 0.7.3, 2005-05-29.
GNU httptunnel
- An application that creates a bidirectional virtual data connection tunnelled in HTTP requests; the HTTP requests can be sent via an HTTP proxy.
Help Net Security
- Excellent meta site for webserver security, news, software and information.
HoneyNet Project
- The Honeynet Project is a U.S.-based non-profit volunteer research organization dedicated to raising awareness to and improving the security of the Internet.
Insecure.Org -- Nmap Security Scanner
- Stealth port scanner for network security auditing, general internet exploration & hacking. Designed to rapidly scan large networks, although it works fine against single hosts.
Jail Chroot Project
- A login tool which works as a wrapper to the user shell.
Knocker - The Net Port Scanner
- A cross-platform TCP security port scanner; capable of analyzing hosts and the network services which are running on them. Latest release is 0.6.6, 2002.
Know Your Enemy: Honeynets
- Detailed paper that discusses what a Honeynet is, its value, how it works, and the risks/issues involved. (2006)
LIDS - Linux Intrusion Detect System
- LIDS is a kernel patch and admin tools which enhances the kernel's security by implementing Mandatory Access Control (MAC).
LWN: Security Index
- This index covers articles that appeared in LWN on various security-related topics. Articles from 2007 onwards are indexed here.
LaBrea Homepage
- Honeypot software that sets up virtual machines with virtual vulnerabilities for potential crackers; aptly named after the LaBrea Tarpits in California.
Linsec.ca
- This site contains primarily security-related articles, tips, and advice. Also included are tips for using LDAP as an address book, Mac OS X tips, book reviews, and software reviews.
Linux Security Documentation and Resources
- A comprehensive resouce centre; includes FAQs/HOWTOs, forums, whitepapers, resources on firewalls, host security, cryptography, network security, intrusion detection, securing Linux systems, a quick reference guide, and an administrator's guide.
Medusa DS9 Security System
- Used to increase Linux's security. It consists of two major parts: Linux kernel changes and the user-space daemon. Latest version is 1.0, kernel patch for 2.4.26, 2004-04-10. Named for the StarTrek movie, "Medusa Deep Space Nine (DS9).
Nessus Vulnerability Scanner
- As of the 3.0 release (2005), no longer licensed under the GPL and is now proprietary software (but free as in beer); previous versions remain GPL'd.
Open1X
- The Open1X project is dedicated to bringing a free, open source 802.1X/WPA/WPA2/IEEE802.11i implementation to as many target platforms as possible.
OpenCA Research Labs
- An open organization that provides a framework for PKI (Public Key Infrastructure) studying and development of related projects.
OpenSSL: The Open Source toolkit for SSL/TLS
- A collaborative effort to develop a robust, commercial-grade, full-featured, and open source toolkit implementing the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1) protocols.
Openswan:
- An implementation of IPsec for Linux. It supports kernels 2.0, 2.2, 2.4 and 2.6, and runs on many different platforms. A code fork of the FreeS/wan project.
Privoxy
- A web proxy with advanced filtering capabilities for protecting privacy, filtering web page content, managing cookies, controlling access, and removing ads, banners, pop-ups and other obnoxious junk.
Radius
- A server for remote user authentication and accounting. Its primary use is for Internet Service Providers (ISPs); latest release 1.3, 2004-11-20.
Security-Enhanced Linux
- SE Linux is a version of the Linux kernel enhanced for security purposes. It is developed by the U.S. government's National Security Agency and Secure Computing Corporation with the contributions of the University of Utah. Not strictly a Linux distribution.
The phrack.com Homepage
- A hacker magazine by the community for the community; articles on a variety of tech issues including Linux as well as security issues.
Tor
- An anonymous Internet communication system. Great internationalization effort - ~15 languages.
Tripwire Security Systems, Inc.
- Proprietary tools to monitor, detect and audit changes to computer systems; runs on Linux platforms.
TrueCrypt
- Cross-platform disk encryption software which features real-time, "on-the-fly" encryption (OHFE), encryption of an entire hard disk partition or a storage device such as a USB flash drive, and provides two levels of plausible deniability. Latest release is 5.0, 2008-02-05.
Trustees
- A recursive ACL (access control list) scheme for the Linux 2.6 kernel's Linux Security Module(LSM) framework.
Untangle
- An open source (GPLv2) security gateway complete with 14 applications including intrusion detection, spam, phish, and virus blocking, web content filtering, firewall, and remote access applications - VPN and remote access portal.
VulnWatch - Vulnerability Disclosure List
- A computer security vulnerability disclosure mailing list supported and run by a community of volunteer moderators distributed around the world.
Welcome to CERT!
- A centre for Internet security research which studies Internet security vulnerabilities and long-term changes in networked systems, and develops information and training to help users improve security. Based at Carnegie Mellon University in the U.S.A.
Wipe: Secure File Deletion
- A file and block device wiping utility. Latest stable release is 2.2.0, 2004-01-10.
Xatrix Security -- A Computer Security News Portal
- A computer security website containing security advisories and vulnerabilities, forums, free online books (security, Linux, programming languages, and databases), and security news.
Zebedee: Secure TCP/IP Tunnel
- A simple program to establish an encrypted, compressed tunnel for TCP/IP or UDP data transfer between two systems.