CERIAS: Center for Education and Research in Information Assurance and Security. University center for multidisciplinary research and education in areas of information security

COAST Internet Firewalls Hotlist: A list of firewall vendors, white papers, resources, and FAQs

International PGP Home Page: Information on the PGP program, the OpenPGP standard and the PGPi project. Detailed documentation, lists of products and services

ITU Recommendation X.509: Official web pages containing the standards published by the International Telecommunication Union

Kerberos: The Network Authentication Protocol: Reference distribution and official documentation for Kerberos. Software is subject to US export control. (MIT

OpenID: An open and decentralized identity system, designed "not to crumble if one company turns evil or goes out of business". Official site, with description, specifications, documentation, and resources

OpenSSL: A toolkit implementing SSL v2/v3 and TLS protocols with full-strength cryptography world-wide. It is based on SSLeay, developed by Eric Young and Tim Hudson. [Free / Open Source] (The OpenSSL Project

Recent Advances in Intrusion Detection: The RAID workshop series is an annual event dedicated to the sharing of information related to the intrusion-detection area

Security Focus: News and editorials on security related topics, along with a database of security knowledge

SecurityFocus: Intrusion detection focus area; designed to assist discussion on security related topics, and provides a database of security knowledge and resources. It also hosts the BUGTRAQ mailing list

Snort: A free lightweight network intrusion detection system for UNIX and Windows

The GNU Privacy Guard: An implementation of the OpenPGP standard. It allows to encrypt and sign data and communication, features a key management system and access modules for public key directories

US-CERT: Established in 2003 to protect the nation's Internet infrastructure, US-CERT coordinates defense against and responses to cyber attacks across the nation