Intrusion Detection

SecurityFocus is the most comprehensive and trusted source of security information on the Internet. SecurityFocus is a vendor-neutral site that provides objective, timely and comprehensive security information to all members of the security community, from end users, security hobbyists and network administrators to security consultants, IT Managers, CIOs and CSOs.

the ISC provides a free analysis and warning service to thousands of Internet users and organizations, and is actively working with Internet Service Providers to fight back against the most malicious attackers

a leading provider of advanced technology and software solutions in IT Security, Enterprise Messaging, Analytics and Custom Software Development

Large index of computer security resources, including a glossary of Intrusion Detection and Prevention systems.

The Center for Education and Research in Information Assurance and Security (CERIAS) is currently viewed as one of the world's leading centers for research and education in areas of information security that are crucial to the protection of critical computing and communication infrastructure.

LinuxSecurity.com has grown to encompass not only this website but also two leading industry email newsletters, Linux Security Newsletter and Security Advisories Weekly. With more than 16,000 subscribers, these newsletters represent yet another opportunity to help further the advocacy and adoption of Linux by users everywhere.

Provides books, articles, software and other information on penetration testing and other security issues.