W3C Security Resources

Links to security initiatives such as PICS Signed Labels, and XML-DSig. (W3C)
http://www.w3.org/Security/

Network Security, Filters and Firewalls

General introduction to network security issues and solutions in the Internet
http://www.acm.org/crossroads/xrds2-1/security.html

Common Vulnerabilities and Exposures

A searchable database of internet security problems.
http://www.cve.mitre.org/

Dingbat's Warehouse

Information about viruses, intrusion detection software, personal firewalls, and privacy. Hosts a streaming webcast called The Byte Show on security-related topics; CD-ROMs of interviews and software available.
http://www.thebyteshow.com/

Why the Internet is not secure.

An explanation of why consumer communications over the Internet are presently not secure.
http://www.hydrophones.com/insecure.html

SuraSoft

Offers news, tutorials, articles, and forum.
http://www.surasoft.com/

About.com Internet/Network Security

Featuring articles and web links on Internet and network security for the Unix and Windows platforms.
http://netsecurity.about.com/index.htm

Dutch Security Information Network

Security news and links in English and Dutch.
http://www.dsinet.org/

Operation Security

Directory of links and tools.
http://www.operationsecurity.com/

My online security

Security portal, providing internet security related news, resources, tools and services.
http://www.myonlinesecurity.com

Intrusion Detection FAQ

Frequently asked questions about intrusion detection, from the SANS Institute.
http://www.sans.org/resources/idfaq/

Stay Safe Online

Tools and resources to empower home users, small businesses, schools and universities to stay safe online.
http://www.staysafeonline.info/

ITsafe

UK government security service to help protect computers, mobile phones and other devices from malicious attack. Offers advice, bulletins, glossary, library and links plus an alerting service.
http://www.itsafe.gov.uk/

Firstmonday - Covert Channels in the TCP/IP Protocol Suite

Article on how to secretly transmit information using TCP headers.
http://www.firstmonday.org/issues/issue2_5/rowland/