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Discussion forum for topics surrounding the underground, technology and the like.

Discussion forum for Southern California security experts and hackers. [RSS]

Large Macintosh security and underground topic discussion forum.

One of the worlds longest established hacking forums, offering resources covering everything from cracking to phreaking.

Many topics and threads about Vulnerabilities, Hacking, Phreaking, and programming. Informative and active.

Discussion forum about the insecurity of humans known as social engineering.

Forum dedicated to bringing knowledge to people starting out in hacking.

Security and Development Forum with a Security Basics Forum and Vuln-Dev.