The Forbidden Web Archive - Security and Development Forum with a Security Basics Forum and Vuln-Dev.
HFX International Forum - Discussion forum for topics surrounding the underground, technology and the like.
SecureRoot - One of the worlds longest established hacking forums, offering resources covering everything from cracking to phreaking.
Social Engineering - Discussion forum about the insecurity of humans known as social engineering.
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Irvine Underground Forums - Discussion forum for Southern California security experts and hackers. [RSS]
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