There are several Usenet newsgroups that you might find to be interesting sources of information on network security and related topics. However, the unmoderated lists are the same as other unmoderated groups on the Usenet: repositories of material that is often off-topic, repetitive, and incorrect. Our warning about material found in mailing lists, expressed earlier, applies doubly to newsgroups.
Computer security announcements, including new CERT-CC advisories
UNIX security
Miscellaneous computer and network security
Information about firewalls
Information on computer viruses and related topics
Alternative discussions of computer and network security
Computer administrative policy issues, including security
TCP/IP internals, including security
UNIX system administration, including security
UNIX kernel internals, including security
Discussions about cryptology research and application
Discussions about cryptology research
As described above
As described above