Famous commercial security companies
http://www.iss.net (Leading foreign provider of network security software and services)
http://www.is-one.net (Anshi China established by IIS, Softbank, and Trend Micro)
http://www.nai.com (Foreign famous computer virus and network security software service provider)
http://www.eeye.com (Foreign famous security company)
http://www.atstake.com (@stack company's website, foreign)
Famous vulnerability disclosure sites
http://www.securityfocus.com (Famous foreign vulnerability disclosure site, also known as bugtrap)
http://ntsecurity.net (Comprehensive website about Windows system security)
http://www.cert.org (United States Computer Emergency Response Team)
http://xforce.iss.net (Vulnerability database published by IIS)
http://www.bugnet.com (Vulnerability patching website)
http://icat.nist.gov/icat.cfm (ICAT vulnerability disclosure and vulnerability database search site)
http://www.chinafirst.org.cn (China Information Security Forum)
http://www.cert.org.cn/cert/index.php (China Computer Network Emergency Response Center)
Famous hacker sites
http://www.hack.co.za (Famous foreign hacker site with a comprehensive exploit library)
http://www.phrack.com (Famous foreign phrack security magazine)
http://www.antionline.com (Classic foreign hacker site)
http://www.rootshell.com (Classic foreign vulnerability and exploit library)
http://whitehats.com (White hat website with the latest IDS rule library downloads, related to snort, etc.)
http://lsd-pl.net (Publishes the latest exploit programs)
http://packetstormsecurity.com (Famous foreign vulnerability database with a large number of exploit programs)
http://oliver.efri.hr/~crv/security/bugs/lists.html (Well-organized latest vulnerability database downloads)
http://astalavista.box.sk (Famous software cracking site)
Foreign hackers http://lsd-pl.net/ LsD's site, the latest and most effective exploits
Foreign hackers http://www.s0ftpj.org Provides some highly skilled tools
Foreign hackers http://www.w00w00.org/ w00w00 organization's homepage
Foreign hackers http://www.2600.com/ 2600 Magazine
Foreign hackers www.experts-exchange.com Globally famous community
Foreign hackers www.is-it-true.org Similar to FAQ site, rich in resources
Foreign hackers www.ussrback.com ussr is back
Foreign hackers www.securiteam.com Very good security article and exploit tool download site
Foreign hackers www.neworder.box.sk Box Network team
Foreign hackers www.sysinternals.com sysinternals
Foreign hackers www.blackhat.com Black Hat, Inc
Foreign hackers http://p.ulh.as pulhashttp://www.blackcode.com/http://blog.ziffdavis.com/seltzer
Larry Seltzer is the security column editor of eWEEK.com in the United States. You can read his thoughts on security when you have time.
A security site in Russia
VKP's personal homepage, a professional in Linux security (programmer).
http://chess.eecs.berkeley.edu/trust/
University of California, Berkeley's "Popular Security Technology Research Group"
A Canadian site that mainly collects Linux security-related documents, including other Unix systems such as OpenBSD, Mac OS X, etc.
A website dedicated to providing security news for system administrators and hackers, established on September 8, 2002
http://www.2600.com/http://slashdot.org/http://www.antionline.com/
Foreign security http://www.neohapsis.com/ Very rich content
Foreign security http://www.deadly.org/ A lot of information, documents, and tutorials about OpenBSD
Foreign security http://www.guninski.com/ Security expert Guninski's homepage, with a large number of system vulnerabilities
Foreign security http://www.sysinternals.com Excellent tools and source code for Windows
Foreign security http://www.securityflaw.com/bible/ Well-organized site for intrusion detection and other documents
Foreign security http://www.secinf.net/ A large number of documents on network security
Foreign security http://www.incident-response.org Intrusion response, data recovery tools, etc.
Foreign security http://www.securityfocus.com/ The best-integrated security information site
Foreign security http://www.project.honeynet.org/ A project organized by a group of experts in the security field
Foreign security http://www.packetstormsecurity.com Comprehensive security site
Foreign security http://www.securityportal.com/ Another good security site to check out
Foreign security http://www.ussrback.com/ A relatively active security site
Foreign security http://www.attrition.org/ A comprehensive content security site
Foreign security http://www.wiretrip.net/rfp/2/index.asp RFP's security homepage, providing authoritative security information
Foreign security http://www.antionline.com/ A security site with some special columns
Foreign security http://www.eeye.com/ eEye's homepage, providing authoritative security advice and tools
Foreign security http://www.insecure.org/ Fyodor's homepage, the home of nmap, and also has exploits
Foreign security http://www.atstake.com/ @stack company's homepage, providing authoritative security advice
Foreign security http://www.bugnet.com/ Provides vulnerability patching
Foreign hackers http://lsd-pl.net/ LsD's site, the latest and most effective exploits
Foreign hackers http://www.s0ftpj.org Provides some highly skilled tools
Foreign hackers http://phrack.org/ Phrack's homepage, classic hacker technical e-magazine
Foreign hackers http://www.w00w00.org/ w00w00 organization's homepage
Foreign hackers http://mixter.void.ru/ Mixter's personal homepage, many useful tools
Foreign hackers http://www.thehackerschoice.com/ THC hacker organization's page, excellent security documents and tools
Foreign hackers www.win2000mag.net Windows