Famous commercial security companies
http://www.iss.net (a leading foreign network security software and service provider)
http://www.is-one.net (Anshi China established by IIS, SoftBank, and Trend Micro)
http://www.nai.com (a famous foreign computer virus and network security software service provider)
http://www.eeye.com (a famous foreign security company)
http://www.atstake.com (@stack company's website, foreign)
Famous vulnerability disclosure sites
http://www.securityfocus.com (a famous foreign vulnerability disclosure site, bugtrap)
http://ntsecurity.net (a comprehensive website about Windows system security)
http://www.cert.org (US 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 (a famous foreign hacker site with a comprehensive exploit library)
http://www.phrack.com (a famous foreign phrack security magazine)
http://www.antionline.com (a classic foreign hacker site)
http://www.rootshell.com (a classic foreign vulnerability and exploit library)
http://whitehats.com (white hat website, with the latest IDS rule library download, about snort, etc.)
http://lsd-pl.net (publishes the latest exploit programs)
http://packetstormsecurity.com (a famous foreign vulnerability database, with a large number of exploit programs)
http://oliver.efri.hr/~crv/security/bugs/lists.html (download the latest vulnerability database)
http://astalavista.box.sk (a famous software cracking site)
Foreign hackers http://lsd-pl.net/ LsD's site, the latest and most effective exploit
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 A famous global community
Foreign hackers www.is-it-true.org A site similar to FAQ, rich in resources
Foreign hackers www.ussrback.com ussr is back
Foreign hackers www.securiteam.com A very good security article and vulnerability exploitation 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 columnist for 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/
"Popular Security Technology Research Group" at the University of California, Berkeley
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 and documentation 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 site for integrating security information
Foreign security http://www.project.honeynet.org/ A project organized by a group of experts in the security industry
Foreign security http://www.packetstormsecurity.com Comprehensive security site
Foreign security http://www.securityportal.com/ Another good security site
Foreign security http://www.ussrback.com/ A more active security site
Foreign security http://www.attrition.org/ Comprehensive content security site
Foreign security http://www.wiretrip.net/rfp/2/index.asp rfp 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 company's homepage, providing authoritative security advice and tools
Foreign security http://www.insecure.org/ Fyodor's homepage, nmap's home, and exploit
Foreign security http://www.atstake.com/ @stack company's homepage, providing authoritative security advice
Foreign security http://www.bugnet.com/ Providing vulnerability patches
Foreign hackers http://lsd-pl.net/ LsD's site, the latest and most effective exploit
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