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2. Tor, "Tor: Anonymity Online," 2010, http://www.torproject.org.
3. Emerging Threats, "CVS Log for sigs/MALWARE/MALWARE_Socks_Proxy," 2008–2010, http://www.emergingthreats.net/cgi-bin/cvsweb.cgi/sigs/MALWARE/MALWARE_Socks_Proxy.
4. Al Iverson, "Al Iverson's DNSBL Resources," DNSB Resource, 2001–2009, http://www.dnsbl.com.
5. Lars Brinkhoff, "HTTP Tunnel," 2008, http://www.nocrew.org/software/httptunnel.html.
6. JCraft, "JCraft: Code the Craft, Craft the Code," 1998–2009, http://www.jcraft.com/jhttptunnel/.
7. "Webtunnel," SourceForge, 2010, http://sourceforge.net/projects/webtunnel/.