1. Bruce Schneier, Applied Cryptography (New York: Wiley and Sons, 1996) 219.
2. http://www.safeweb.com
3. David Martin and Andrew Schulman, Deanonymizing Users of the Safe Web Anonymizing Service, Technical Report 2002-003, Boston University Computer Science Department, February 2002. To appear in Proceedings of the 11th USENIX Security Symposium, August 2002.
4. New PRC Internet Regulation
http://www.usembassy-china.org.cn/english/sandt/netreg.htm
5. Steve Friess, ”China Re-Blocks News Sites,” Wired News
http://www.wired.com/news/politics/0,1283,47121,00.html