This document discusses techniques for circumventing internet censorship, including methods for detection of censorship like stream reconstruction and keyword matching, blocking techniques used by censors like IP blocking and DNS poisoning, and counter-techniques for bypassing censorship through proxies, secure transfers, tunneling services, and active circumvention projects. It also notes that the information discussed is from public sources and does not involve sharing of classified information.

1. 2010-5

2.  下面将要展示的内容均来自公开资料
 绝无泄露国家机密
 谢绝跨省追捕

4.  Detection
 Stream reconstruction
 Keyword pattern matching

5.  Blocking
 IP blocking
▪ Route hijack
 DNS poisoning
 Connection reset

6.  Deployment

9.  Anti- IP blocking
 Proxy
 Tunneling

10.  Anti- DNS poisoning
 Set hostname-IP mapping in hosts file
 DNS client filters out spurious responses
 Remote DNS lookup
 DNSSEC

11.  Anti- Keyword detection
 Secure transfer
▪ HTTPS
▪ Secure tunneling

12.  Tunneling
 SSH tunnel
 VPN
 TOR

14.  Active anti-GFW
 西厢计划