Tor(The Onion Router)是第二代onion routing(洋葱路由)的一种实现,用户通过Tor可以在因特网上进行匿名交流.最初该项目由美国海军研究实验室(US Naval Research Laboratory)赞助.2004年晚些时候,Tor成为电子前哨基金会(Electronic Frontier Foundation,EFF)的一个项目.2005年后期,EFF不再赞助Tor项目,但他们继续维持Tor的官方网站.
Tor 的目标是抵御流量分析，流量分析是一种对网络的监视行为，这种行为会威胁个人的匿名与隐私，商业活动与业务关系的保密和国家的安全。通信在一个由叫做“洋 葱路由器”的服务器所构建的分布式网络上传输，保护你以免网站构建你的兴趣简档，本地的、甚至是洋葱路由器上的窃听者阅读你的数据、了解你所访问的站点。
Tor 的安全性随着用户群的扩大和更多的人志愿运行服务器而得到增强。请考虑贡献你的时间或者贡献你的带宽。最后请记住，这是一项进行中的项目——如果你真的需要强健的匿名，现有的 Tor 网络也许并不适合。
Changes in version 0.2.0.9-alpha - 2007-10-??
o Major bugfixes:
- Stop publishing a new server descriptor just because we HUP or when we find our DirPort to be reachable but won't actually publish it. Extra descriptors without any real changes are dropped by the authorities, and can screw up our "publish every 18 hours" schedule.
o Minor features (router descriptor cache):
- If we find a cached-routers file that's been sitting around for more than 28 days unmodified, then most likely it's a leftover from when we upgraded to 0.2.0.8-alpha. Remove it. It has no good routers anyway.
o Minor bugfixes (directory authorities):
- Correct the implementation of "download votes by digest." Bugfix on 0.2.0.8-alpha.
- Make the "next period" votes into "current period" votes immediately after publishing the consensus; avoid a heisenbug that made them stick around indefinitely.
o Minor bugfixes (memory leaks):
- Stop leaking memory on failing case of base32_decode. Bugfix on 0.2.0.7-alpha.
o Minor bugfixes (misc):
- Make base32_decode() accept upper-case letters. Bugfix on 0.2.0.7-alpha.
o Code simplifications and refactoring:
- Remove support for the old bw_accounting file: we've been storing bandwidth accounting information in the state file since 0.1.2.5-alpha. This may result in bandwidth accounting errors if you try to upgrade from 0.1.1.x or earlier, or if you try to downgrade to 0.1.1.x or earlier.
更新日志：http://tor.eff.org/svn/trunk/ChangeLog
官网：http://tor.eff.org
v0.2.0.9 alpha for Windows - 官方下载：
点击这里下载文件
v0.2.0.9 alpha for Mac OS X 10.4&5 (Tiger) Universal Binary - 官方下载：
点击这里下载文件
v0.2.0.9 alpha for Linux 源文件 - 官方下载：(Linux/Unix 软件包)
点击这里下载文件
v0.1.2.17 Final for Windows - 官方下载：
点击这里下载文件
v0.1.2.17 Final for Mac OS X 10.4&5 (Tiger) Universal Binary - 官方下载：
点击这里下载文件
v0.1.2.17 Final for Mac OS X 10.3 (Panther) - 官方下载：
点击这里下载文件
v0.1.2.17 Final for Linux 源文件 - 官方下载：(Linux/Unix 软件包)
点击这里下载文件
绿盟下载：Tor for Windows
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