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Freegate is a software application developed by Dynamic Internet Technology (DIT) that enables internet users from mainland China, North Korea, Syria, Iran, Vietnam, and the United Arab Emirates, among others, to view websites blocked by their governments. The program takes advantage of a range of proxy servers called Dynaweb. This allows users to bypass Internet firewalls that block web sites by using DIT's P2P-like proxy network system.〔 FreeGate's anti-censorship capability is further enhanced by a new, unique encryption and compression algorithm in the versions of 6.33 and above.〔http://www.internetfreedom.org/FreeGate〕 Dynamic Internet Technology estimates Freegate had 200,000 users in 2004.〔 The maintainer and CEO of DIT is Bill Xia. == Dynaweb == DynaWeb is a collection of anti-censorship services provided by Dynamic Internet Technology Inc. (DIT). DynaWeb is a web-based anti-censorship portal. Once users point their web browser at one of the DynaWeb URLs, a web page will be presented similar to the original, with most blocked websites as links. In addition, a user can type in any URL in the box on this page and DynaWeb will fetch the pages for him or her instantly. No software is needed, nor are any settings tweaked on a user’s computer. Since the Chinese net police watch DynaWeb’s portal websites closely and block them as soon as they identify them, DynaWeb must be dynamic. It has hundreds of mirror sites at anytime, and each with a varying IP and DNS domain names to defeat IP blocking and DNS hijacking. On the backend, DynaWeb also has mechanisms to proactively monitor the blocking status of each of its mirror sites, and as soon as blocking is detected, it will change the IP and DNS domain name instantly.〔 To keep users connected to such a dynamic infrastructure, DynaWeb has a variety of channels to keep users updated. For example, a user can send a message to one of DynaWeb’s instant messenger (IM) accounts, and will get an instant reply showing the newest addresses of DynaWeb portals. Similar things are being done with emails. By these many, dynamic channels, DynaWeb outsmarts any attempt to collect all DynaWeb addresses by the censors, because each user receives only a (different) subset of DynaWeb’s addresses. Automatic blocking detection combined with quick reaction apparently frustrates the blocking efforts on the China side of the Great Firewall of China (GFW).〔 DIT also releases a tiny piece of software, FreeGate, which directly taps into DynaWeb’s backbone and keeps a user connected to the dynamic channels automatically. There are indications that FreeGate has some capabilities built-in to exploit some zero-day vulnerabilities of the GFW.〔 Today DynaWeb offers the widest range of options for users to access Internet freely, and supports more than 50 million web hits per day on average from Chinese users alone.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Freegate」の詳細全文を読む スポンサード リンク
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