第二代洋葱头路由匿名通信系统-Tor

Introduction of The Second Onion Routing Anonymous Communication System-Tor

Tor网络是目前Internet中最成功的公共匿名通信服务。首先简要概述了匿名通信和Tor网络的基本原理洋葱头路由。然后从三个方面对Tor网络进行了详细的阐述,具体为:Tor协议阐述了Tor的传输单元、通道构建机制和应有数据流传输机制;Tor网络的现状阐述了Tor网络目前的状态,包括用户和节点的分布情况,使用Tor网络服务的应用层协议情况和Tor网络的滥用情况;Tor未来发展面临的挑战,包括系统可用性的挑战、系统信誉度的挑战和系统抗滥用能力的挑战。

Tor is the most successful public anonymous communication service in the Internet.In this paper we begin with a brief overview of anonymous communications and onion routing.And then we describe Tor network in details in terms of Tor protocol,Tor network status and Tor network future challenges.In the section of Tor protocol we describe cell,circuit building protocol and application data flow transmission protocol.In the section of Tor network status,we describe the status of current Tor network including the distribution of Tor users and Tor nodes,application level protocol which is using Tor network service,and Tor network abuse.And in the section of Tor network future challenges,we describe the future challenges which is faced in the process of Tor developing including the challenges of system availability,the challenges of system credibility and the challenges of system anti-abuse ability.