Research On Censorship Resistance In Anonymous Network

In the rapid development of the “Internet plus", the way of people’s live,work and communication have been greatly improved. Although the Internet should give people greater freedom, but inevitably, due to the openness and complexity of the inernet, the online information is very difficult to control. While the internet promotes the dissemination of information and knowledge,at the same time, in order to control illegal and sensitive information wide spread on the Internet, the network censorship arises and develops.Aiming at different network censorship technologies, a series of anonymous censorship resistance systems and technologies are emerged. At the same time,anonymous censorship resistance has also been widespread concerned in academic circles. With the rapid development of anonymous censorship resistance technology,research on censorship resistance technology has very important application value.Firstly, comprehensively studied the network censorship technology and anonymous censorship resistance technology, including current study status of anonymous censorship resistance technique. Summarized and classified to the resistance technology from two aspects of the technical principle and anti-censorship ability.Secondly, this paper we proposes DTCS, a scheme of anonymous censorship resistance using traffic padding technology. In this part, we fiirst introduce the DTCS related technology such as Tor, StegoTorus, traffic padding and traffic forwarding strategy. Then we elaborate the design goal, threat model and framework of DTCS in detail.finally, according to the different traffic forwarding strategy and the distribution of traffic packets arriving, the evaluation criteria of traffic padding module in DTCS scheme is deduced, namely the padding error rate.Finally, we analyzed and discussed the code design of the critical modules in DTCS. According to the evaluation criteria, there are seven situations to evaluate the traffic padding module in the DTCS: Threshold Poisson Strategy, Timeed Poisson Strategy, Threshold Pareto Strategy, Timeed Pareto Strategy, Threshold Binomial Strategy,Timeed Binomial Strategy and pool Strategy. Then,we ananlyzed the influence of the parameters involved in each situation on padding error rate.