Toplogy Analysis And Anonymity Assessment On Anonymous P2P Networks

As the Internet is becoming a virtual platform for people’s sharing information and communicating daily, more and more people are connected together and the contact area between their personal privacy and the outside world turns to be unprecedented large. Therefore, the users of the Internet are faced with an enormous privacy threat. With the improvement of Information and Communication Supply Chain’s strategic position in many countries, the information leakage threat, the system integration threat and the asymmetry of cyberspace threat come into more and more people’s notice. With the informatization of physical world, Cyber Physical System is born at the right moment, which aims at realizing the highly fusion of cyber space and the physical world. Though CPS makes the action in physical world more real-time and more intelligent, at the same time, it brings a threat that an attacker could cause destruction in the physical world through launching an attack in the cyber space. Anonymous P2P technology is a good way to solve the above problems. The ultimate goal of all anonymous P2P systems is to obtain the anonymity. Anonymity assessment on different anonymous P2P systems can be used to compare the amount of anonymity offered by different systems or to adjust the parameter setting of the same system according to different need, which is of great guiding significance to improve anonymous communication systems. In this background, this paper maily does the following research:Firstly, this paper describes the principles of different anonymous communication mechanism and the most representative examples of anonymous Mix protocols and anonymous P2P protocols. Based on an analysis on the traditional P2P network topology, this paper introduces the anonymous P2P network topology.Secondly, this paper shows the definition of anonymity in different mathematical fields, makes a survey of the existing anonymity assessment methods and sorts out a comprehensive theoretical framework for anonymity assessment on anonymous communication systems.Finally, from the angle of relationship anonymity between the sender and the receiver, this paper presents the BIG-MIX anonymity method, taking the paths cross of different messages into consideration, to make anonymity assessment on anonymous P2P networks with the use of mapping. Adopting this method, this paper makes a quantitative analysis on the relationship anonymity of anonymous P2P networks under the mechanism of Threshold Mixes, Timed Mixes or Pool Mixes.