Enhancing Security and Robustness of P2P Caching System

At present, P2P caching system is widely used to reduce P2P traffic, but the security is always ignored. In this paper, we discuss three potential security issues: content poison, illegal files diffusion and malicious downloading. First, we propose content verification to ensure the correctness of data and defend against content poison attacks. Then, to prevent the spread of illegal files, we filter requests and responses by an info library and a feature library of known illegal files. Third, we present the strategies and introduce identity authentication to prevent malicious downloading from exhausting system’s resources. Based on these considerations, we implement a novel P2P caching system to evaluate our designs. According to the result and analysis, we believe our strategies can promote the security and robustness of P2P caching system.