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Reputation management in a Peer-To-Peer network is difficult as challenges are posed by lack of centralized authority. For this reason P2P (Peer-To-Peer) network is vulnerable which can facilitate non-cooperation, cheating, leaching on the network and propagation of malicious code. The security model used for centralized C/S systems is not suitable for P2P networks as it is centralized in nature. The security challenges in the P2P networks are secure reputation data management, availability of reputation data, Sybil attacks and identity management of peers. This paper presents a new protocol based on cryptography which ensures timely availability of reputation data, at low cost, to other peers and security.
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