Advanced Reputation Management and P2P Networks
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Abstract
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. The approach is to encapsulate the past behavior of the peer in its digital reputation and then envisaging its actions pertaining to future. Thus a peer’s reputation prevents it from doing malicious activities. The protocol is capable of countering Sybil attacks. More over the cryptographic protocol is with features like identity management with the help of cryptographic mechanisms and self certification. The results in the form of simulations reveal that the new cryptographic protocol is secure and efficient in a decentralized peer – to – peer network.
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Keywords: Reputations, Identity Management, P2P networks, security, distributed systems.
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