A Sybil-Resilient Protocol for e-Commence

Although P2P based e-Commence systems have a great success,they are susceptible to sybil attack and whitewashing attack due to without a central control mechanism. Every buyer tends to buy products from a vendor with high reputation.To enhance their reputation,some malicious vendors may create a large set of fake identities,arbitrarily set the value of transactions among them.We present a novel transaction protocol for limiting the capacity of sybil attack and whitewashing attack.We model history transactions relationship as a directed graph and rate providers as a shortest-paths problem.The performances of our protocol have been evaluated by both theoretical analysis and simulation.