一个能够抗击Sybil攻击的电子商务协议

尽管基于对等网络模式(P2P)的电子商务系统获得了巨大的成功,但是由于没有集中式的控制机制,所以容易受到sybil攻击和白洗(whitewashing)攻击.每个商家在购买货物时,总是希望从信任度高的商家进货.但是一些恶意的商家,可以虚构多个身份,进行虚假交易,任意提高自己的信任度.提出一个崭新的交易协议来限制Sybil和白洗攻击的能力.我们把商家间的历史交易关系映射为一个有向图,把评定商家信任度的问题转化为有向图中的最短路径问题.通过理论分析和数据仿真来评价该协议的性能.

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.