有半信任方(STNP)的多方交换协议

摘要

Frankin和Tsudik在FC＇98中给出了两个多方交换协议，此协议是关于多方交换的公平交换协议，本文发现了对其中第一个协议(SUCEX-1)的攻击，指出该协议是一个不公平交换协议，并给出了此协议的一种改进形式。%In FC'98,Frankin and Tsudik Proposed two protocols for n-party multi-unit fair exchange. In this paper, an attack on its protocol SUCCX-1 is presented,and in the meanwhile,an improved protocol is given.