本文调查的办法是给出了一个方法，即一个有效的协议，为双方使用不受信任的第三方，可用于构建一个高效率的同辈对同辈安全的多方协议。-This paper investigates ways to give a method, that is a valid agreement for both parties to use an untrusted third party can be used to build a high-efficiency multi-protocol peer-to-peer security.