一种防破坏广播型匿名通信网的多路访问协议

针对Golle等提出的广播型匿名通信网络，设计了一种新的多路访问协议．将每个传送周期分为预约、确认和发送3个阶段，第1阶段采用随机预约映射技术对共享匿名信道进行公平分配，在第2阶段用匿名方式确认分配结果，而成员在第3阶段开始发送匿名消息，同时公布一个非交互式知识证明，以确认自己只在与确认结果一致的位置发送了匿名消息．所提协议可以保证成员绝对遵守分配规则，能有效防御破坏性拒绝服务攻击．利用该协议，不会损害通信系统的匿名性，并能显著提高匿名传输效率．仿真结果表明，在发送长匿名消息时，匿名信道利用率由原来的37％提高到了90％以上．

Disruption-Resistant Multi-Access Protocol for Broadcast Anonymous Communication Network

A novel multi-access protocol is designed for the broadcast anonymous communication network proposed by Golle et al.Every sending period is divided into reservation phase,confirmation phase and sending phase.A random reservation map technique is used for fair sharing of the common anonymous channel in the first phase.Then all participants are required to confirm the reservation results anonymously in the second phase.In the third phase everyone begins to send his anonymous messages,and simultaneously publishes a non-interactive knowledge proof to prove the fact that only in the positions consistent with the confirmation has he sent the anonymous messages.This protocol can guarantee absolute observation of the sharing rules by every participant and resist disruptive denial-of-service attacks effectively.This protocol doesn't impair communication system's anonymity and can notably improve its anonymous-transmission efficiency.Simulations show that the anonymous channel usage rate is raised from 37% to more than 90% when it works with long messages.