摘要
流媒体分发的一种典型实现方法是采用具有接收方驱动拥塞控制机制的分层组播.由于目前分层组播拥塞控制协议缺乏对用户行为的限制,接收方可违规订阅上层组播组发起自利型攻击,导致非公平的带宽利用.本文提出了一种较通用的安全分层组播协议SLM(S ecu re L ayered M u lticast).在路由器辅助拥塞控制条件下,在边界路由器采用基于Sham ir秘密共享体制的拥塞状态相关访问控制(CR-AC,C ongestion sta te R e la ted A ccess C on tro l)算法,管理用户组订阅行为,避免了用户自利型攻击,并使服务提供商可根据其与用户的协约限定不同用户的最高订阅级别.分析和仿真实验表明,该协议可实时保证网络流量安全共享带宽并具有较好的可扩展性.
Layered multicast with receiver driven congestion control is a typical way for media stream distribution. The congestion control protocols in current layered multicast methods lack the limitations to users＇ behaviors. The receivers may violate the protocol regulations and join upper groups to initiate self-beneficial attacks, which leads to unfair bandwidth usage. This paper presents a general secure layered multicast protocol, SLM. On condition that the routers can assist with congestion control,CR-AC （Congestion state Related Access Control） algorithm based on Shamir＇s secret sharing scheme is used in edge routers to regulate the users＇ group subscription behaviors and avoid their self-beneficial attacks. And different users can be confined to different highest subscription levels according to their agreements with service providers. Analysis and simulation results show that SLM can ensure the network flows share the bandwidth safely in real-time, and has preferable scalability features.
出处
《电子学报》
EI
CAS
CSCD
北大核心
2006年第3期413-418,共6页
Acta Electronica Sinica
基金
国家863信息技术领域重大专项项目(No.2003AA103510)
