基于椭圆曲线的多服务组播接入控制方案

以多服务组播为研究背景，研究组播的层次接入控制技术．首先，描述了多服务组播通用的业务模型，并提出一种基于多维层次树的组密钥管理模型，将不同服务子组有机地集成在一起，以实现对多种组播业务的统一管理．其次，提出一种椭圆曲线的组密钥机制，证明了组密钥机制的安全性．最后实现基于椭圆曲线的多维层次树密钥管理算法．安全性分析证明算法能保证组播系统的安全．效率分析和实验结果表明：与已有方案相比，算法的时间效率和带宽效率提高2～3倍，具有较好的健壮性和可扩展性．

Elliptic curve cryptosystem based scheme of hierarchical access controlling for multi-service multicast

Hierarchical access control of multicast was studied against the background of multi-services multicast.Firstly,general service model of multi-service multicast was described,and a multidimensional hierarchical tree(MHT) based group key management model is presented to integrate all subgroups of services,which can achieve concentrative management of several services.Then,a group key mechanism based on elliptic curve cryptosystem(ECC) is proposed,and which secrecy is proved.Finally,a MHT based group key management algorithm using the ECC is illuminated.Secrecy analysis proves that it can assure secrecy for multicast system.Efficiency analysis and test result show that it can improve efficiency of time cost and bandwidth two or three times than previous works,also more expandability and scalability.