VoIP系统中用户加密认证中心的构建及实现

为了解决基于流媒体加密系统中的用户身份认证和私钥分发问题，提出了把传统的PKI的思想融合到IBE系统，引入了认证中心，使用了公钥证书的概念，为用户私钥的传输建立了安全信道。该方案不但解决了用户私钥安全发放的问题，而且提高了系统的安全性能，大大减少了认证的次数和系统的计算量与通信开销。

Design and Implementation of Cryptographic and Certificate Authority Center for User in VoIP System

To authenticate the identity and distribute the private keys of users based on the stream media cryptographic system, a new scheme is proposed by integrating the idea of traditional PKI into IBE system, certificate authority and the concept of public-key certificate are used in the new scheme to set up the secure channel for transmitting the private keys. The private key distribution problem is addressed in the new scheme, and the secure performance of the system is improved. At the same time, the number of authentications decreases significantly, and the calculation amounts and communicative expenses of the system reduce.