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.