Universally Composable Group Key Exchange Protocol
Jia Hong-yong①③; Qing Si-han②; Gu Li-ze①; Yang Yi-xian①
①Information Security Center, State Key Laboratory of Networking and Switching Technology, Beijing University of Posts and Telecommunications, Beijing 100876, China; ②Institute of Software, Chinese Academy of Science, Beijing 100190, China;③Institute of Electronic Technology of PLA Information Engineering University, Zhengzhou 450004, China
Abstract:In this article, a universally composable group key exchange ideal function is proposed and realized using witness indistinguishable proof of knowledge with partially isolated party based on the tamper-proof hardware token. Compared with protocols under the CRS model, the group key exchange protocol can greatly reduce the risk of putting all trusts in one place. The protocol is proved to be AKE secure and resistant to the attacks of adaptive adversaries and malicious insiders.