Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Constructing UC Secure and Constant-Round Group Key Exchange Protocols via Secret Sharing | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2008 Article ID 271989 9 pages doi 2008 271989 Research Article Constructing UC Secure and Constant-Round Group Key Exchange Protocols via Secret Sharing Chunjie Cao 1 2 Chao Yang 1 Jianfeng Ma 1 and Sangjae Moon3 1 Key Laboratory of Computer Networks and Information Security Xidian University Xi an 710071 China 2 Research Institute of China Electronic Technology Corporation CETC Jiaxing Zhejiang 314033 China 3 Mobile Network Security Technology Research Center Kyungpook National University Daeyu 702701 South Korea Correspondence should be addressed to Chunjie Cao Received 10 June 2007 Revised 30 October 2007 Accepted 30 April 2008 Recommended by Mohamed Hossam Ahmed Group key exchange GKE is one of the basic building blocks in securing group communication. A number of solutions to GKE problem have been proposed but most of them are not scalable and require a number of rounds linear with the number of group members. We present a method of constructing constant-round and identity-based protocol via secret sharing for GKE within universally composability UC framework. The resultant protocol focuses on round efficiency and three rounds of communication are required. The protocol allows the batch verification of messages signed by all other group participants. Moreover compared with other identity-based protocols the key generation center KGC in our protocol is not always online. Copyright 2008 Chunjie Cao et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. INTRODUCTION In many modern group-oriented and distributed applications such as distributed simulation multiuser games and collaborative tools scalable and reliable group communication is one of the critical problems. .
