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A New Secure Authenticated Group Key Transfer Protocol |
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| Authors: | Chingfang Hsu Bing Zeng Guohua Cui Liang Chen |
| Affiliation: | 1. Computer School, Central China Normal University, Wuhan, 430079, China 2. School of Software Engineering, South China University of Technology, Guangzhou, 510006, China 3. School of Computer Science and Technology, Huazhong University of Science and Technology, Wuhan, 430074, China 4. National Computer Network Emergency Response Technical Team/Coordination Center of China, Beijing, 100029, China |
| Abstract: | Group key transfer protocols depend on a mutually trusted key generation center (KGC) to generate group keys and transport group keys to all group members secretly. Generally, KGC encrypts group keys under another secret key shared with each user during registration. In this paper, we propose a novel secure authenticated group key transfer protocol using a linear secret sharing scheme (LSSS) and ElGamal cryptosystem, where KGC broadcasts group key information to all group members. The confidentiality of this transformation is guaranteed by this LSSS and ElGamal cryptosystem. We also provide authentication for transporting this group key. Goals and security threats of our protocol are analyzed in detail. |
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