Cryptology ePrint Archive: Report 2012/043

A novel Group Key Transfer Protocol

Chingfang Hsu and Bing Zeng and Qi Cheng and Guohua Cui

Abstract: Group key transfer protocols depend on a mutually trusted key generation center (KGC) to transport the group key to all group members secretly. This approach requires that a trusted sever be set up, and it incurs communication overhead costs. In addition, the existing group key transfer protocols based on secret sharing all use threshold schemes that need to compute a -degree interpolating polynomial to encrypt and decrypt the secret group key, then it increases the computational complexity of system. In this paper, we first present a novel group key transfer protocol without an online KGC, which is based on DH key agreement and a perfect linear secret sharing scheme (LSSS). The confidentiality of the group key transfer phase of this protocol is information theoretically secure, which is ensured by this LSSS. Furthermore, this protocol can resist potential attacks and also reduce the overhead of system implementation. Goals and security threats of our proposed group key transfer protocol will be analyzed in detail.

Category / Keywords: cryptographic protocols /

Publication Info: This paper has not been published elsewhere

Date: received 26 Jan 2012

Contact author: cherryjingfang at gmail com

Available formats: PDF | BibTeX Citation

Version: 20120130:050450 (All versions of this report)

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