Secure Key Transfer Protocol Based on Secret Sharing for Group Communications

Chia-Yin LEE  Zhi-Hui WANG  Lein HARN  Chin-Chen CHANG  

IEICE TRANSACTIONS on Information and Systems   Vol.E94-D   No.11   pp.2069-2076
Publication Date: 2011/11/01
Online ISSN: 1745-1361
DOI: 10.1587/transinf.E94.D.2069
Print ISSN: 0916-8532
Type of Manuscript: INVITED PAPER (Special Section on Information and Communication System Security)
key transfer protocol,  group key,  Diffie-Hellman key agreement,  secret sharing,  

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Group key establishment is an important mechanism to construct a common session key for group communications. Conventional group key establishment protocols use an on-line trusted key generation center (KGC) to transfer the group key for each participant in each session. However, this approach requires that a trusted server be set up, and it incurs communication overhead costs. In this article, we address some security problems and drawbacks associated with existing group key establishment protocols. Besides, we use the concept of secret sharing scheme to propose a secure key transfer protocol to exclude impersonators from accessing the group communication. Our protocol can resist potential attacks and also reduce the overhead of system implementation. In addition, comparisons of the security analysis and functionality of our proposed protocol with some recent protocols are included in this article.