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Journal of Electrical and Computer Engineering
Volume 2016 (2016), Article ID 2750268, 7 pages
http://dx.doi.org/10.1155/2016/2750268
Research Article

Analysis and Improvement of Key Distribution Scheme for Secure Group Communication

1Department of Information and Telecommunication Engineering, Ming Chuan University, Taoyuan 333, Taiwan
2Department of Information and Computer Engineering, Chung Yuan Christian University, Taoyuan 320, Taiwan

Received 16 November 2015; Accepted 2 March 2016

Academic Editor: Isao Echizen

Copyright © 2016 Jia Ning Luo and Ming Hour Yang. 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.

Abstract

In a secure group communication, messages between a group coordinator and members are protected by session keys. If a group’s membership changes, the session keys should be updated to insure forward secrecy and backward secrecy. Zhou and Huang proposed a key-updated scheme based on ciphertext-policy attribute encryption algorithm to improve the security of key-update mechanism, but their scheme is vulnerable: a malicious group member may send forged key-update messages to control the group. In this paper, we analyze the vulnerability in Zhou and Huang’s scheme and propose an enhanced scheme. In our scheme, only the group initiator can update group keys and the verification of key-update mechanism is improved to prevent malicious insiders from controlling the group. We also give a security and performance analysis of our scheme.