A trusted multi-party authentication scheme based on proactive-ElGamal threshold secret sharing system

YANG Yuguang; CHAI Haiping

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A trusted multi-party authentication scheme based on proactive-ElGamal threshold secret sharing system

YANG Yuguang 1 *,CHAI Haiping 2 #

1.College of Computer Science and Technology, Beijing University of Technology, Beijing 100124

2.State Key Laboratory of Integrated Services Network, Xidian University, Xi\'an 710071,China

*Correspondence author

#Submitted by

Subject:

Funding: Beijing Natural Science Foundation （No.Grant Nos. 4122008, 1102004）, The Specialized Research Fund for the Doctoral Program of Higher Education （No.Grant Nos. 20091103120014, 20090005110010）, The National Natural Science Foundation of China （No.Grant Nos. 61170270, 61003290）

Opened online:21 March 2012

Accepted by: none

Citation: YANG Yuguang,CHAI Haiping.A trusted multi-party authentication scheme based on proactive-ElGamal threshold secret sharing system[OL]. [21 March 2012] http://en.paper.edu.cn/en_releasepaper/content/4471290

In most existing authentication schemes users are authenticated by the server one by one which results in lower efficiency of authentication when the number of users is large. Aiming at the drawback, we propose an efficient trusted multi-party authentication scheme based on threshold secret sharing, the discrete logarithm problem and ElGamal cryptosystem. Using (t,n) threshold secret sharing idea, we propose a (t,n) threshold authentication scheme which can not only simultaneously authenticate t users satisfying some specific conditions, but also authenticate new users dynamically by distributing a new authentication key for the new user which was produced by t old users and the new user together. Finally, the security and efficiency of the proposed scheme are analyzed.

Keywords:Information Security; Authentication; Threshold secret sharing; ElGamal cryptosystem; Discrete logarithm

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