An RSA-based (t, n) threshold proxy signature scheme with freewill identities

Authors:
Ya-/Fen Chang;Chin-/Chen Chang
Affiliations:
Graduate Institute of Accounting, National Chung Hsing University, Taichung 402, Taiwan ROC./ Department of Computer Science and Information Engineering, National Taichung Institute of Technology, ...;Department of Information Engineering and Computer Science, Feng Chia University, Taichung, Taiwan 40724, ROC./ Department of Computer Science and Information Engineering, National Chung Cheng Uni ...
Venue:
International Journal of Information and Computer Security
Year:
2007

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Abstract

Hwang, Lu and Lin (2003) proposed a (t, n) threshold proxy signature scheme, based on the RSA cryptosystem. Later, Wang et al. (2004a) indicated that this scheme was insecure because the original signer's private key could be derived. Moreover, the delegates' identities had to be chosen carefully. In this paper, we propose an improved RSA-based (t, n) threshold proxy signature scheme, which withstands this security flaw and also offers the convenience of choosing identities at will.