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Journal of Inforamtion Science and Engineering, Vol.18 No.1, pp.107-114 (January 2002)

An Anonymous Endorsement System

Wei-Chi Ku and Sheng-De Wang
Department of Electrical Engineering
National Taiwan University
Taipei, 106 Taiwan
E-mail: sdwang@hpc.ee.ntu.edu.tw

The expression of ones opinion through endorsement is one of the simplest methods of democratic participation. The result of an endorsement can be used to evaluate whether a certain subject should deserve a higher attention. In some cases, the endorsers desire privacy protection. However, conventional paper-based endorsement systems provide neither convenience nor well privacy protection for the endorsers. In addition, current electronic anonymous voting schemes are unsuitable for anonymous endorsement. This motivates us to develop an anonymous endorsement system that can be realized on computer networks. The proposed system satisfies completeness, soundness, privacy, unreusability, eligibility, and verifiability. In practice, the proposed system can be integrated with the conventional paper-based endorsement system.

Keywords: anonymous endorsement, privacy, security, digital signature, untraceable email system

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Received May 15, 2000; revised August 14, 2000; accepted September 26, 2000.
Communicated by Chi Sung Laih.