A novel electronic cash system with trustee-based anonymity revocation from pairing

Authors:
Yalin Chen;Jue-Sam Chou;Hung-Min Sun;Ming-Hsun Cho
Affiliations:
National Tsing-hua University, 101, Section 2, Kuang-Fu Road, Hsinchu, Taiwan;Nanhua University, No. 55, Sec. 1 Nanhua Rd., Zhongkeng, Dalin Township, 62248 Chiayi County, Taiwan;National Tsing-hua University, 101, Section 2, Kuang-Fu Road, Hsinchu, Taiwan;Nanhua University, No. 55, Sec. 1 Nanhua Rd., Zhongkeng, Dalin Township, 62248 Chiayi County, Taiwan
Venue:
Electronic Commerce Research and Applications
Year:
2011

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Abstract

Untraceable electronic cash is an attractive payment tool for electronic-commerce because its anonymity property can ensure the privacy of payers. However, this anonymity property is easily abused by criminals. In this paper, several recent untraceable e-cash systems are examined. Most of these provide identity revealing only when the e-cash is double spent. Only two of these systems can disclose the identity whenever there is a need, and only these two systems can prevent crime. We propose a novel e-cash system based on identity-based bilinear pairing to create an anonymity revocation function. We construct an identity-based blind signature scheme, in which a bank can blindly sign on a message containing a trustee-approved token that includes the user's identity. On demand, the trustee can disclose the identity for e-cash using only one symmetric operation. Our scheme is the first attempt to incorporate mutual authentication and key agreement into e-cash protocols. This allows the proposed system to attain improvement in communication efficiency when compared to previous works.