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New and efficient conditional e-payment systems with transferability
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DOI：10.1016/j.future.2013.07.015.png)
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Abstract
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Conditional e-payments (or e-cash) allow the user to anonymously cash a bank-issued e-coin at a future time if and only if a certain agreed-upon public condition is satisfied, which are useful in plenty of applications such as prediction markets, anonymous online betting, and securities trading. In this paper, we propose a new and efficient conditional e-payment system based on Chen et al.'s restrictive partially blind signature scheme. Compared to the existing conditional e-payment schemes [2,5,6], our construction requires neither the inefficient cut-and-choose techniques nor the complicated knowledge proof protocols and thus has lower computation and communication complexity. Another significant contribution of this paper is a conditional e-payment system with transferability which allows the coin to be further transferred anonymously by a chain of payees. (C) 2013 Elsevier B.V. All rights reserved.
Keywords:
Conditional e-payment
Blind signatures
Transferability
Bilinear pairings
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