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Journal of Information Science and Engineering, Vol. 34 No. 1, pp. 171-192

An Off-Line Payment Scheme for Digital Content via Subliminal Channel

School of Computer Science and Software  
Tianjin Polytechnic University  
Tianjin, 300387 P.R. China
E-mail: baoyuankang@aliyun.com; {463189225; 352427284}@qq.com 

    Now, more and more people have been purchasing digital contents through e-com- merce. So, secure payment schemes are important issue. In a traditional electronic payment scheme there are three participants, a customer, a shop and a bank. To solve fairness and ownership issue, an arbiter is also needed. Recently, Chen et al. proposed a fair online payment system for digital content via subliminal channel and claimed that their scheme satisfies not only unforgeability and anonymity but also fairness and legal owner arbitration. Once demand, the arbiter can solve the fairness issue, and judge the ownership from the subliminal message provided by the customer. But in this paper, we point out that Chen et al.’s scheme is subjected to some attacks on anonymity, fairness and the customer’s private key. Furthermore, combining techniques of blind signatures and verifiably encrypted signatures, we propose a fair off-line payment scheme for digital content via subliminal channel. In many respects we discuss the security, and show the formal proofs of unforgeability and anonymity of the proposed scheme. The comparisons show that the proposed scheme needs low computation and communication cost.

Keywords: electronic payment, fair exchange, anonymity, digital content, cryptography

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