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With the rapid development of the Internet and information technology, electronic commerce system is flourishing. In electronic commerce, customers use electronic money (e-money) instead of cash. E-money in wide use includes electronic cash, electronic checks, electronic coupons, and so on. E-money is fixed at face-value and is backed by banks. The fact that e-money is not issued in the actual amount to be used, it is somewhat inconvenient for customers to use. In addition, security requirements consume huge amounts of computing resources. Limited computing capability makes it is difficult to engage in electronic commerce with mobile devices.
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