| Summary: | 碩士 === 朝陽科技大學 === 資訊工程系碩士班 === 100 === In recent years, with the development of Internet technology and popularity of mobile devices, e-commerce applications have been more and more convenient. If the users proceed a higher amount of spending, the payment may be made by credit cards or e-checks. However, the two methods differ from each other. Online credit card payment is processed by entering the cardholder’s information; its disadvantage is the leak of information on the malicious websites so the future unauthorized payment will occur. And the shortcomings of using e-checks are the re-application of the e-check whenever it is used, and the necessity to have a secure channel to transmit the e-checks.
In the thesis, we design an e-check system built in the mobile device. We can set up bank agents in our mobile phones to manage the checks and prevent the unauthorized use of checks. By way of key agreement, it is assured that only the designated recipient can decipher the code and get the check information. And the signature is utilized to authenticate every participant''s identity.
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