| Summary: | 碩士 === 國立政治大學 === 資訊科學學系 === 105 === As the coverage of mobile phone has been constantly increased in recent years, the mobile phones have become an indispensable tool in life. Many ways of lives are gradually done through the mobile terminals, for example: No longer need to find the way through the map or search information through the computer, people have also gradually turned to electronic payment via e-wallets instead of paying via physical wallets, such as AliPay in China. Adopting the mobile phone as a wallet is nowadays the main development direction of mobile phones. Meanwhile, people are paying more and more attention to the topics on the security of mobile payment than before. In recent years, under the protection of secure element, the security of users’ mobile phone has been enhanced to a certain extent. In the case of off-line transactions, malicious users are capable of fooling secure element and making double spending.
In 2016, Chen et al. proposed a NFC-Based anonymous mobile payment protocol. In that protocol the transaction can only be executed with the involvement of issuer. In this research, we introduce a new protocol which can support both on-line and off-line transactions. Our protocol is modified from that of Chen et al.’s idea.
In our protocol, to prevent a malicious user, we use a secure element which stores sensitive information that cannot be altered by the user. In this way, the cheating behavior of a malicious user can be prevented. On the other hand, by using the token techniques, the anonymity of a user can be achieved from the view of a merchant.
In this study, we focus on double spending which can make merchant a lot of cost at off-line transaction. We used hash chain to verify the correctness of transactions and prevent the double spending.
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