DES re Emulation Using Java Card

This paper presents a Java Card applet o ering the same functionality as a widely used contactless storage card. The goal is to provide a solution for secure and widely deployable data storage for smart phones. The applet provides an independent storage space for di erent applications with their own keys and con guration and is fully compatible with the MIFARE DES re Card EV1 technology. It can be installed in every Java Card 2.2.1 compatible Smart Card. Integration with Google Android phones is possible using a secure micro-SD card or other secure platforms that feature a JavaCard chip and a NFC antenna. The DES re emulator can be accessed both externally through NFC, or internally through the smart phone OS. In the last few years, the number of di erent electronic applications using secure elements have grown markedly. It is easy to take a look at things that are used day by day and nd that secure storage is needed for a big part of them. Credit cards, access control, public transport, supermarket vouchers... Curiously most of them are found in our wallets. On the other hand, mobile phones have been growing recently in the number of applications where they are used, increasing their value in our pockets. It has been found iteresting to move all this stu to our smart phone with the aim of reducing the number of things carried by the clients. Thus, a secure storage is needed in the smart phone to provide such a service. Up to now, each card within our wallet had its chip where the secure data was stored. Our credit for public phones, our vouchers for our