Optimization of transaction mechanism on Java Card

Abstract

Reliable update of data is very important on Java Card. Transaction mechanism ensures the data integrity on cards, but such transaction mechanism is very time consuming. Therefore, this paper presents an optimized transaction mechanism based on high object locality on Java Card. At first, we define the concept of object access and storage locality in applet transactions and then the transaction memory scheme based on hash table is designed for new value logging method. Secondly, we design the read and write access method for transactions based on access locality. At last, we optimize the commit process based on storage locality in order to reduce the number of EEPROM writing. The test results show that this optimized mechanism expands the transaction capacity and improves the execution speed of Java Card applets. © 2011 Springer-Verlag.