Method for executing computer financial transaction application in e.g. contactless smart card utilized in payment terminal, involves determining function data of execution context before utilizing function data by computer application

摘要

The method involves determining (E231) function data of a current execution context before utilizing (E240) the function data by a computer application, by executing an autonomous software patch that is external to the computer application and is triggered through a jump instruction, where the function data are stored in a rewritable non-volatile memory i.e. electrically EPROM. The determined function data are copied (E232) from a secondary memory region to a main memory region, using the software patch. The data are chosen from a group comprising momentary amount associated with payment facilities, personal identification number associated with users, and secret and dummy data associated with absence and detection of an attack on a smart card. Independent claims are also included for the following: (1) a processing device comprising an executing software environment (2) an information storage medium comprising instructions for performing a method for executing a computer application in a processing device (3) a computer program comprising instructions for performing a method for executing a computer application in a processing device.