PROTECTED SMART CARD

摘要

Smart cards are cards which control the execution of their own transactions, so as to avoid providing specialised card readers for each type of transaction. The protected smart card system (1) of the invention is a smart card storing a transaction management programme (13) written in a high-order language requiring interpretation by a command interpreter (12) through a basic operating system (10) with systems for protecting memory access. Hence, an unauthorised user cannot interfere with the integrity of a transaction, since he can only access the smart card through the high-order language, and the high-order language commands which he might divert would necessarily be intercepted by the command interpreter (12) and by the protection systems of the basic operating system (10).