Smart card for use in finance field, has current transforming block coupled to central processing unit, and generating amounts of dummy currents before and after amount of current consumed by corresponding security operations

摘要

The card has a central processing unit (CPU) for conducting security operations on data maintained by the smart card and generating rents indicative of the security operations. A current transforming block (70) is coupled to the unit, and generates amounts of dummy currents before and after an amount of current consumed by corresponding security operations. The block has a set of differently weighted dummy current circuits. Independent claims are also included for the following: (A) a method of controlling a smart card (B) a computer program product for a method.