METHOD AND APPARATUS FOR BALANCED ELECTRONIC OPERATIONS

摘要

As microprocessors and other electronic devices become faster and employ higher component densities, the noise generated by the transitions between data states has an increasing influence on the performance and security of these devices. Calculations and processes performed with the method of the invention will have a constant number of bit transitions, so ground bounce and similar effects are minimized. In the preferred embodiment, this is done by replacing leaky software processes with lookup tables filled with output data corresponding to outputs of a software process indexed with corresponding operand values. The invention is particularly useful in smart card implementations using DES (data encryption standard) protection, which may be cracked by monitoring the power signature while data is being processed.