Security method and system for an integrated circuit, particularly a memory

摘要

The method involves applying electrical signals (IS0 - ISm) each representing a state of one of selected memory cells to memory cell read circuits supplying a binary output signal representing state of the cell to which it is linked. A rule to allocate the signals to the circuits is modified by applying a permutation to a part of the signals, so that each read circuit processes electrical signals of different ranks during different reading cycles. The rule is randomly or pseudo-randomly modified for every T reading cycles, where T is a constant or a variable integer greater than or equal to 1. An independent claim is also included for a memory comprising memory cells.