Integrated circuit protected against horizontal side channel attack

摘要

The circuit (CIC2) has a coprocessor (CP2) comprising a randomized multiplier (SMT2) for executing an operation of multiplication of two binary words in a set of elementary steps of multiplication of components of one of the binary words by components of the other binary word. The multiplier executes two successive multiplications of the binary words by modifying, in a random or pseudo-random manner, an order in which the elementary steps of multiplication of components of the former binary word by the components of the latter binary word are executed. Independent claims are also included for the following: (1) a device comprising integrated circuit (2) a method for protecting an integrated circuit against a side channel analysis.