Method for protecting cryptographic procedures against attacks through current and electromagnetic radiation measurements, comprises random selection of second group isomorphic to first group

摘要

Electronic components executing a cryptographic algorithm based on calculating a point on an elliptical curve E(K) on a body K may be protected from current and electromagnetic radiation measurement attacks by random selection of a body K' isomorphic to K, determination of the isomorphism and calculation of points A' on E'(K'), B equal to A' on curve E'(K') and C on E(K) using the inverse of the random isomorphism relationship