ECC Protections against both Observation and Pertubation Attacks

International audienceTwo types of physical attacks are considered as important threats for embedded crypto-processors: observation attacks (or side channel attacks) and perturbation attacks (or fault injection attacks). In this work, we focus on protections against both types of attacks simultaneously for scalar multiplication in elliptic curve cryptography (ECC). A common protection against fault attacks on ECC is to verify if the current egular scalar multiplication using verifications at various frequency checking for some coordinate types. To protect the scalar, we added various methods based on iteration counters. We combined and tested these two countermeasures on different coordinates types for Weierstrass curves