Résumé
Electromagnetic Aattacks hve been recently identified as an efficient technique to retrieve the secret key of cryptographic algorithms. Although similar mathematically speaking, Power or Electromagnetic Attacks have different advantages in practice. Among the advantages of EM attacks, the feasibility of attacking limited and bounded area of integrated systems is the key one. However, efficient techniques are required to localize hot spots, characterized by partially data dependent electromagnetic emissions, at which DEMA may be applied with success. This paper aims at introducing a pragmatic technique to localize quickly and efficiently these points of interest.