A Generic Protection against High-Order Differential Power Analysis

Di erential Power Analysis (DPA) on smart-cards was introduced by Paul Kocher [11] in 1998. Since, many countermeasures have been introduced to protect cryptographic algorithms from DPA attacks. Unfortunately these features are known not to be e cient against high order DPA (even of second order). In these paper we will rst describe new specialized rst order attack and remind how are working high order DPA attacks. Then we will show how these attacks can be applied to two usual actual countermeasures. Eventually we will present a method of protection (and apply it to the DES) which seems to be secure against any order DPA type attacks. The gures of a real implementation of this method will be given too.