Cartes à puce : Attaques et contremesures.

We present in this article our research dealing with faults attacks and logical attacks on smart cards, especially on Java Card. We introduce by presenting Java Card and its security mechanisms, then we present the types of attacks carried out on smart cards and we present some countermeasures for these attacks and in particular those faults attacks. And we finish with the presentation of our work on the tool of manipulation of a file format of Java Card and other proposals for countermeasures on faults attacks.