International Association for Cryptologic Research
Classical cryptanalysis generally considers adversaries getting black box access to the cryptographic primitives they target, e.g. the inputs and outputs of a block cipher. However, considering the practical implementations of a block cipher, especially in resource limited systems such as smart cards, there is a stronger attack model, namely the side channel attack model, where the adversary is given more power by having access to some limited information leaked about the internal state of the cipher. This information leakage can be via physical side channels, such as timing, electrical power consumption, electromagnetic radiation, probing, etc.