| 摘要 |
<p>A message is encrypted using a block-cipher algorithm to protect again Differential Power Analysis (DPA) attacks. Blocks of the message are combined with blocks of the key using the algorithm, but the order in which the blocks are combined is made to vary for each round or iteration of the encryption operation. Preferably, the combination order is chosen randomly for each round, and randomization of the order is achieved either using a physical random number generator (RNG) or a pseudo RNG using part of the encryption key as a seed value. For added resistance to DPA attacks, the encryption process can include "dummy" computations periodically through the encryption sequence to throw-off analysis of power consumption data.</p> |
