Encoding process for confidential data transmission includes counter measure introducing random element into constant tables to enhance encryption

摘要

The system uses a random choice of table in encoding the data. The electronic component puts into effect a cryptographic algorithm using a secret key (K). The operation of the algorithm comprises the use of a first constant table (TC0) in order to provide output data (S) with respect to input data (E). The output data and/or the derived data are manipulated by the use of critical instructions. A counter-measure system is provided by the use of other constant tables (TC1), so that the output data and the derived data are un-predictable. The use of different constant tables (TC0, TC1) is managed by a statistical law of chance, with a probability of a half for each.