Processing module with function selection

摘要

A data processing module comprises a processor 21 for storing a plurality of function algorithms F0, F1 .... Fn and for executing a designated one of them; and a controller 22 for selecting one of the algorithms to be subsequently executed on the basis of all or part of a processing result Y. The selection may be deterministic or statistical and involve comparison of the result with externally-input data. The processing result may be converted, 23, by masking to provide an output Y'. The module may be one of a series used in compressing/encrypting data blocks.