Cryptographic unit for recognition of fault attacks, i.e. first threat for implementation of cryptographic algorithms, e.g. advanced encryption standard (AES)

摘要

Unit has first processor (S) determining output signal (Y), based on AES algorithm, and first comparison signal (V). A second processor (S 1) determines second comparison signal (V') and release unit for delivering output signal. Release unit is designed to carry out defence against external attack on output signal, when there is preset relation of both comparison signals, while first comparison signal is determined in different manner with respective second comparing signal for easy fault recognition. Independent claims are included for ; (1) operating method of cryptographic unit; (2) computer program.