Differential Fault Analysis (DFA) is a differential fault analysis with which cryptographic algorithms of smart cards
or other encryption components are tested for their reliability. In the DFA process, errors are interspersed during encryption for test purposes. This can be, for example, a change in the supply voltage or the system clock. The error-manipulated test results are correlated with the correct results and show the resulting bit differences from which conclusions can be drawn about the encryption method and the secret key. The DFA method can be used to test all encryption algorithms.