Patent · US Active

Cryptographic unit and method for operating a crytographic unit

US7694156B2 · kind B2 · utility

25Cited by

1References

22Claims

0Family size

Assignee

Infineon Technologies AG · DE

Inventors

Berndt Gammel · Borgo San Lazzaro, DE
Holger Bock · Munich, DE
Michael Goessel · Roter Dudel, DE

Key dates

Filing date	Dec 23, 2005
Grant date	Apr 6, 2010
Priority date	—
Expiry date	Nov 26, 2028

Classification

Technology area (CPC H)Electricity
CPC primaryH04L2209/12
WIPO fieldDigital communication
WIPO sectorElectrical engineering

Abstract

A cryptographic unit includes a first processing unit for determining an output signal on the basis of the AES algorithm and for determining a first comparison signal, a second processing unit for determining a second comparison signal, and a release unit for providing the output signal, wherein the release unit is designed to perform a defense measure against an external tapping of the output signal when the first comparison signal is not related to the second comparison signal in a predetermined relationship. The first comparison signal is determined in a different way as compared to the second comparison signal, so that, in the case of the injection of faults into the cryptographic unit, these faults may be detected very easily.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.