Patent · US Expired

Protected cryptographic calculation

US7983414B2 · kind B2 · utility

1Cited by

15References

20Claims

0Family size

Assignee

GIESECKE & DEVRIENT GMBH · DE

Inventors

Markus Bockes · Munich, DE
Hermann Drexler · Munich, DE
Helmut Kahl · Berlin, DE

Key dates

Filing date	Sep 9, 2003
Grant date	Jul 19, 2011
Priority date	—
Expiry date	Oct 11, 2025

Classification

Technology area (CPC H)Electricity
CPC primaryH04L2209/04
WIPO fieldDigital communication
WIPO sectorElectrical engineering

Abstract

In a method for protected execution of a cryptographic calculation in which a key with at least two key parameters is drawn on, an integrity check of the key is performed, in order to prevent a cryptographic attack in which conclusions are drawn as to at least one second key parameter by corrupting at least one first key parameter. A further method serves to determine a key for a cryptographic calculation with at least two key parameters provided for use in the first-mentioned method. A computer program product and a portable data carrier have corresponding features. The methods enable particularly good protection of cryptographic calculations against attacks.

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