Publication number: 20060050868
Abstract: In a method for protected execution of a cryptographic calculation in which a key (12) with at least two key parameters (p, q, pinv, sp, dp, sq, dq) is drawn on, an integrity check (30, 34, 40, 54) of the key (12) is performed, in order to prevent a cryptographic attack in which conclusions are drawn as to at least one second key parameter (p, q, pinv, sp, dp, sq, dq) by corrupting at least one first key parameter (p, q, pinv, sp, dp, sq, dq). A further method serves to determine a key for a cryptographic calculation with at least two key parameters (p, q, pinv, sp, dp, sq, dq), provided for use in the first mentioned method. A computer program product and a portable data carrier have corresponding features. The invention enables particularly good protection of cryptographic calculations against attacks.
Type:
Application
Filed:
September 9, 2003
Publication date:
March 9, 2006
Inventors:
Markus Bockes, Hermann Drexler, Helmut Kahl