The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 23, 2007
Filed:
Mar. 22, 2000
Jean-sébastien Coron, Paris, FR;
Jean-Sébastien Coron, Paris, FR;
Gemplus, Gemenos, FR;
Abstract
A countermeasure method in an electronic component implementing an elliptical curve based public key cryptography algorithm. A new decryption integer d' is calculated such that the decryption of an encrypted message on the basis of a private key d and the number of points n of an elliptical curve provides the same result with d′ as with d, by performing the operation Q=d*P, whereby P is a point of the curve. Four steps are employed in the calculation:) a security parameter s is determined,) a random number k ranging from 0-2is drawn,) the integer d′=d+k*n is calculated, and) Q=d′.P is calculated.
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