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. 01, 2002
Filed:
Aug. 24, 1999
Applicant:
Inventors:
David M'Raihi, Paris, FR;
David Naccache, Paris, FR;
Assignee:
Gemplus, Gemenos, FR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04L 9/30 ;
U.S. Cl.
CPC ...
H04L 9/30 ;
Abstract
The invention features a public key cryptography method based on the discrete logarithm which computes a value G mod p. Two solutions are proposed to reduce the number of multiplications, one consisting in generating “hollow” k exponents with a few bits of value 1, but of sufficient length to maintain the total security of the system, and the other consisting of performing calculations of the powers of g in parallel while combining the exponents with each other in order to prevent repeating the same power computations twice for a given exponent. The invention is useful for generating digital signatures, authentication and encryption.