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:
Jan. 10, 2023
Filed:
May. 26, 2021
Idemia France, Courbevoie, FR;
Christophe Giraud, Pessac, FR;
Emmanuelle Dottax, Talence, FR;
Other;
Abstract
A cryptographic method is provided. The cryptographic method comprises an initialisation phase for determining a provisional generator point G' equal to a first product G′=[d′]G, where d′ is a first random scalar forming a secret key of N bits and G is a generator point of an elliptical curve, and determining a provisional key Q′ equal to a second product Q′=[d′]Q, where Q is a point of the elliptical curve forming a public key. During an encryption phase a second random scalar forming a second secret key k of M bits, with M<N; a public key P is calculated such that P=[k]G′; a coordinate of an intermediate point SP, of the elliptical curve, equal to a fourth product SP=[k]Q′; at least one key by application of a derivation function (F); and data (T) are encrypted based on said at least one key.