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. 25, 2022
Filed:
Dec. 06, 2017
Gemalto SA, Meudon, FR;
Mariya Georgieva, Meudon, FR;
Aline Gouget, Meudon, FR;
GEMALTO SA, Meudon, FR;
Abstract
The present invention relates to a method of generating a secure RSA key by a server comprising the steps of: •generating (S) a private RSA key d and a RSA modulus integer N; •splitting (S) the secret key integer d in j key shares dof length n, with j in [1, J], J being an integer, and such that d=d+d+ . . . +dmod phi(N), with each key share dbeing equal to (d. . . d. . . d) with each key share component djin {0 . . . 2{circumflex over ( )}b−1} and i in [0, n/b−1], b being an integer inferior to n and phi the Euler's totient function; •encrypting (S) with a fully homomorphic encryption (FHE) algorithm each key share component dof the private RSA key d by using a Fully Homomorphic Encryption secret key pof a set Scomprising the index couple (i,j), to generate an encrypted key share component edof said secure RSA key, said set Sbeing a set of integer couples, among a predetermined integer number u of disjoint sets {S, SS, S, . . . S} generated such that: U{S}={(i,j) such that i in [0, n/b−1], j in [1, J]} and each said set among {S, . . . S} being associated with a Fully Homomorphic Encryption (FHE) secret key.