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:
Dec. 07, 2021
Filed:
Dec. 18, 2018
Orange, Issy-les-Moulineaux, FR;
Olivier Sanders, Chatillon, FR;
ORANGE, Issy-les-Moulineaux, FR;
Abstract
A cryptographic method for signing a message m by a user device on behalf of a group managed by a group manager, which has a secret key generated from two variates x and y, the group having a public key formed from a plurality of elements comprising an element g and an element gz pertaining to a cyclic group of order p, p being a whole prime number and z a variate, and an element h, an element hx, an element h/z and an element hy/z pertaining to a cyclic group of order p. The method includes: receiving a certificate from the group manager, including elements Sgr, Sgr(x+y.u) and Sgz.r where r is a variate selected by the group manager for the user device; and generating a group signature for the message m, based on the certificate, a variate t generated by the user device, and the secret u.