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:
May. 15, 2018
Filed:
Jun. 16, 2016
International Business Machines Corporation, Armonk, NY (US);
Vadim Lyubashevsky, Zug, CH;
Gregory Neven, Oberrieden, CH;
International Business Machines Corporation, Armonk, NY (US);
Abstract
Methods and systems are provided for authenticating a message μ, at a user computer of a group signature scheme, to a verifier computer. The method includes, at the user computer, storing a user id m for the user computer and a user signing key which comprises a signature on the user id m under a secret key of a selectively-secure signature scheme. The user id m is an element of a predetermined subring, isomorphic to[x]/(g(x)), of a ring R=[x]/(f(x)), where f(x) and g(x) are polynomials of degree deg(f) and deg(g) respectively such that deg(f)>deg(g)>1. The method includes, at the user computer, generating a first cryptographic proof Πcomprising a zero-knowledge proof of knowledge of the user signing key and including the message μ in this proof of knowledge. The user computer sends the message μ and a group signature, comprising the first proof Π, to the verifier computer.