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. 31, 2017
Filed:
Apr. 27, 2011
Luan Ibraimi, Eindhoven, NL;
Muhammad Asim, Eindhoven, NL;
Milan Petkovic, Eindhoven, NL;
Koninklijke Philips N.V., Eindhoven, NL;
Abstract
An attribute-based digital signature system comprises a signature generation unit () for signing a message (m) by generating a signature (σ) based on a user secret key (SK) associated with a set of user attributes, wherein the signature generation unit () is arranged for combining the user secret key (SK) with revocation data (R) to form at least part of the signature (σ), wherein the revocation data (R) complements respective ones of a plurality of valid user secret keys and wherein the revocation data (R) prevents a revoked user secret key (SK) from being used to validly sign a message (m) with the set of user attributes. The system further comprises a revocation unit () for selectively removing at least part of the signing capability of a to-be-revoked user secret key (SK), by generating updated revocation data (R), wherein the updated revocation data (R) is based on at least part of the to-be-revoked user secret key (SK). A plurality of attribute authoritiesmay independently issue cryptographic keys.