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:
Jul. 26, 2016
Filed:
Aug. 22, 2011
Muhammad Asim, Eindhoven, NL;
Milan Petkovic, Eindhoven, NL;
Muhammad Asim, Eindhoven, NL;
Milan Petkovic, Eindhoven, NL;
Koninkijke Philips N.V., Eindhoven, NL;
Abstract
An attribute-based digital signature system is disclosed. A first signature generating unit () is used for generating a first signature () for a document (), based on a first signature key () and the document (). A re-signing unit () is used for generating a second signature () for the document (), based on the first signature () and a re-signing key (), wherein the re-signing unit () is arranged for handling attributes () associated with the first signature () and/or the second signature (). The second signature () is associated with a second set of attributes () determined by the re-signing key (), wherein the second set of attributes () comprises a plurality of attributes. The first signature () is associated with a first set of attributes (), wherein the first set of attributes () comprises a plurality of attributes, and the re-signing unit () is arranged for generating the second signature () only if the first set of attributes () satisfies a set of conditions ().