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:
Sep. 15, 2009
Filed:
Oct. 24, 2007
Craig B. Gentry, Mountain View, CA (US);
Alice Silverberg, Columbus, OH (US);
Craig B. Gentry, Mountain View, CA (US);
Alice Silverberg, Columbus, OH (US);
NTT DoCoMo, Inc., Tokyo, JP;
Abstract
A signature {Sig, {Q}} is generated on a message M by a signer Ein a hierarchical system including the entities E, E, . . . , E, each entity E(i>0) being a child of E. Here where: each Sis a secret key of E; each sis a secret of S; Pis a public function of M; each Pis a public function of the ID's of all entities Esuch that 1≦j≦i; each Q=sPwhere Pis public. The verifier confirms that where: the product Πê(Q,P) is taken over all integers i in a proper subset of the integers from 1 to t inclusive; ê is a bilinear non-degenerate mapping; V can be ê(Q,P) where iis predefined (e.g. 1), or V can be another expression is a verifier is part of the hierarchical system.