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:
Apr. 30, 2013
Filed:
Dec. 15, 2009
Nir Nice, Kfar Veradim, IL;
Yacov Yacobi, Mercer Island, WA (US);
Nir Nice, Kfar Veradim, IL;
Yacov Yacobi, Mercer Island, WA (US);
Microsoft Corporation, Redmond, WA (US);
Abstract
Described is a technology comprising a system in which two distrusting parties can submit sets of encrypted keywords using two independent secret keys to a third party who can decide, using only public keys, if the underlying cleartext message of a cryptogram produced by one distrusting party matches that of a cryptogram produced by the other. The third party (e.g., a server) uses generator information corresponding to a generator of an elliptic curve group to determine whether the sets of encrypted keywords match each other. Various ways to provide the generator information based upon the generator are described. Also described is the use of one-ray randomization and two-way randomization as part of the system to protect against dictionary attacks.