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:
Aug. 24, 2021
Filed:
Dec. 02, 2016
Nec Corporation, Tokyo, JP;
Toshiyuki Isshiki, Tokyo, JP;
Haruna Higo, Tokyo, JP;
NEC CORPORATION, Tokyo, JP;
Abstract
A ciphertext matching system, includes: a registration target data generation apparatus, a matching request apparatus, a data matching apparatus, and a matching support apparatus. The data matching apparatus generates a first-distance-related ciphertext in which a first distance between registered data and matching target data is kept secret by random numbers. The matching support apparatus generates a public key and a secret key and transmits the generated public key to the individual apparatuses. The data matching apparatus transmits the first-distance-related ciphertext to the matching support apparatus. The matching support apparatus determines whether the first distance obtained by decrypting the first-distance-related ciphertext with the secret key is included in a set of second distances in which the registered data and the matching target data are allowable to be matched each other and transmits a result of the determination to the data matching apparatus.