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:
Nov. 28, 2023
Filed:
Sep. 15, 2020
Mitsubishi Electric Corporation, Tokyo, JP;
Mitsubishi Electric Corporation, Tokyo, JP;
Abstract
A registration device () generates an encryption keyword by encrypting a keyword with a registration key, generates an index including the encryption keyword and identification information which identifies a corresponding ciphertext, generates a conversion key from the registration key and a search key, and registers a plurality of ciphertexts, the index, and the conversion key in a server device (). A search device () generates a search query by encrypting a keyword, and transmits the search query to the server device (). The server device () generates a re-encryption keyword by re-encrypting the search query with the registered conversion key, searches the registered index with the re-encryption keyword, acquires, from the index, the identification information if the encryption keyword is obtained as a search result, extracts a ciphertext identified by the identification information from the registered plurality of ciphertexts, and transmits the extracted ciphertext to the search device ().