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:
Oct. 05, 2021
Filed:
Jan. 18, 2017
Mitsubishi Electric Corporation, Tokyo, JP;
Ryo Hiromasa, Tokyo, JP;
Yutaka Kawai, Tokyo, JP;
MITSUBISHI ELECTRIC CORPORATION, Tokyo, JP;
Abstract
An encryption device generates a ciphertext ct including an encryption element C in which a plaintext μ is set, an encryption element Cin which an attribute x is set, and an encryption element F that is not to be decrypted with a decryption key skcorresponding to a policy f satisfied by the attribute x and in which the plaintext μ is set. A homomorphic computation device converts the ciphertext ct into a ciphertext ctby converting, with the encryption element F, the encryption element C included in the ciphertext ct into an encryption element Cthat can be decrypted with the decryption key skcorresponding to a policy set F acquired by a policy acquisition unit. The homomorphic computation device performs homomorphic computation g on the ciphertext ctto generate a ciphertext ct*.