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:
May. 31, 2022
Filed:
Jun. 09, 2017
Mitsubishi Electric Corporation, Tokyo, JP;
Yoshihiro Koseki, Tokyo, JP;
Yutaka Kawai, Tokyo, JP;
Mitsubishi Electric Corporation, Tokyo, JP;
Abstract
A key generation device generates a decryption key dkhaving a tag-added decryption key and a decryption key adk. The tag-added decryption key includes a decryption key tdkin which a key attribute x is set and a tag tgrequired to decrypt a ciphertext with the decryption key tdk. In the decryption key adk, the key attribute x is set. An encryption device generates an original ciphertext octin which a ciphertext attribute y corresponding to the key attribute x is set and which can be decrypted with the tag-added decryption key. A re-encryption key generation device encrypts the decryption key tdkby an attribute-based encryption scheme using a ciphertext attribute y', so as to generate a re-encryption key rkwhich is a key for generating a re-encrypted ciphertext rctwhich can be decrypted with a decryption key adkin which a key attribute x′ corresponding to the ciphertext attribute y′ is set.