Mitsubishi Electric Assigned Patent

Mitsubishi Electric Corp., Tokyo, Japan, has been assigned a patent (10,592,682) developed by Mori, Takumi, Kawai, Yutaka, and Matsuda, Nori, Tokyo, Japan , for “data storage apparatus, data processing method, and computer readable medium adding a user attribute of a revoked user to an embedded decryption condition while encrypted data remains in an encrypted state.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”An encrypted data receiving unit (201) receives encrypted data which has been encrypted, in which a decryption condition to define a user attribute of a decryption-permission user who is permitted to decrypt the encrypted data is embedded. A data storage unit (202) stores the encrypted data received by the encrypted data receiving unit (201) in an encrypted state. A revocation processing unit (209) adds revocation information in which a user attribute of a revoked user who is no longer the decryption-permission user is indicated, to an embedded decryption condition that is embedded in the encrypted data, while the encrypted data remains in an encrypted state.”

The patent application was filed on February 20, 2015 (15/548,064).