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:
Mar. 26, 2019
Filed:
Jun. 09, 2016
Konica Minolta, Inc., Chiyoda-ku, Tokyo, JP;
Toshinobu Yamaguchi, Takarazuka, JP;
KONICA MINOLTA, INC., Tokyo, JP;
Abstract
A cryptographic system that can prevent encryption and decryption processes from being inefficient as an encryption key is updated is provided. The cryptographic system includes: a first encryption unit for encrypting original data in a first encryption method using a main key to generate first encrypted data; a second encryption unit for encrypting the first encrypted data in a second encryption method using a sub key to generate second encrypted data; a database for storing the second encrypted data generated; a key update unit for updating the current version of the main key to a new version of the main key and updating the current version of the sub key to a new version of the sub key; and a data update unit for converting the second encrypted data encrypted with the current version of the sub key into a state encrypted with the new version of the sub key.