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:
Dec. 29, 2015
Filed:
Sep. 08, 2014
Kyocera Document Solutions Inc., Osaka, JP;
Masaki Sone, Osaka, JP;
KYOCERA Document Solutions Inc., Tamatsukuri, Chuo-ku, Osaka, JP;
Abstract
An embedded system includes a nonvolatile memory, a control section, and a firmware update section. The nonvolatile memory stores firmware and a public key in a normal area, and stores a hash value concerning the public key in an access restricted area. The control section reads and executes the firmware from the nonvolatile memory. The firmware update section receives new firmware in which the hash value is encrypted and given as an electronic signature, and updates the firmware to the new firmware. The firmware update section is configured to: read the public key from the nonvolatile memory to calculate the hash value concerning the public key; when the hash value is identical to the hash value stored in the nonvolatile memory, calculate a hash value of the new firmware; decrypt the electronic signature with the public key to restore the hash value; and when these hash values are identical to each other, update the firmware.