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:
Aug. 07, 2012
Filed:
Jul. 22, 2005
Yoshihiro Hori, Gifu, JP;
Yoshihiro Hori, Gifu, JP;
Sanyo Electric Co., Ltd., Osaka, JP;
Abstract
Upon a license-data transmitter verifying a certificate C[KPdx] (the license-data receiver and the license-data transmitter will be referred to as 'x' and 'y', respectively), the license-data transmitter transmits challenge information Ep(KPdx, Kcy) to the license-data receiver. In response to the challenge information, the license-data receiver transmits session information Es(Kcy, Ksx//KPpy) to the license-data transmitter. The license-data transmitter provides encrypted license data Es(Ksx, Ep(KPpx, LIC)) in a form encrypted using these two keys Ksx and KPpx thus received. With the cryptosystem according to the present invention employing EC-DH as the public key cryptosystem, the transmitter provides the second or subsequent license data without transmission of the challenge information and without updating the shared key.