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. 04, 2007
Filed:
Oct. 19, 2000
Kunihiko Miyazaki, Yokohama, JP;
Ryoichi Sasaki, Fujisawa, JP;
Kazuo Takaragi, Ebina, JP;
Seiichi Susaki, Yokohama, JP;
Toshiyuki Moritsu, Yokohama, JP;
Mizuhiro Sakai, Omiya, JP;
Mitsuru Iwamura, Tokyo-to, JP;
Tsutomu Matsumoto, Yokohama, JP;
Kunihiko Miyazaki, Yokohama, JP;
Ryoichi Sasaki, Fujisawa, JP;
Kazuo Takaragi, Ebina, JP;
Seiichi Susaki, Yokohama, JP;
Toshiyuki Moritsu, Yokohama, JP;
Mizuhiro Sakai, Omiya, JP;
Mitsuru Iwamura, Tokyo-to, JP;
Tsutomu Matsumoto, Yokohama, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
According to the invention, techniques for authenticating that a digitally signed document is genuine. Specific embodiments according to the present invention can determine whether a digital signature was generated by a digital signature generator, or if the digital signature was generated by a third party posing as the digital signature generator. Specific embodiments can provide independent verification of digital signer identity based upon prior signed messages, time/date stamps, and the like. Techniques according to the present invention can be embodied in methods, apparatus, computer software and systems.