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:
Sep. 04, 2012
Filed:
Jan. 15, 2008
Norihiro Nakamura, Toyokawa, JP;
Isao Moribe, Okazaki, JP;
Hiroyoshi Masuda, Nagoya, JP;
Toru Sakai, Okazaki, JP;
Yoriyuki Nagata, Okazaki, JP;
Hironobu Sugimoto, Toyota, JP;
Tomoki Kodan, Nagoya, JP;
Norihiro Nakamura, Toyokawa, JP;
Isao Moribe, Okazaki, JP;
Hiroyoshi Masuda, Nagoya, JP;
Toru Sakai, Okazaki, JP;
Yoriyuki Nagata, Okazaki, JP;
Hironobu Sugimoto, Toyota, JP;
Tomoki Kodan, Nagoya, JP;
Aisin AW Co., Ltd., Anjo, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
A CPU of a navigation apparatus stores public keys to which priorities are set and which are published by an information distribution center in a public key storage section. The CPU of the navigation apparatus extracts an electronic signature of distribution data which is distributed from the information distribution center and verifies the electronic signature by using only 'valid' public keys among the public keys in order of the priorities. The CPU of the navigation apparatus determines that the distribution data is valid information which is distributed from the information distribution center when the electronic signature passes verification.