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:
Apr. 09, 2013
Filed:
Oct. 20, 2010
Tadashige Iwao, Kawasaki, JP;
Kentaro Masubuchi, Kawasaki, JP;
Chiaki Nakajima, Kawasaki, JP;
Kentaro Ikemoto, Kawasaki, JP;
Syunsuke Koga, Fukuoka, JP;
Yuji Takahashi, Kawasaki, JP;
Tadashige Iwao, Kawasaki, JP;
Kentaro Masubuchi, Kawasaki, JP;
Chiaki Nakajima, Kawasaki, JP;
Kentaro Ikemoto, Kawasaki, JP;
Syunsuke Koga, Fukuoka, JP;
Yuji Takahashi, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A node apparatus changes a first access key unique to itself; changes a shared key same for node apparatuses; encrypts, using the shared key, the first access key and transmits it; receives an access key notification frame; decrypts it using the shared key, thereby obtaining a second access key; attaches, to a first plaintext frame, first signature data obtained by encrypting, using the shared key, data including a first value calculated from the first plaintext frame; encrypts the first plaintext frame using the second access key and transmits thus encrypted frame; receives a second encrypted frame; decrypts it by the first access key to obtain a second plaintext frame; obtains a second value by decrypting, using the shared key, a second signature data attached to the second plaintext frame; calculates a third value from the second plaintext frame; and confirms whether the second and third values are consistent.