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:
Jun. 18, 2013
Filed:
Aug. 29, 2011
Mayuko Tanaka, Yokohama, JP;
Hiroo Okamoto, Yokohama, JP;
Yoshimichi Kudo, Fujisawa, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A content transmission apparatus including: an authenticator configured (i) to perform authentication, (ii) to share an authentication key, (iii) to request transmission range acknowledgement and authentication information, (iv) to receive a response, and (v) to share an exchange key; an encryptor to encrypt based on the exchange key; and a timer measuring a time interval between transmission of said request for transmission range acknowledgement and reception of a response; wherein, said authenticator measures said time interval using said timer, and if a time measurement value exceeds a predetermined value, said authenticator does not share said exchange key; and wherein, said response of said request for transmission range acknowledgement includes a data generated based on said authentication information and said authentication key, and if said data is incorrect, said authenticator does not share said exchange key.