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:
Mar. 23, 2010
Filed:
May. 17, 2005
Hiroshi Isozaki, Kanagawa-ken, JP;
Takashi Kokubo, Tokyo, JP;
Koji Kanazawa, Tokyo, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
An information processing apparatus has an authentication/key exchange unit, a round trip time measuring unit, a common key transmitter, a contents key transmitter and a contents transmitter. The round trip time measuring unit sends a round trip time measuring request generated to the communication apparatus through the first communication connection to measure the round trip time, and check whether the measured round trip time is within a predetermined time and whether a transmitting source of the round trip request response is the communication apparatus sharing the first key. The common key transmitter encrypts a second key used for contents transmission by using the first key and transmits the encrypted second key through the first communication connection when the round trip time measuring unit succeeds in the checking. The contents transmitter encrypts the contents requested by the communication apparatus by using the second key and sends the encrypted contents to the communication apparatus through the second communication connection.