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. 01, 2010
Filed:
Sep. 13, 2005
Tomoya Satou, Nara, JP;
Makoto Fujiwara, Kyoto, JP;
Kentarou Shiomi, Kyoto, JP;
Yusuke Nemoto, Hyogo, JP;
Yuishi Torisaki, Hyogo, JP;
Kazuya Shimizu, Osaka, JP;
Shinji Inoue, Osaka, JP;
Kazuya Fujimura, Nara, JP;
Makoto Ochi, Osaka, JP;
Tomoya Satou, Nara, JP;
Makoto Fujiwara, Kyoto, JP;
Kentarou Shiomi, Kyoto, JP;
Yusuke Nemoto, Hyogo, JP;
Yuishi Torisaki, Hyogo, JP;
Kazuya Shimizu, Osaka, JP;
Shinji Inoue, Osaka, JP;
Kazuya Fujimura, Nara, JP;
Makoto Ochi, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
In a target apparatus which stores at least one piece of domain key information in a first area and a plurality of pieces of content key information each associated with any one of the domain key information in a second area, a method for generating data for detecting tampering of the content key information. The method comprises the steps of encrypting the content key information associated with one of the domain key information using a chain encryption technique, extracting data at predetermined positions in the encrypted content key information, concatenating the pieces of data extracted at the predetermined positions in the encrypted content key information to obtain concatenated data, performing a hash calculation with respect to the concatenated data to obtain a hash value, storing check values corresponding to the data at the predetermined positions in plain text, in the target apparatus, and storing the hash value in the target apparatus.