| 摘要 |
A system that allows secure processing in a case where a download-requesting terminal and a download-destination terminal are different devices is implemented. A content distribution server receives a ticket carrying a signature of a download destination from a terminal requesting downloading of content, and verifies the ticket to verify that a device serving as the download destination is a device authorized by the download-requesting terminal, thereby verifying the authenticity of the device serving as the download destination without directly authenticating the device serving as the download destination. Furthermore, a content-signing key [Ksig] or a hash value is exchanged as data that can be cryptographically processed only at the download-requesting device and the download-destination device, so that, for example, checking of the integrity of the content is allowed only at a legitimate download-destination device.
|
