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Method and device for transferring and recording content information and decipher method and device

A technology for content information and transmission devices, which is applied in the directions of secure communication devices, computer security devices, encoding/decoding devices, etc.

Inactive Publication Date: 2005-04-27
VICTOR CO OF JAPAN LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the above-mentioned existing method that only uses symmetric encryption, the knowledge related to the encryption method is the same on the side of manufacturing the encryption device and on the side of manufacturing the decryption device.

Method used

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  • Method and device for transferring and recording content information and decipher method and device
  • Method and device for transferring and recording content information and decipher method and device
  • Method and device for transferring and recording content information and decipher method and device

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Embodiment Construction

[0064] FIG. 1 shows a schematic configuration of an embodiment of a content information recording device, a content information delivery device, and a content information decryption device of the present invention. In addition, in this description, a magnetic recording medium, an optical recording medium, a semiconductor memory, etc. are referred to as a recording medium, and a transmission medium for transmitting signals such as an optical cable, an electric wire, or a wireless transmission line is referred to as a transmission line.

[0065] First, the recording side or the transmitting side will be described. On the recording side or the sending side, it includes: a key generation block 1 for generating a second key, and an encryption block for encrypting information that becomes the basis of the first key (content key) based on the second key 2 and an encryption block 3 that generates a first key (content key) from information that becomes the basis of the first key (conte...

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PUM

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Abstract

A first-key signal representative of a first key is generated from first-key base information being a base of the first key. Contents information is encrypted into encryption-resultant contents information in response to the first-key signal. A second-key signal representative of a second key is generated on the basis of initial-value information of a given initial value according to a predetermined key generation algorithm. The first-key base information is encrypted into encryption-resultant first-key base information in response to the second-key signal. The encryption-resultant contents information, the encryption-resultant first-key base information, the initial-value information, and algorithm identification information for identifying the predetermined key generation algorithm are transmitted or recorded.

Description

technical field [0001] The present invention relates to a content information transmission method, a content information recording method, a content information transmission device, a content information recording device, a content information decryption method, and contents for transmitting and recording a content key and encrypted content information encrypted using the content key. Information decryption device. Furthermore, an object of the present invention is to provide a content information transfer method and a content information transmission method that can more effectively prevent illegal playback (decryption) and copying of content information and strengthen copyright protection even if only symmetric encryption that is beneficial to processing speed is used. Information recording method, content information transmission device, content information recording device, transmission medium, recording medium, content information decryption method, and content informatio...

Claims

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Application Information

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IPC IPC(8): G09C1/00G06F21/00G06F21/10H04L9/08H04L9/12
CPCH04L9/08H04L2209/60H04L9/0866H04L9/12H04L9/0838
Inventor 黑岩俊夫菅原隆幸猪羽涉上田健二朗日暮诚司
Owner VICTOR CO OF JAPAN LTD