Key distribution system
    1.
    发明申请
    Key distribution system 审中-公开
    关键配电系统

    公开(公告)号:US20090238368A1

    公开(公告)日:2009-09-24

    申请号:US10569961

    申请日:2005-01-31

    IPC分类号: H04L9/08 H04L9/06

    摘要: The cloning source of an authorized receiving device cannot be identified. A key distribution system 1 concerning the present invention includes: a communication channel 10; a key distribution center 11; a server 12; and receiving devices 13a to 13n. The key distribution center 11 distributes, to the server 12, the information necessary for distributing shared keys SK to the receiving devices 13a to 13n, and distributes the individual information group EMMG necessary for receiving the shared keys SK from the server 12. The server 12 generates the shared keys SK, generates the common information ECM based on the shared keys SK and the system secret variable group set SPGS, and distributes the common information ECM to the receiving devices 13a to 13n. The receiving devices 13a to 13n obtain the shared keys SK based on the individual information group EMMG and the common information ECM and outputs them to outside.

    摘要翻译: 授权接收设备的克隆源无法识别。 关于本发明的密钥分发系统1包括:通信信道10; 密钥分配中心11; 服务器12; 以及接收装置13a〜13n。 密钥分配中心11向服务器12分配向接收设备13a至13n分配共享密钥SK所需的信息,并且从服务器12分发用于接收共享密钥SK所必需的个人信息组EMMG。服务器12 生成共享密钥SK,基于共享密钥SK和系统秘密变量组集SPGS生成公共信息ECM,并将公共信息ECM分配给接收装置13a〜13n。 接收设备13a至13n基于个人信息组EMMG和公共信息ECM获得共享密钥SK并将其输出到外部。

    Content distribution server, key assignment method, content output apparatus, and key issuing center
    3.
    发明申请
    Content distribution server, key assignment method, content output apparatus, and key issuing center 失效
    内容分发服务器,密钥分配方法,内容输出设备和密钥发放中心

    公开(公告)号:US20070033416A1

    公开(公告)日:2007-02-08

    申请号:US10577448

    申请日:2004-12-15

    摘要: The present invention is a content distribution system for distributing contents. The content distribution system (1) includes a key issuing center (11), a server (12), eight output apparatuses (13a) to (13h), and a communication path (10) that connects them to each other. Here, a pair of the key issuing center (11) and each of the output apparatuses (13a) to (13h) is previously given an individual key shared between them. For example, the key issuing center (11) shares an individual key IKa with the output apparatus (13a), an individual key IKb with the output apparatus (13b), and an individual key IKh with the output apparatus (13h).

    摘要翻译: 本发明是用于分发内容的内容分发系统。 内容分发系统(1)包括密钥发行中心(11),服务器(12),八个输出设备(13a)至(13h)以及将它们彼此连接的通信路径(10)。 这里,一对密钥发行中心(11)和每个输出装置(13a)至(13h)预先被给予它们之间共享的单独密钥。 例如,密钥发行中心(11)与输出设备(13a)共享一个单独的密钥IKa,与输出设备(13b)共享一个单独的密钥IKb以及与输出设备(13h)的单独密钥IKh) 。

    Methods and apparatuses for distributing system secret parameter group and encrypted intermediate key group for generating content encryption and decryption deys
    4.
    发明申请
    Methods and apparatuses for distributing system secret parameter group and encrypted intermediate key group for generating content encryption and decryption deys 审中-公开
    用于分发系统秘密参数组和加密中间密钥组的方法和装置,用于生成内容加密和解密系统

    公开(公告)号:US20060165233A1

    公开(公告)日:2006-07-27

    申请号:US10547376

    申请日:2004-12-15

    IPC分类号: H04L9/00

    摘要: A key issuing center (11) distributes a system secret parameter group that is information necessary for generating a content key used for encrypting a content to a server (12), and an encrypted intermediate key group set that is information necessary for generating a content key used for decrypting the content to output apparatuses (13a to 13n). The server (12) generates the content key based on the system secret parameter group and a time varying parameter group, encrypts the content based on the content key, and distributes the encrypted content and the time varying parameter group to the output apparatuses (13a to 13n). The output apparatuses (13a to 13n) generates a content key based on the encrypted intermediate key group set and the received time varying parameter group, decrypts the encrypted content based on the content key, and outputs to outside.

    摘要翻译: 密钥发行中心(11)将作为生成用于加密内容的内容密钥所必需的信息的系统秘密参数组分发给服务器(12),以及加密的中间密钥组集合,其是生成内容密钥所必需的信息 用于将内容解密到输出设备(13a至13n)。 服务器(12)基于系统秘密参数组和时变参数组生成内容密钥,基于内容密钥加密内容,并将加密内容和时变参数组分发给输出设备(13a) 至13 n)。 输出装置(13a〜13n)基于加密的中间密钥组和接收到的时变参数组生成内容密钥,根据内容密钥对加密的内容进行解密,并输出到外部。

    Content playback apparatus method and program and key management apparatus and system
    6.
    发明申请
    Content playback apparatus method and program and key management apparatus and system 有权
    内容播放装置的方法和程序以及密钥管理装置和系统

    公开(公告)号:US20050021985A1

    公开(公告)日:2005-01-27

    申请号:US10482846

    申请日:2003-03-18

    摘要: The present invention provides a technique which makes it possible to eliminate unauthorized playback of contents where unauthorized apparatuses are used and enable only authorized playback apparatuses to play back contents properly. The playback apparatus of the present invention obtains encrypted key information that has been encrypted by a first secret-key encrypting method, and decrypt the encrypted key information into key information using a secret key stored in a storing unit. When the key information is key-updating information, the playback apparatus updates the secret key according to the key-updating information. When the key information is a decryption key, the playback apparatus (i) obtains an encrypted content key that has been encrypted by a second secret-key encrypting method, (ii) decrypts the encrypted content key into a content key using the decryption key, (iii) obtains a scrambled content that has been scrambled by a scramble encrypting method, (iv) descramble the scrambled content using the decrypted content key, and (v) plays back the descrambled content.

    摘要翻译: 本发明提供一种技术,其可以消除使用未经授权的装置的内容的未经授权的再现,并且只允许授权的播放装置适当地播放内容。 本发明的播放装置获得已经通过第一秘密密钥加密方法加密的加密密钥信息,并且使用存储在存储单元中的秘密密钥将加密的密钥信息解密成密钥信息。 当密钥信息是密钥更新信息时,重放装置根据密钥更新信息更新密钥。 当密钥信息是解密密钥时,重放装置(i)获得已经通过第二秘密密钥加密方法加密的加密内容密钥,(ii)使用解密密钥将加密的内容密钥解密成内容密钥, (iii)通过加密加密方法获得被加扰的加密内容,(iv)使用解密的内容密钥解密加密的内容,(v)回放解扰的内容。

    Content distribution system
    8.
    发明授权
    Content distribution system 有权
    内容分发系统

    公开(公告)号:US08601590B2

    公开(公告)日:2013-12-03

    申请号:US11790609

    申请日:2007-04-26

    IPC分类号: G06F21/00 G06F21/16 G06F21/10

    摘要: A content distribution system for transferring contents between transmission device and reception device. The transmission device includes: key obtaining unit that obtains, from reception device, public keys and public key identifiers; watermark embedding unit that embeds a different public key identifier, as electronic watermark, into each of contents that are identical in substance; an encryption unit that encrypts contents using public keys to generate encrypted contents; and transmission unit that transmits encrypted contents to reception device. The reception device includes: key storage unit storing public keys, public key identifiers, and a private key that makes a pair with one of the public keys; key transmission unit that transmits public keys and public key identifiers to the transmission device; content receiving unit that receives encrypted contents from transmission device; and decryption unit that obtains a content from the received encrypted contents, using the private key.

    摘要翻译: 一种用于在传输设备和接收设备之间传送内容的内容分发系统。 传输设备包括:密钥获取单元,从接收设备获取公钥和公开密钥标识符; 水印嵌入单元将不同的公钥标识符作为电子水印嵌入到实质上相同的每个内容中; 加密单元,其使用公共密钥对内容进行加密以生成加密内容; 以及将加密内容发送到接收装置的发送单元。 接收装置包括:存储公共密钥的密钥存储单元,公开密钥标识符和与公钥之一成对的专用密钥; 密钥发送单元,向发送装置发送公开密钥和公开密钥标识符; 从发送装置接收加密内容的内容接收单元; 以及使用私钥从所接收的加密内容中获取内容的解密单元。