公开(公告)号：US20060185022A1

公开(公告)日：2006-08-17

申请号：US11405983

申请日：2006-04-18

申请人： Yasuhiro Yamanaka ,  Kazunori Yoshitomi ,  Fumiaki Hisamatsu ,  Kenji Yoshino ,  Shinichi Ueno

发明人： Yasuhiro Yamanaka ,  Kazunori Yoshitomi ,  Fumiaki Hisamatsu ,  Kenji Yoshino ,  Shinichi Ueno

IPC分类号： G06F17/30

CPC分类号： H04L63/0428 ,  H04L29/06 ,  H04L63/06 ,  H04L63/08 ,  H04L63/104 ,  H04L2463/101

摘要： An authoring system which authors content data to be distributed through an information terminal by encryption for copyright protection includes an authoring device and an authoring key generator. The authoring key generator generates a content identifier (CID) uniquely allocated to each of the content data (Content), an authoring key enabling key (CEK) uniquely allocated to the authoring device, and an authoring key (CED) obtained by encrypting a content key (Kc) for encrypting the content data and a second content key (EKc) using the CID and the CEK. The second content key (Ekc) is formed by encrypting the content key (Kc) using a root key (Kroot). The authoring device has a unit which decrypts the content key (Kc) and the second content key (Ekc) using the CID and the CEK, and a unit which encrypts the content data using the decrypted content key (Kc) to generate authored encrypted content data (E (Kc, Content)). For proper external authentication, a device which supplies the content data from an information terminal to a storage medium includes a unit which holds a first external authentication key securely; a unit which generates random numbers; a unit which encrypts the random numbers using the first external authentication key to generate first encrypted data; a unit which sends the random numbers to the information terminal; a unit which receives, from the information terminal, second encrypted data obtained by encrypting the random numbers using a second external authentication key equal to the first one; and a unit which compares the first and second encrypted data.

公开(公告)号：US07328458B2

公开(公告)日：2008-02-05

申请号：US10223798

申请日：2002-08-20

申请人： Yasuhiro Yamanaka ,  Kazunori Yoshitomi ,  Fumiaki Hisamatsu ,  Kenji Yoshino ,  Shinichi Ueno

发明人： Yasuhiro Yamanaka ,  Kazunori Yoshitomi ,  Fumiaki Hisamatsu ,  Kenji Yoshino ,  Shinichi Ueno

IPC分类号： H04L9/32

CPC分类号： H04L63/0428 ,  H04L29/06 ,  H04L63/06 ,  H04L63/08 ,  H04L63/104 ,  H04L2463/101

摘要： An authoring system authors content data for distribution through an information terminal by encryption for copyright protection. The system includes an authoring device and an authoring key generator. The generator generates a content identifier uniquely allocated to each of the content data, an authoring key enabling key uniquely allocated to the authoring device, and an authoring key obtained by encrypting a content key for encrypting the content data and a second content key using the CID and the CEK. The second content key is formed by encrypting the content key using a root key. The authoring device has a unit which decrypts the content key and the second content key using the CID and the CEK, and a unit which encrypts the content data using the decrypted content key to generate authored encrypted content data.

摘要翻译： 创作系统通过信息终端通过加密来制作内容数据以进行版权保护。 该系统包括创作设备和创作密钥生成器。 生成器生成唯一分配给每个内容数据的内容标识符，创作密钥使得能够唯一地分配给创作设备的密钥，以及通过加密内容密钥获取的创作密钥和使用CID的第二内容密钥 和CEK。 第二内容密钥通过使用根密钥加密内容密钥来形成。 创作装置具有使用CID和CEK解密内容密钥和第二内容密钥的单元，以及使用解密的内容密钥对内容数据进行加密以生成编辑的加密内容数据的单元。