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    SYSTEM AND METHOD FOR PROCESSING INFORMATION USING ENCRYPTION KEY BLOCK
    1.
    发明公开
    SYSTEM AND METHOD FOR PROCESSING INFORMATION USING ENCRYPTION KEY BLOCK 审中-公开
    设备和方法处理的信息使用密钥块

    公开(公告)号：EP1204236A4

    公开(公告)日：2008-03-05

    申请号：EP01938704

    申请日：2001-06-15

    申请人： SONY CORP

    发明人： KITAYA YOSHIMICHI ,  ISHIGURO RYUJI ,  OSAWA YOSHITOMO ,  ASANO TOMOYUKI

    IPC分类号： G11B20/00 ,  H04L9/08 ,  H04L9/00

    CPC分类号： H04L9/0836 ,  G11B20/00086 ,  G11B20/0021 ,  H04L9/0891 ,  H04L2209/60

    摘要： Sub-trees separated according to the data processing capability of a device are defined in a key tree in which keys are assigned to the roots, nodes, and leaves which are devices of a tree. A management entity of each sub-tree creates a sub make-effective key block effective in the entity. A key issuing center creates a make-effective key block decodable only by an entity having common capability according to the capability information on the entity. Each entity manages the partia trees (sub-trees) of the key tree, creates a sub make-effective key block according to only the nodes of the sub-trees or the keys corresponding to the leaves, and creates a make-effective key block decodable only by the selected entity by using the sub make-effective key block. Thus, a make-effective key block can be created in accordance with the data processing capability of a device and distributed, and the key tree hierarchical structure can be dividedly managed.

    DATA TRANSMITTER, DATA TRANSMISSION METHOD, DATA RECEIVER, DATA RECEIVING METHOD, DATA TRANSFER DEVICE, AND DATA TRANSFER METHOD
    2.
    发明公开
    DATA TRANSMITTER, DATA TRANSMISSION METHOD, DATA RECEIVER, DATA RECEIVING METHOD, DATA TRANSFER DEVICE, AND DATA TRANSFER METHOD 失效
    数据站，方法进行数据传输，接收方法用于接收数据，数据传送装置和方法进行数据传输

    公开(公告)号：EP0833294A4

    公开(公告)日：2007-11-28

    申请号：EP97907342

    申请日：1997-03-17

    申请人： SONY CORP

    发明人： ASANO TOMOYUKI ,  ISHII MAKOTO ,  KUBOTA ICHIRO

    IPC分类号： H04L9/00 ,  H04L9/08 ,  G09C1/00

    CPC分类号： H04L9/0833 ,  H04L2209/34 ,  H04L2209/80

    摘要： A data transmitter which improves the safety of the transmission using an enciphering key of a decoding key and improves the safety against the leakage of the enciphered transmission data. A large capacity transmission line (152) such as a satellite transmission line through which large capacity data are transmitted and a small capacity transmission line (156) such as a public telephone line which transmits an enciphering key, a decoding key or information for generating these keys are provided. An enciphering session key (107) is generated by using a work key and the address of the receiver on the receiving side. A decoding session key (108) is generated by using the own address and the work key. The work key is, preferably, enciphered and transmitted on the small capacity transmission line (156). In a transmitter (101), not only the data (105) to be transmitted are enciphered by using the enciphering session which is thus converted as described above, but also the transmission control information such as the address data are added to the data (105) and transmitted to a receiver (102) through the large capacity transmission line (152). The enciphered data (110) are decoded by using the decoding session keys (108), which is converted as described above.