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    5.
    发明专利
    未知

    公开(公告)号：DK1185021T3

    公开(公告)日：2007-06-11

    申请号：DK01919777

    申请日：2001-04-04

    Applicant: SONY CORP

    Inventor： OSAWA YOSHITOMO ,  ISHIGURO RYUJI ,  OISHI TATEO ,  ASANO TOMOYUKI ,  MITSUZAWA ATSUSHI

    IPC: H04L9/08 ,  G06F1/00 ,  G06F21/00 ,  G11B20/00 ,  H04L9/32 ,  H04N7/16

    Abstract: The enabling key block (EKB) used in an encrypted key distributing constitution of a tree structure is generated by reconstructing a simplified 2-branch or multi-branch type tree with a terminal node or leaf which can decrypt as the lowest stage, and on the basis of only the key corresponding to a node or a leaf of the reconstructed hierarchical tree. Further, a tag as discrimination data at a tree position of an encrypted key stored in EKB is stored. The tag not only discriminates a position but stores data for judging presence of encrypted key data.within EKB. A considerable reduction in data quantity is realized, and decrypting process, in a device is also simplified. Thus, an information processing system and method capable of reducing data quantity of an enabling key block (EKB) used in an encrypted key constitution of a tree structure is realized.

    INFORMATION PROCESSING SYSTEM AND METHOD
    8.
    发明专利
    INFORMATION PROCESSING SYSTEM AND METHOD 未知

    公开(公告)号：CA2372510A1

    公开(公告)日：2001-10-18

    申请号：CA2372510

    申请日：2001-04-04

    Applicant: SONY CORP

    Inventor： ASANO TOMOYUKI ,  MITSUZAWA ATSUSHI ,  OISHI TATEO ,  OSAWA YOSHITOMO ,  ISHIGURO RYUJI

    IPC: H04L9/08 ,  G06F1/00 ,  G06F21/00 ,  G11B20/00 ,  H04L9/00 ,  G11B20/10 ,  G11B20/12 ,  G06F17/60

    Abstract: An effective key block (EKB) used for key distribution structure of tree structure is re-structured to a simplified two-branch or multi-branch tree i n which a decodable end node or leaf is at the lowest layer so as to create a re- structured layered tree according to only a key corresponding to the node or leaf of the re-structured layered tree. A tag as identification data about t he tree position of an encryption key stored in the EKB is stored. In the tag, not only the position identification but data for judging if encryption key data is present in the EKB is stored. The amount of data in the EKB is great ly reduced and the decoding by a device is simplified. Thus, providing an information processing system and method enabling reduction of the amount of data in an Effective key block (EKB) used for an encryption key structure of tree structure.

    9.
    发明专利
    未知

    公开(公告)号：AT435537T

    公开(公告)日：2009-07-15

    申请号：AT01919796

    申请日：2001-04-05

    Applicant: SONY CORP

    Inventor： ASANO TOMOYUKI ,  OSAWA YOSHITOMO ,  ISHIGURO RYUJI ,  MITSUZAWA ATSUSHI ,  OISHI TATEO

    IPC: G06F12/14 ,  H04L9/00 ,  G06F21/24 ,  G11B20/00 ,  G11B20/10 ,  G11B20/12 ,  H04L9/08 ,  H04N5/91

    Abstract: In a tree-structural key distribution system, renewed data of a master key and medium key are sent along with a key renewal block (KRB). KRB is such that each of devices included as leaves of a tree structure has a leaf key and restricted node key. A specific KRB can be generated for a group identified by a specific node and distributed to the group to restrict a device for which the key can be renewed. Any device not belonging to the group cannot decrypt the key, whereby the security of key distribution can be assured. Especially in a system using a generation-managed master key, a master key renewed with KRB can be distributed.

    10.
    发明专利
    未知

    公开(公告)号：DE60133359D1

    公开(公告)日：2008-05-08

    申请号：DE60133359

    申请日：2001-06-21

    Applicant: SONY CORP

    Inventor： ASANO TOMOYUKI ,  OSAWA YOSHITOMO ,  ISHIGURO RYUJI ,  MITSUZAWA ATSUSHI ,  OISHI TATEO

    IPC: H04L9/00 ,  G06F12/14 ,  G06F21/10 ,  G10K15/02 ,  G11B20/00 ,  G11B20/10 ,  H04L9/08 ,  H04L29/06 ,  H04N7/167

    Abstract: An information recording/reproducing device for executing a key distribution by a KRB distribution involving a tree-structure key distribution configuration. The device transmits, by using a key-structure key distribution configuration, a key such as a master key, a media key or a content key along with a key update block (KRB). The recording/reproducing device, after calculating and acquiring the key of a certain recording medium based on a reception KRB, encrypts the acquired key using an encryption key specific to the device, for example, a leaf key, and stores it in a recording medium or memory of the device. Therefore, the recording/reproducing device can calculate a key by merely decoding the encrypting key one time when next using the recording medium or contents, and can reduce computational complexity such as KRB decoding required when the device accesses a recording medium or uses contents, thereby making efficient processing on the KRB receiving side.

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