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    24.
    发明专利
    未知

    公开(公告)号：AT443912T

    公开(公告)日：2009-10-15

    申请号：AT01307386

    申请日：2001-08-30

    Applicant: SONY CORP

    Inventor： ASANO TOMOYUKI ,  OSAWA YOSHITOMO

    IPC: G06F12/14 ,  G11B20/00 ,  G06F21/10 ,  G09C5/00 ,  G11B20/10 ,  G11B20/12 ,  H04L9/08 ,  H04N5/781 ,  H04N5/85 ,  H04N5/907 ,  H04N5/91 ,  H04N5/913 ,  H04N5/92 ,  H04N7/08 ,  H04N7/081 ,  H04N7/167 ,  H04N9/79 ,  H04N9/804 ,  H04N21/4405 ,  H04N21/4408 ,  H04N21/4623

    Abstract: When the recording mode of an information recording/playback device is a cognizant mode which analyzes embedded copy control information, the information recording/playback device performs content encryption using a content-encryption key generated by using a cognizant key as a content-encryption-key generating key in the cognizant mode. When the recording mode of the information recording/playback device is a non-cognizant mode which does not analyze the embedded copy control information, the information recording/playback device performs content encryption using a content-encryption key generated by using a cognizant key as a content-encryption-key generating key in the non-cognizant mode. By using these techniques, the above two recording modes are clearly distinguished and separately executed. This prevents an encryption mode indicator as copy control information and embedded copy control information from being mismatched.

    25.
    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.

    26.
    发明专利
    未知

    公开(公告)号：DE60137270D1

    公开(公告)日：2009-02-12

    申请号：DE60137270

    申请日：2001-12-21

    Applicant: SONY CORP

    Inventor： ASANO TOMOYUKI ,  OSAWA YOSHITOMO ,  OISHI TATEO ,  ISHIGURO RYUJI ,  TAKI RYUTA

    IPC: G06F12/14 ,  H04L9/00 ,  G06F21/00 ,  G06F21/10 ,  G06F21/62 ,  G06Q30/06 ,  G06Q50/00 ,  G06Q50/10 ,  G10K15/02 ,  G11B20/00 ,  G11B20/10 ,  H04L9/08 ,  H04L29/06 ,  H04N7/167

    Abstract: An information processing system and method are disclosed in which information processing is performed in a highly efficient manner using an enabling key block (EKB) on the basis of a tree structure including category subtrees. A key tree is produced so as to include a plurality of subtrees that are grouped in accordance with categories and managed by category entities. An EKB is produced so as to include data produced by selecting a path in the key tree and encrypting an upper-level key in the selected path using a lower-level key in the selected path, and the resultant EKB is provided to a device. If a change occurs in state of a category tree capable of processing an EKB identified in the EKB type definition list, a notification of the change in state is sent to an entity that uses the EKB thereby making it possible for an EKB requester to perform processing in accordance with a newest EKB.

    27.
    发明专利
    未知

    公开(公告)号：DE69839330D1

    公开(公告)日：2008-05-21

    申请号：DE69839330

    申请日：1998-04-20

    Applicant: SONY CORP

    Inventor： ISHIGURO RYUJI ,  OSAWA YOSHITOMO ,  OSAKABE YOSHIO ,  SATO MAKOTO ,  SHIMA HISATO ,  ASANO TOMOYUKI

    IPC: G06F12/14 ,  G06F21/00 ,  G06F1/00 ,  G06F3/06 ,  G06F21/24 ,  G11B19/04 ,  G11B19/12 ,  G11B20/00 ,  H04L9/08 ,  H04L9/10 ,  H04L9/32 ,  H04L12/40 ,  H04L12/64

    Abstract: A hash function and a service key are stored in advance in an EEPROM of a DVD player serving as a source. In an EEPROM of a personal computer (PC) serving as a sink, on the other hand, its ID and a license key are stored beforehand. The DVD player requests the PC to transmit the ID. The DVD player then applies the hash function to data resulting from concatenation of the ID with the service key to generate a license key (= hash (ID || service key)). Subsequently, the DVD player generates a source side session key and encrypts the session key by using the generated license key. Then, the DVD player transmits the encrypted source side session key to the PC. The PC decrypts the encrypted source side session key by using the license key stored in its EEPROM to produce a sink side session key which has a value equal to that of the source side session key.

    28.
    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.

    30.
    发明专利
    未知

    公开(公告)号：DE69836450T2

    公开(公告)日：2007-09-13

    申请号：DE69836450

    申请日：1998-04-20

    Applicant: SONY CORP

    Inventor： ISHIGURO RYUJI ,  OSAWA YOSHITOMO ,  OSAKABE YOSHIO ,  SATO MAKOTO ,  SHIMA HISATO ,  ASANO TOMOYUKI

    IPC: G06F1/00 ,  H04L9/08 ,  G06F3/06 ,  G06F13/00 ,  G06F21/00 ,  G09C1/00 ,  G11B20/00

    Abstract: An enciphering/deciphering apparatus and method are provided by which illegal copying can be prevented with a greater degree of certainty. Data enciphered by a 1394 interface (26) of a DVD player (1) is transmitted to a personal computer (2) and a magneto-optical disk apparatus (3) through a 1394 bus (11). In the magneto-optical disk apparatus (3) with which a change to a function is not open to a user, the received data is deciphered by a 1394 interface (36). In contrast, in the personal computer (2) with which a change to a function is open to a user, the enciphered data is deciphered using a time variable key (50) by a 1394 interface (49), and a result of the decipherment is further deciphered using a session key by an application section.

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