公开(公告)号：CA2379476C

公开(公告)日：2009-11-10

申请号：CA2379476

申请日：2001-06-15

Applicant: SONY CORP

Inventor： OSAWA YOSHITOMO ,  ASANO TOMOYUKI ,  ISHIGURO RYUJI ,  KITAYA YOSHIMICHI

IPC: H04L9/08 ,  G11B20/00

Abstract: An information processing system and method using an encryption key block se ts sub- trees classified based on data processing ability of the devices (capability ) in a key tree in which respective keys are corresponded to a root, nodes and leaves of a tree in which a plurality of devices are constituted as the leaves, generates a sub-enabli ng key block which is effective for an entity in a managing subject of each sub-tree (entity), and generates an enabling key block decodable only by the entities having common capability. Also, an information processing system and method using an encryption key block manages a partial tree of a key tree (sub-tree), generates a sub- enabling key block based only on a key set corresponding to nodes or leaves included in the sub - tree, and generates an enabling key block decodable only by selected entities by using the sub- enabling key block. Thus, it is possible to generate and distribute an enabling key block corresponding to data processing ability of a device and to manage devices b y dividing a hierarchical key tree structure.

公开(公告)号：AT444616T

公开(公告)日：2009-10-15

申请号：AT01272280

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 ,  G10K15/02 ,  G11B20/00 ,  G11B20/10 ,  H04L9/08 ,  H04L29/06 ,  H04N7/167

Abstract: An information processing system and method for realizing efficient processing using an enabling key block (EKB) using a categorized tree structure. An EKB composed of encrypting data for encrypting an upper-order key by using a lower-order key on a selection path of a key tree having sub-trees managed by a category entity is created and provided to a device. When a request to create an EKB is made, a structure for creating a route key by itself or a structure for requesting a key distribution center to create a route key is selectively executed. Further a structure for requesting a category entity to create a sub-EKB when the EKB distribution center creates an EKB is provided, and therefore the EKB creation and management are made efficient.

公开(公告)号：DE60139104D1

公开(公告)日：2009-08-13

申请号：DE60139104

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.

公开(公告)号：DE60137085D1

公开(公告)日：2009-01-29

申请号：DE60137085

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.

公开(公告)号：AT419691T

公开(公告)日：2009-01-15

申请号：AT06076195

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.

公开(公告)号：DE60037088T2

公开(公告)日：2008-09-04

申请号：DE60037088

申请日：2000-04-17

Applicant: SONY CORP

Inventor： ASANO TOMOYUKI ,  OSAWA YOSHITOMO ,  KOMURO TERUYOSHI ,  HAMADA ICHIRO

IPC: G11B20/10 ,  G06F1/00 ,  G06F12/14 ,  G06F21/10 ,  G11B20/00 ,  H04L12/40 ,  H04L12/64

Abstract: Based on the detailed reproduction control information defining the reproduction control state of data to be transmitted, the CPU 12 of the data transmission apparatus creates a simplified reproduction control information roughly defining the reproduction control state of the data, stores the simplified reproduction control information of the data in the packet header of a data packet carrying the data, stores the detailed reproduction control information in the data, and transmits the simplified reproduction control information and the detailed reproduction control information as well as the data to the data receiving apparatus 20 through the transmission channel 30 from the input-output interface 16. The CPU 22 of the data receiving apparatus 20 analyses the reproduction control state of the data contained in the data packet based on the simplified reproduction infonnation and the detailed reproduction information contained in the data packet, and controls the reproduction of the data by the action of the media access part 26 according to the analysis result.

公开(公告)号：MY135432A

公开(公告)日：2008-04-30

申请号：MYPI20011673

申请日：2001-04-06

Applicant: SONY CORP

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

IPC: H04L9/08 ,  G06F1/00 ,  G06F21/00 ,  G11B20/00

Abstract: TO REALIZE AN INFORMATION PROCESSING SYSTEM AND METHOD CAPABLE REDUCING DATA QUANTITY OF AN ENABLING KEY BLOCK (EKB) USED IN AN ENCIPHER CONSTITUTION OF A TREE CONSTRUCTION. THE ENABLING KEY BLOCK (EKB) USED IN ENCIPHER KEY CONSITUTION OF A TREE CONSTRUCTION IS PRODUCED BY RECONSTRUCTIN SIMPLIFIED 2-BRANCH OR MULTI-BRANCH TYPE TREE WITH A DECODABLE TERMINAL NODE OR AS THE LOWEST STAGE, AND ON THE BASIS OF ONLY THE KEY CORRESPONDING TO A NODE LEAF OF THE RECONSTRUCTED HIERARCHICAL TREE. FURTHER, A TAG AS DISCRIMINATION DATA TREE POSITION OF AN ENCIPHER KEY STORED IN EKB IS STORED. THE TAG (607) NOT DISCRIMINATES A POSITION BUT STORES DATA FOR JUDGING PRESENCE OF ENCIPHER KEY I WITHIN EKB. A CONSIDERABLE REDUCTION IN DATA QUANTITY IS REALIZED, AND DECO PROCESS IN A DEVICE IS ALSO SIMPLIFIED.(FIG 9A,9B,9C)

公开(公告)号：DE60037088D1

公开(公告)日：2007-12-27

申请号：DE60037088

申请日：2000-04-17

Applicant: SONY CORP

Inventor： ASANO TOMOYUKI ,  OSAWA YOSHITOMO ,  KOMURO TERUYOSHI ,  HAMADA ICHIRO

IPC: G11B20/10 ,  G06F1/00 ,  G06F12/14 ,  G06F21/10 ,  G11B20/00 ,  H04L12/40 ,  H04L12/64

Abstract: Based on the detailed reproduction control information defining the reproduction control state of data to be transmitted, the CPU 12 of the data transmission apparatus creates a simplified reproduction control information roughly defining the reproduction control state of the data, stores the simplified reproduction control information of the data in the packet header of a data packet carrying the data, stores the detailed reproduction control information in the data, and transmits the simplified reproduction control information and the detailed reproduction control information as well as the data to the data receiving apparatus 20 through the transmission channel 30 from the input-output interface 16. The CPU 22 of the data receiving apparatus 20 analyses the reproduction control state of the data contained in the data packet based on the simplified reproduction infonnation and the detailed reproduction information contained in the data packet, and controls the reproduction of the data by the action of the media access part 26 according to the analysis result.

公开(公告)号：DE60126540T2

公开(公告)日：2007-11-22

申请号：DE60126540

申请日：2001-04-04

Applicant: SONY CORP

Inventor： ISHIGURO RYUJI ,  OSAWA YOSHITOMO ,  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.

公开(公告)号：AT373357T

公开(公告)日：2007-09-15

申请号：AT01272279

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 ,  G06F12/00 ,  G06F21/62 ,  G10K15/02 ,  G11B20/00 ,  G11B20/10 ,  H04L9/08 ,  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 formed so as to include a plurality of subtrees serving as category trees categorized in accordance with categories and managed by category entities. An EKB including data produced by selecting a path in a tree and encrypting a higher-level key in the selected path using a lower-level key in the selected path. The resultant EKB is provided to a device. Distribution of EKB's is managed on the basis of an EKB type definition list representing the correspondence between an EKB type identifier and one or more identification data identifying one or more category trees that can process an EKB of an EKB type specified by the EKB type identifier.