公开(公告)号：AT355671T

公开(公告)日：2006-03-15

申请号：AT01917787

申请日：2001-04-02

Applicant: SONY CORP

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

IPC: G06F12/14 ,  G06F1/00 ,  G06F21/10 ,  G06F21/62 ,  G11B20/00 ,  H04L9/08 ,  H04L9/00 ,  G06Q20/00 ,  G11B20/10 ,  G11B20/12

Abstract: A content key, an authentication key, and a program data etc. are transmitted with an enabling key block (EKB) in an encrypted key constitution of a tree structure. The EKB has a constitution in which a device as a leaf of the tree holds a leaf key and a limited node key, and a specific enabling key block (EKB) is generated and distributed to a group specified by a specific node to limit devices that can be renewed. As the devices that do not belong to the group cannot perform decryption, the security for distributing keys etc. can be secured. Thus, distribution of various kinds of keys or data is executed in an encryption key constitution of a tree structure to realize an information processing system and method enabling to distribute data efficiently and safely.

公开(公告)号：AU779440B2

公开(公告)日：2005-01-27

申请号：AU6632101

申请日：2001-06-21

Applicant: SONY CORP

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

IPC: G06F21/10 ,  G11B20/00 ,  G11B20/10 ,  H04L9/08 ,  H04L9/00 ,  G06F12/14 ,  G10K15/02

Abstract: An information reproducing method and an information reproducing device in which the key renewal block (KRB) of the latest verison is selectively used to encrypt the content to store the encrypted contents in a recording medium. A plural num er of KRBs of different generations and versions are stored in a recording medium. If the latest KRB is detected, it is stored in a memory unit within the recording and/or reproducing device. A plural number of KRBs having plural different generations or versions are stored on the recording medium. With the present method and device, in storing the content in the recording medium, the latest usable one of the KRB in the memory unit of the reproducing device and plural KRBs on the recording medium is detected to acquire an encrypting key, such as a media key, to execute the content encryption. In this manner, the encrypted content based on a KRB of a newer version can at all times be stored on the recording medium.

公开(公告)号：HK1052417A1

公开(公告)日：2003-09-11

申请号：HK03103128

申请日：2003-04-30

Applicant: SONY CORP

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

IPC: G06F12/14 ,  G06F1/00 ,  G06F21/10 ,  G06F21/62 ,  G11B20090101 ,  G11B20/00 ,  H04L20090101 ,  H04L9/08

Abstract: A content key, an authentication key, and a program data etc. are transmitted with an enabling key block (EKB) in an encrypted key constitution of a tree structure. The EKB has a constitution in which a device as a leaf of the tree holds a leaf key and a limited node key, and a specific enabling key block (EKB) is generated and distributed to a group specified by a specific node to limit devices that can be renewed. As the devices that do not belong to the group cannot perform decryption, the security for distributing keys etc. can be secured. Thus, distribution of various kinds of keys or data is executed in an encryption key constitution of a tree structure to realize an information processing system and method enabling to distribute data efficiently and safely.

公开(公告)号：NO332239B1

公开(公告)日：2012-08-06

申请号：NO20015908

申请日：2001-12-03

Applicant: SONY CORP

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

IPC: G06F12/14 ,  H04L9/08 ,  G06F1/00 ,  G06F21/10 ,  G06F21/62 ,  G06Q20/00 ,  G11B20/00 ,  G11B20/10 ,  G11B20/12

Abstract: A content key, an authentication key, and a program data etc. are transmitted with an enabling key block (EKB) in an encrypted key constitution of a tree structure. The EKB has a constitution in which a device as a leaf of the tree holds a leaf key and a limited node key, and a specific enabling key block (EKB) is generated and distributed to a group specified by a specific node to limit devices that can be renewed. As the devices that do not belong to the group cannot perform decryption, the security for distributing keys etc. can be secured. Thus, distribution of various kinds of keys or data is executed in an encryption key constitution of a tree structure to realize an information processing system and method enabling to distribute data efficiently and safely.

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：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：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：AU780325B2

公开(公告)日：2005-03-17

申请号：AU4470901

申请日：2001-04-02

Applicant: SONY CORP

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

IPC: G06F12/14 ,  G06F1/00 ,  G06F21/10 ,  G06F21/62 ,  G11B20/00 ,  H04L9/08 ,  H04L9/00 ,  G06F17/60 ,  G11B20/10 ,  G11B20/12

Abstract: A content key, an authentication key, and a program data etc. are transmitted with an enabling key block (EKB) in an encrypted key constitution of a tree structure. The EKB has a constitution in which a device as a leaf of the tree holds a leaf key and a limited node key, and a specific enabling key block (EKB) is generated and distributed to a group specified by a specific node to limit devices that can be renewed. As the devices that do not belong to the group cannot perform decryption, the security for distributing keys etc. can be secured. Thus, distribution of various kinds of keys or data is executed in an encryption key constitution of a tree structure to realize an information processing system and method enabling to distribute data efficiently and safely.

公开(公告)号：HK1053916A1

公开(公告)日：2003-11-07

申请号：HK03104432

申请日：2003-06-19

Applicant: SONY CORP

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

IPC: G06F21/10 ,  G10K20060101 ,  G11B20060101 ,  G11B20/00 ,  H04L20060101 ,  H04L9/08 ,  H04L29/06

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.