Patents by Inventor Shinichi Matsukawa
Shinichi Matsukawa has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20130290738Abstract: According to one embodiment, a memory chip, which is connected to a controller that controls reading and writing of data in response to a request from an external device, includes: a memory including a special area that is a predetermined data storage area; a key storage unit that stores therein a second key that corresponds to a first key used by the external device to convert the data; a converting unit that receives, from the controller, data to be written into the special area and generates converted data by converting the data to be written using the second key; and a writing unit that writes the converted data into the special area.Type: ApplicationFiled: June 24, 2013Publication date: October 31, 2013Inventors: Toru KAMBAYASHI, Akihiro Kasahara, Shinichi Matsukawa, Hiroyuki Sakamoto, Taku Kato, Hiroshi Sukegawa, Yoshihiko Hirose, Atsushi Shimbo, Koichi Fujisaki
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Patent number: 8478108Abstract: An apparatus determines whether a combination of a certificate type of a content certificate recorded on a source recording medium and a medium type of the source recording medium is a proper combination. If the combination is a proper combination, the apparatus requests a license server, which is connected to the apparatus via a network, to give approval to record content on a target recording medium. If the apparatus is a legitimate DVD recorder, the license server sends to the content recording apparatus a content certificate including on the source recording medium as the certificate type. The apparatus records the content together with the received content certificate on the target recording medium.Type: GrantFiled: March 6, 2012Date of Patent: July 2, 2013Assignee: Kabushiki Kaisha ToshibaInventors: Hiroshi Isozaki, Atsushi Ishihara, Taku Kato, Toru Kambayashi, Shinichi Matsukawa
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Patent number: 8473810Abstract: According to one embodiment, a memory chip, which is connected to a controller that controls reading and writing of data in response to a request from an external device, includes: a memory including a special area that is a predetermined data storage area; a key storage unit that stores therein a second key that corresponds to a first key used by the external device to convert the data; a converting unit that receives, from the controller, data to be written into the special area and generates converted data by converting the data to be written using the second key; and a writing unit that writes the converted data into the special area.Type: GrantFiled: September 15, 2010Date of Patent: June 25, 2013Assignee: Kabushiki Kaisha ToshibaInventors: Toru Kambayashi, Akihiro Kasahara, Shinichi Matsukawa, Hiroyuki Sakamoto, Taku Kato, Hiroshi Sukegawa, Yoshihiko Hirose, Atsushi Shimbo, Koichi Fujisaki
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Publication number: 20130132728Abstract: To reduce a load on a user terminal imposed when verifying signature data and at the same time reduce a load on a server, a signature key matrix KM includes a plurality of signature keys Ki-j arranged in a matrix structure of m rows and n columns, and is stored in a signature key matrix database 21. A correspondence relationship between a signature key set CK which is an aggregate of any signature keys selected from the n columns respectively and a user terminal 30 is stored in a correspondence relationship information database 22. A signature data generating unit 24 generates signature data having a matrix structure by encrypting a content digest D generated based on content data C by n number of signature keys included in the signature key matrix KM.Type: ApplicationFiled: November 25, 2009Publication date: May 23, 2013Inventors: Hiroshi Suu, Akira Miura, Akihiro Kasahara, Shinichi Matsukawa
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Publication number: 20130124854Abstract: According to one embodiment, a method for authenticating a device, wherein the device holds secret identification information, encrypted secret identification information, and key management information, and an authenticator holds an identification key, the method includes reading, by the authenticator, the encrypted secret identification information and the key management information from the device, and obtaining, by the authenticator, a family key by using the key management information, the family key being capable of being decrypted with the identification key. The method further includes obtaining, by the authenticator, the secret identification information by decrypting the encrypted secret identification information with the family key.Type: ApplicationFiled: June 15, 2012Publication date: May 16, 2013Inventors: Taku Kato, Tatsuyuki Matsushita, Yuji Nagai, Shinichi Matsukawa
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Publication number: 20130117633Abstract: According to one embodiment, a recording apparatus includes a memory and a controller. The memory is capable of recording data. The controller divides the memory into a first region and a second region and controls the recording of the data. The controller writes externally supplied data into the first region without performing error correction coding and address conversion of a logical address into a physical address for the externally supplied data, and performs the error correction coding and the address conversion for the data, and then writes resulting data into the second region.Type: ApplicationFiled: December 28, 2012Publication date: May 9, 2013Inventors: Shinichi MATSUKAWA, Akihiro Kasahara, Hiroyuki Sakamoto
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Publication number: 20130061048Abstract: Provided are a content delivery system, a delivery server and a user terminal whereby the load of a party who transmits content data cau be reduced. A delivery server (10) transmits, to a user terminal (20), encrypted content data Eno (Kci:Ci), encrypted content key data Enc (Kul:Kci), and encrypted control data Eno (Kui:Pi). Control data Pi includes: reproduction designation data PLI that designates a reproduction order of a plurality of pieces of content data Ci and that also designates a reproduction section of the content data Ci; and reproduction condition data URi that specifies a condition for permitting the reproduction of particular content data Ci and CMi in accordance with a predetermined reproduction procedure.Type: ApplicationFiled: March 11, 2010Publication date: March 7, 2013Inventors: Hiroshi Suu, Akira Miura, Akihiro Kasahara, Shinichi Matsukawa
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Publication number: 20120329392Abstract: In this content data delivery method, content data is transmitted from a content server to a first semiconductor device through a network. Then, the content data, content ID identifying the content data, and route data showing a route through which the content data is transmitted are transmitted from the first semiconductor device to a second semiconductor device using close-proximity wireless communication. Thereafter, the content ID and the route data are transmitted from the second semiconductor device to the content server. In addition, based on the route data, a reward corresponding to the content ID is calculated for the first semiconductor device, and the reward is provided to the first semiconductor device.Type: ApplicationFiled: March 21, 2012Publication date: December 27, 2012Applicant: Kabushiki Kaisha ToshibaInventors: Tsukasa Matoba, Shinichi Matsukawa, Akihiro Kasahara, Hiroyuki Sakamoto
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Patent number: 8332682Abstract: An interface control device includes a first interface, a second interface, a third interface, an interface controller and a clock supplying unit. The first interface is used to communicate with a first information processing device and obtain a first clock signal from the first information processing device. The second interface is used to communicate using a second clock signal with a second information processing device different from the first information processing device. The third interface is used to communicate with a controller of a data-storage medium. The interface controller performs an interface control for the first, second and third interfaces. Moreover, the clock supplying unit supplies the first clock signal to the third interface while communications through the second interface have not been established.Type: GrantFiled: February 25, 2010Date of Patent: December 11, 2012Assignee: Kabushiki Kaisha ToshibaInventors: Kiyoshi Toshimitsu, Hiroshi Suu, Shinichi Matsukawa, Akihiro Kasahara
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Patent number: 8312294Abstract: According to one embodiment, a storage medium comprises an encrypted content, key management information which is updated whenever necessary and includes a media key block including encrypted media keys obtained by encrypting a media key which is a base of an authentication key used for mutual authentication with another apparatus by using different device keys, and first and second application keys which encrypt the title keys for each application of the content and are alternately updated and encrypted when the key management information is updated.Type: GrantFiled: July 16, 2009Date of Patent: November 13, 2012Assignee: Kabushiki Kaisha ToshibaInventors: Jun Sato, Shinichi Matsukawa, Taku Kato
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Publication number: 20120272065Abstract: According to one embodiment, a host computer updates the media key block MKB in a first updatable memory device in the case where the version number of the media key block MKB read from a recording medium is newer than that of the media key block MKB in the first updatable memory device. The host computer generates a medium unique key Kmu based on a media key Km calculated from the media key block MKB read from the recording medium and a media ID read from the recording medium. The host computer executes the authentication and key exchange AKE process with the recording medium based on the medium unique key Kmu.Type: ApplicationFiled: June 27, 2012Publication date: October 25, 2012Inventors: Shinichi Matsukawa, Jun Sato, Keiko Watanabe
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Publication number: 20120243684Abstract: According to one embodiment, a content data reproduction system includes a host device which uses content data, and a storage device configured such that content data, which is obtained by decrypting encrypted content data that is created by encrypting the content data by content key data, is made usable in the host device. The host device includes a device ID which is uniquely allocated to each of host devices. The storage device includes a memory and a controller configured to control the memory.Type: ApplicationFiled: March 19, 2012Publication date: September 27, 2012Inventors: Shinichi MATSUKAWA, Akira Miura, Hiroshi Suu, Hiroyuki Sakamoto, Akihiro Kasahara
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Publication number: 20120170913Abstract: An apparatus determines whether a combination of a certificate type of a content certificate recorded on a source recording medium and a medium type of the source recording medium is a proper combination. If the combination is a proper combination, the apparatus requests a license server, which is connected to the apparatus via a network, to give approval to record content on a target recording medium. If the apparatus is a legitimate DVD recorder, the license server sends to the content recording apparatus a content certificate including on the source recording medium as the certificate type. The apparatus records the content together with the received content certificate on the target recording medium.Type: ApplicationFiled: March 6, 2012Publication date: July 5, 2012Applicants: TOSHIBA SOLUTIONS CORPORATION, KABUSHIKI KAISHA TOSHIBAInventors: Hiroshi ISOZAKI, Atsushi Ishihara, Taku Kato, Toru Kambayashi, Shinichi Matsukawa
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Patent number: 8204226Abstract: The present invention relates to an encoding and recording apparatus, a playback apparatus, and a program which solve the possibility of a capacity shortage of a protected area accompanying an increase in an information amount and the number of content keys. It is configured such that an encoded user identifier is recorded in a protected area of a key storage medium. The encoded user identifier is fixed information, and has the characteristic in which a data amount is not increased in connection with a utilization form. Therefore, a capacity shortage of the protected area is not brought about.Type: GrantFiled: April 18, 2005Date of Patent: June 19, 2012Assignees: Kabushiki Kaisha Toshiba, Toshiba Solutions CorporationInventors: Shinichi Matsukawa, Akihiro Kasahara, Hiroshi Suu, Taku Kato
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Publication number: 20120096284Abstract: To exclude any unauthorized device from a system and thereby prevent illegal use of content data, a memory card 10 stores a service key Ksrv for encrypting content key data Kc in a hidden area 14. The memory card 10 stores answer data AC to be obtained when question data Q is fed to a host function F possessed by an authorized host device 20, with encryption applied to the answer data AC by the service key Ksrv. When the question data Q is provided to the host device 20, answer data AH is obtained based on the question data Q and the host function F. A comparison unit 122 judges match or mismatch of the answer data AH and the answer data AC. When they match, the memory card 10 decrypts the content key data Kc encrypted by the service key Ksrv and sends it to the host device 20.Type: ApplicationFiled: April 16, 2009Publication date: April 19, 2012Inventors: Shinichi Matsukawa, Akihiro Kasahara, Hiroshi Suu, Akira Miura
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Patent number: 8145030Abstract: An apparatus determines whether a combination of a certificate type of a content certificate recorded on a source recording medium and a medium type of the source recording medium is a proper combination. If the combination is a proper combination, the apparatus requests a license server, which is connected to the apparatus via a network, to give approval to record content on a target recording medium. If the apparatus is a legitimate DVD recorder, the license server sends to the content recording apparatus a content certificate including on the source recording medium as the certificate type. The apparatus records the content together with the received content certificate on the target recording medium.Type: GrantFiled: March 16, 2007Date of Patent: March 27, 2012Assignees: Kabushiki Kaisha Toshiba, Toshiba Solutions CorporationInventors: Hiroshi Isozaki, Atsushi Ishihara, Taku Kato, Toru Kambayashi, Shinichi Matsukawa
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Publication number: 20110131470Abstract: According to one embodiment, a memory chip, which is connected to a controller that controls reading and writing of data in response to a request from an external device, includes: a memory including a special area that is a predetermined data storage area; a key storage unit that stores therein a second key that corresponds to a first key used by the external device to convert the data; a converting unit that receives, from the controller, data to be written into the special area and generates converted data by converting the data to be written using the second key; and a writing unit that writes the converted data into the special area.Type: ApplicationFiled: September 15, 2010Publication date: June 2, 2011Applicant: Kabushiki Kaisha ToshibaInventors: Toru KAMBAYASHI, Akihiro KASAHARA, Shinichi MATSUKAWA, Hiroyuki SAKAMOTO, Taku KATO, Hiroshi SUKEGAWA, Yoshihiko HIROSE, Atsushi SHIMBO, Koichi FUJISAKI
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Publication number: 20110091032Abstract: According to one embodiment, a content recording apparatus including, a key preparing section configured to prepare a key to encrypt an acquired stream, a file preparing section configured to add identification information to the acquired stream to prepare a file, a hash calculating section configured to calculate a hash value concerning the identification information added to the stream by the file preparing section, a key file preparing section configured to integrate the hash value calculated by the hash calculating section and the key prepared by the key preparing section to prepare a key file, and a writing section configured to write the key file prepared by the key file preparing section in the protected area of a recording medium.Type: ApplicationFiled: August 24, 2010Publication date: April 21, 2011Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Jun SATO, Taku KATO, Shinichi MATSUKAWA, Yuji NAGAI
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Patent number: 7823211Abstract: A personal computer PC transmits to a server encoded user information and encoded license information, etc. contained in a secure recording medium. The server decodes the encoded license information to obtain license information. Then, the server deletes the encoded license information contained in the secure recording medium via the personal computer PC. The server decodes the decoded user information contained in a secure recording medium to obtain user information. Then, the server encodes the license information based on the user information to write the obtained encoded license information into the secure recording medium via the personal computer PC. In this manner, license information can be moved between two secure media and convenience can be improved.Type: GrantFiled: May 27, 2005Date of Patent: October 26, 2010Assignees: Kabushiki Kaisha Toshiba, Toshiba Solutions CorporationInventors: Shinichi Matsukawa, Akihiro Kasahara, Hiroshi Suu, Taku Kato, Kazunori Nakano, Akira Miura
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Publication number: 20100268948Abstract: A recording device comprises a memory unit configured to be communicationable with an external device and to record key data for encryption of content data through an authentication process, and a controller which controls the memory unit. The memory unit comprises a normal recording unit which is accessible from the exterior through the controller without an authentication process, a protected recording unit which is accessible from the external device when authentication of a first authentication process completes, and a writing restricted/protected recording unit which is accessible from the external device when authentication of a second authentication completes and is unwritable and unaccessible from the external device when authentication of only the first authentication process completes.Type: ApplicationFiled: February 24, 2010Publication date: October 21, 2010Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Shinichi MATSUKAWA, Taku Kato, Akihiro Kasahara, Hiroshi Suu, Akira Miura, Atsushi Kondo, Hiroyuki Sakamoto