Patents by Inventor Hiroshi Suu
Hiroshi Suu 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: 20150312043Abstract: 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: September 11, 2014Publication date: October 29, 2015Inventors: Hiroshi Suu, Akira Miura, Akihiro Kasahara, Shinichi Matsukawa
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Publication number: 20150261941Abstract: A recording device configured to store content data in an encrypted manner, the recording device comprises a memory unit which stores various data, and a controller which controls the memory unit. The controller possesses a controller key and unique identification information, and is configured to generate a controller-unique key unique for each controller in accordance with the controller key and the identification information. The memory unit stores an MKB generated by encrypting a medium key with a device key set that is a collection of a plurality of device keys, an encrypted device key set generated by encrypting the device key set with the controller-unique key, and a device-key-set index which uniquely identifies the device key set.Type: ApplicationFiled: June 2, 2015Publication date: September 17, 2015Applicant: Kabushiki Kaisha ToshibaInventors: Shinichi MATSUKAWA, Taku Kato, Akihiro Kasahara, Hiroshi Suu, Atsushi Kondo, Jun Sato, Akira Miura, Hiroyuki Sakamoto
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Patent number: 9083512Abstract: A recording device configured to store content data in an encrypted manner, the recording device comprises a memory unit which stores various data, and a controller which controls the memory unit. The controller possesses a controller key and unique identification information, and is configured to generate a controller-unique key unique for each controller in accordance with the controller key and the identification information. The memory unit stores an MKB generated by encrypting a medium key with a device key set that is a collection of a plurality of device keys, an encrypted device key set generated by encrypting the device key set with the controller-unique key, and a device-key-set index which uniquely identifies the device key set.Type: GrantFiled: October 3, 2013Date of Patent: July 14, 2015Assignee: KABUSHIKI KAISHA TOSHIBAInventors: Shinichi Matsukawa, Taku Kato, Akihiro Kasahara, Hiroshi Suu, Atsushi Kondo, Jun Sato, Akira Miura, Hiroyuki Sakamoto
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Patent number: 8929547Abstract: 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: GrantFiled: March 19, 2012Date of Patent: January 6, 2015Assignee: Kabushiki Kaisha ToshibaInventors: Shinichi Matsukawa, Akira Miura, Hiroshi Suu, Hiroyuki Sakamoto, Akihiro Kasahara
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Patent number: 8887153Abstract: 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: GrantFiled: November 25, 2009Date of Patent: November 11, 2014Assignee: Kabushiki Kaisha ToshibaInventors: Hiroshi Suu, Akira Miura, Akihiro Kasahara, Shinichi Matsukawa
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Publication number: 20140289529Abstract: 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: May 12, 2014Publication date: September 25, 2014Inventors: Shinichi Matsukawa, Akihiro Kasahara, Hiroshi Suu, Akira Miura
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Publication number: 20140250308Abstract: 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: May 12, 2014Publication date: September 4, 2014Applicant: Kabushiki Kaisha ToshibaInventors: Shinichi Matsukawa, Akihiro Kasahara, Hiroshi Suu, Akira Miura
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Patent number: 8799682Abstract: 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 ACto 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: GrantFiled: April 16, 2009Date of Patent: August 5, 2014Assignee: Kabushiki Kaisha ToshibaInventors: Shinichi Matsukawa, Akihiro Kasahara, Hiroshi Suu, Akira Miura
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Patent number: 8750519Abstract: This data protection system encrypts and stores data in a memory card, using a double encryption key scheme for encrypting the data with a data key and further encrypting the data key with a user key. This system provides data to a particular host device from the memory card and limits provision of the data to other host devices. The host device includes DPS program that governs control of writing data to, and reading data from the memory card. The memory card includes a first non-volatile memory and a memory controller that controls the first non-volatile memory. DPSA program is implemented in the memory controller that manages ID information for identifying a user capable of decrypting the encrypted data with the user key.Type: GrantFiled: May 27, 2009Date of Patent: June 10, 2014Assignee: Kabushiki Kaisha ToshibaInventors: Hiroshi Suu, Akihiro Kasahara, Akira Miura
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Patent number: 8731202Abstract: Spread of a forged storage medium is prevented suppressing an authentic storage medium's damage and trouble of a owner to the minimum. When there is an update request of user key data, the update history of the user key data concerning the shown above-mentioned medium identifier IDm is referred to. When judged that the update of the user key data concerning the shown medium identifier IDm not being performed within a predetermined period, the update of user key data is performed. The request of a update is refused when judged that the update of the user key data concerning the shown medium identifier IDm being performed within a predetermined period.Type: GrantFiled: February 9, 2012Date of Patent: May 20, 2014Assignee: Kabushiki Kaisha ToshibaInventors: Akihiro Kasahara, Akira Miura, Hiroshi Suu
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Patent number: 8689356Abstract: A handheld device is configured to be connectable to a storage media that holds a unique media identifier and holds a content key data used to decrypt an encrypted content data. A content data delivery system is provided that is configured to be able to deliver various data to the handheld device and to make a content data available to the handheld device. The system includes a member-registration information database that holds member-registration information including a data pair of a handheld-device identifier related to the relevant handheld device and the relevant media identifier. The media identifier held by the storage media is verified with the member-registration information database.Type: GrantFiled: August 15, 2012Date of Patent: April 1, 2014Assignee: Kabushiki Kaisha ToshibaInventors: Akihiro Kasahara, Akira Miura, Hiroshi Suu
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Publication number: 20140040634Abstract: A recording device configured to store content data in an encrypted manner, the recording device comprises a memory unit which stores various data, and a controller which controls the memory unit. The controller possesses a controller key and unique identification information, and is configured to generate a controller-unique key unique for each controller in accordance with the controller key and the identification information. The memory unit stores an MKB generated by encrypting a medium key with a device key set that is a collection of a plurality of device keys, an encrypted device key set generated by encrypting the device key set with the controller-unique key, and a device-key-set index which uniquely identifies the device key set.Type: ApplicationFiled: October 3, 2013Publication date: February 6, 2014Applicant: Kabushiki Kaisha ToshibaInventors: Shinichi Matsukawa, Taku Kato, Akihiro Kasahara, Hiroshi Suu, Atsushi Kondo, Jun Sato, Akira Miura, Hiroyuki Sakamoto
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Patent number: 8578177Abstract: A recording device configured to store content data in an encrypted manner, the recording device comprises a memory unit which stores various data, and a controller which controls the memory unit. The controller possesses a controller key and unique identification information, and is configured to generate a controller-unique key unique for each controller in accordance with the controller key and the identification information. The memory unit stores an MKB generated by encrypting a medium key with a device key set that is a collection of a plurality of device keys, an encrypted device key set generated by encrypting the device key set with the controller-unique key, and a device-key-set index which uniquely identifies the device key set.Type: GrantFiled: March 4, 2010Date of Patent: November 5, 2013Assignee: Kabushiki Kaisha ToshibaInventors: Shinichi Matsukawa, Taku Kato, Akihiro Kasahara, Hiroshi Suu, Atsushi Kondo, Jun Sato, Akira Miura, Hiroyuki Sakamoto
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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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Patent number: 8402457Abstract: A content distribution method distributes a package containing a content from a content distribution apparatus to a terminal of a content distribution destination and causes the terminal to expand and display the content contained in the distributed package by using expansion software provided in the terminal. Update data of the expansion software is inserted in the package in addition to the content. When the terminal cannot expand the content by using the expansion software provided in it, the terminal updates the expansion software provided in it by using the update data contained in the distributed package and expands the content by using the updated expansion software.Type: GrantFiled: October 13, 2010Date of Patent: March 19, 2013Assignee: Kabushiki Kaisha ToshibaInventors: Akira Miura, Hiroshi Suu, Akihiro Kasahara, Kazunori Nakano
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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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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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Publication number: 20120311319Abstract: A handheld device is configured to be connectable to a storage media that holds a unique media identifier and holds a content key data used to decrypt an encrypted content data. A content data delivery system is provided that is configured to be able to deliver various data to the handheld device and to make a content data available to the handheld device. The system includes a member-registration information database that holds member-registration information including a data pair of a handheld-device identifier related to the relevant handheld device and the relevant media identifier. The media identifier held by the storage media is verified with the member-registration information database.Type: ApplicationFiled: August 15, 2012Publication date: December 6, 2012Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Akihiro KASAHARA, Akira MIURA, Hiroshi SUU
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Patent number: 8307458Abstract: A handheld device is configured to be connectable to a storage media that holds a unique media identifier and holds a content key data used to decrypt an encrypted content data. A content data delivery system is provided that is configured to be able to deliver various data to the handheld device and to make a content data available to the handheld device. The system includes a member-registration information database that holds member-registration information including a data pair of a handheld-device identifier related to the relevant handheld device and the relevant media identifier. The media identifier held by the storage media is verified with the member-registration information database.Type: GrantFiled: August 18, 2006Date of Patent: November 6, 2012Assignee: Kabushiki Kaisha ToshibaInventors: Akihiro Kasahara, Akira Miura, Hiroshi Suu
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Patent number: RE44888Abstract: A solid state image sensor includes an area sensor section having photoelectric conversion pixels arranged in the form of a matrix, a pixel selection section for selecting a pixel of the area sensor section and reading out a video signal, an analog signal processor section for performing signal processing for the video signal, an analog-digital conversion section for converting the processed signal into a digital signal, a digital signal processor section for performing signal processing to convert the digital signal into a digital signal having a predetermined signal format, and an interface section which operates in accordance with an external command, and has the function of selecting a video signal obtained by digitizing a pixel or a signal obtained by performing processing for the luminance and color difference signals of the video signal. These sections are mounted on a single chip.Type: GrantFiled: April 17, 2013Date of Patent: May 13, 2014Assignee: Kabushiki Kaisha ToshibaInventors: Masafumi Umeda, Hiroshi Suu