Patents by Inventor Yoshihiro Fujii
Yoshihiro Fujii 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: 20240333480Abstract: According to one embodiment, a secret sharing storage system includes a plurality of storage devices, a random number generator, a first secret sharing apparatus and a second secret sharing apparatus. The first secret sharing apparatus generate n pieces of first distributed data by performing distribution processing on second data obtained by encrypting first data using a random number, and separately stores the n pieces of first distributed data to n storage devices. The second secret sharing apparatus generates n pieces of second distributed data by performing distribution processing on the random number, and separately store the n pieces of second distributed data to n storage devices.Type: ApplicationFiled: April 1, 2024Publication date: October 3, 2024Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA DIGITAL SOLUTIONS CORPORATIONInventors: Yuki Nanjo, Yoshikazu Hanatani, Yoshihiro Fujii, Masakatsu Matsuo, Koji Muto, Takuma Shinya
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Patent number: 11003681Abstract: According to one embodiment, there is provided an anonymization system including at least one encryption apparatus, an anonymization apparatus, and a decryption apparatus. The encryption apparatus store personal data including one or more values for each item, and generates encrypted data from the personal data by encrypting the one or more values for each item included in the personal data. The anonymization apparatus generates encrypted anonymized data from the encrypted data without decryption by anonymizing one or more values for at least a portion of the items of the encrypted data. The decryption apparatus generates anonymized data from the encrypted anonymized data by decrypting the encrypted anonymized data.Type: GrantFiled: February 28, 2017Date of Patent: May 11, 2021Assignees: Kabushiki Kaisha Toshiba, Toshiba Solutions CorporationInventors: Masanobu Koike, Yoshihiro Fujii
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Patent number: 10313119Abstract: A data management device according to an embodiment stores first encrypted data obtained by encrypting plain text data with a first public key of a first user device. The data management device stores a first re-encryption key for re-encrypting the first encrypted data without decrypting to obtain first re-encrypted data decryptable with a private key of a second user device. The data management device stores a conversion key generated from a first private key corresponding to the first public key and a second private key of the first user device. The data management device converts the first encrypted data into second encrypted data with the conversion key. The data management device The data management device converts the first re-encryption key into a second re-encryption key with the conversion key.Type: GrantFiled: September 7, 2016Date of Patent: June 4, 2019Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA SOLUTIONS CORPORATIONInventors: Masanobu Koike, Yoshihiro Fujii
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Patent number: 9962760Abstract: A titanium slab is appropriate for hot rolling, is produced by electron beam melting furnace, has superior linearity so that it can be fed into a hot rolling machine without performing breaking down process or other subsequent correcting process after production, and has good structure having no cracks at the corner parts. A process for production thereof is also provided. The titanium slab is directly produced by a mold of an electron beam melting furnace, and has the deformation of not more than 5 mm for the thickness direction versus the longitudinal direction and deformation of not more than 2.5 mm for the width direction versus the longitudinal direction, both per a length of 1000 mm of the slab. The process for production of this titanium slab for hot rolling has a step of using an electron beam melting furnace in which its rectangular mold has mold walls of a long side and mold walls of a short side, and a step of pouring molten metal from one of the mold walls of a short side.Type: GrantFiled: February 8, 2010Date of Patent: May 8, 2018Assignees: TOHO TITANIUM CO., LTD., NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Hisamune Tanaka, Norio Yamamoto, Takeshi Shiraki, Takashi Oda, Yoshimasa Miyazaki, Yoshihiro Fujii, Kazuhiro Takahashi
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Re-encryption key generator, re-encryption device, encryption device, decryption device, and program
Patent number: 9819487Abstract: A re-encryption key generator according to an embodiment generates a re-encryption key to obtain re-encrypted data that can be decrypted by a second private key of a second user device by re-encrypting ciphertext obtained by encrypting plaintext by a first public key of a first user device without decryption. The re-encryption key generator stores a first private key corresponding to the first public key. The re-encryption key generator stores a second re-encryption key generation key of the second user device that is different from a second public key corresponding to the second private key. The re-encryption key generator generates the re-encryption key based on the first private key and the second re-encryption key generation key.Type: GrantFiled: February 6, 2015Date of Patent: November 14, 2017Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA SOLUTIONS CORPORATIONInventors: Yoshihiro Fujii, Koji Okada, Tatsuyuki Matsushita, Ryotaro Hayashi -
Patent number: 9813386Abstract: Upon receiving ciphertext data transmitted by each service apparatus, a cooperation apparatus according to an embodiment generates re encrypted data by performing re encryption processing for the ciphertext data using are encryption key. Each of the service apparatuses transmits, to the cooperation apparatus, a request to acquire user information of a user specified by an identification (ID) indicated by the ciphertext data and stored in the other service apparatus, together with the ciphertext data. Upon receiving the re encrypted data transmitted by the cooperation apparatus, the service apparatus acquires an ID by decrypting the re encrypted data using a private key, reads out user information, and transmits the user information to the other service apparatus.Type: GrantFiled: March 25, 2015Date of Patent: November 7, 2017Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA SOLUTIONS CORPORATIONInventors: Yoshihiro Fujii, Koji Okada, Hiroyuki Mayuzumi, Masahisa Tajiri
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Patent number: 9719154Abstract: The present invention provides a titanium slab for hot rolling which can be fed into a general purpose hot-rolling mill for producing strip coil, without passage through a breakdown process such as blooming or a straightening process, and can further suppress surface defect occurrence of the hot-rolled strip coil, and a method of producing and a method of rolling the same, characterized in that in the cast titanium slab an angle ? formed by the crystal growth direction (solidification direction) from the surface layer toward the interior and a direction parallel to the slab casting direction (longitudinal direction) is 45 to 90°, and moreover, there is a surface layer structure of 10 mm or greater whose ? is 70 to 90°, and further characterized in that a crystal grain layer of 10 mm or greater is formed whose C-axis direction inclination of a titanium ? phase is, as viewed from the side of the slab to be hot rolled, in the range of 35 to 90° from the normal direction of the surface to be hot rolled.Type: GrantFiled: February 8, 2010Date of Patent: August 1, 2017Assignees: NIPPON STEEL & SUMITOMO METAL CORPORATION, TOHO TITANIUM CO., LTD.Inventors: Kazuhiro Takahashi, Tomonori Kunieda, Kenichi Mori, Hiroaki Otsuka, Hideki Fujii, Yoshihiro Fujii, Yoshimasa Miyazaki, Takashi Oda, Hisamune Tanaka, Osamu Tada
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Patent number: 9698984Abstract: In a decryption apparatus according to an embodiment, a holding device pre-holds a verification formula. A determination device performs a calculation based on the verification formula read from the holding device by substituting, into the verification formula, the part of the re-encrypted data received from a re-encryption apparatus and the public key of a re-encryption key generation apparatus and the private key of the decryption apparatus, to determine whether or not the verification formula holds true. An output device outputs verification success when a result of the determination indicates that the verification formula holds true.Type: GrantFiled: September 8, 2014Date of Patent: July 4, 2017Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA SOLUTIONS CORPORATIONInventors: Yoshihiro Fujii, Takuya Yoshida, Koji Okada
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Publication number: 20170177683Abstract: According to one embodiment, there is provided an anonymization system including at least one encryption apparatus, an anonymization apparatus, and a decryption apparatus. The encryption apparatus store personal data including one or more values for each item, and generates encrypted data from the personal data by encrypting the one or more values for each item included in the personal data. The anonymization apparatus generates encrypted anonymized data from the encrypted data without decryption by anonymizing one or more values for at least a portion of the items of the encrypted data. The decryption apparatus generates anonymized data from the encrypted anonymized data by decrypting the encrypted anonymized data.Type: ApplicationFiled: February 28, 2017Publication date: June 22, 2017Applicants: Kabushiki Kaisha Toshiba, Toshiba Solutions CorporationInventors: Masanobu KOIKE, Yoshihiro FUJII
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Patent number: 9635001Abstract: A re-encryption system according to this embodiment includes a file sharing apparatus and a re-encryption apparatus. Upon receiving a file request from the client apparatus, the file sharing apparatus acquires a first encrypted file based on the file request, and transmits a re-encryption request including the first encrypted file to the re-encryption apparatus. The re-encryption apparatus re-encrypts the first encrypted file included in the re-encryption request to the second encrypted file based on the re-encryption key, and transmits the second encrypted file to the file sharing apparatus. The file sharing apparatus transmits the second encrypted file to the client apparatus. The client apparatus obtains the file by decrypting the second encrypted file based on a private key corresponding to the public key of the member.Type: GrantFiled: May 9, 2014Date of Patent: April 25, 2017Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA SOLUTIONS CORPORATIONInventors: Yuki Kaseda, Takuya Yoshida, Yoshihiro Fujii, Shingo Abe, Masataka Yamada
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Publication number: 20160380768Abstract: A data management device according to an embodiment stores first encrypted data obtained by encrypting plain text data with a first public key of a first user device. The data management device stores a first re-encryption key for re-encrypting the first encrypted data without decrypting to obtain first re-encrypted data decryptable with a private key of a second user device. The data management device stores a conversion key generated from a first private key corresponding to the first public key and a second private key of the first user device. The data management device converts the first encrypted data into second encrypted data with the conversion key. The data management device The data management device converts the first re-encryption key into a second re-encryption key with the conversion key.Type: ApplicationFiled: September 7, 2016Publication date: December 29, 2016Applicants: Kabushiki Kaisha Toshiba, TOSHIBA SOLUTIONS CORPORATIONInventors: Masanobu KOIKE, Yoshihiro FUJII
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Patent number: 9426131Abstract: A server apparatus according to an embodiment generates a random number on receiving from a user apparatus a notification showing that a re-encryption key should be updated, and calculates re-encryption key data on the basis of the re-encryption key stored and the random number generated. The server apparatus transmits the re-encryption key to the user apparatus and receives, from the user apparatus, the user private key not updated yet and re-encryption key updating data calculated from the re-encryption key data on the basis of the user private key updated. The server apparatus calculates the re-encryption key updated, on the basis of the re-encryption key updating data and the random number, and replaces the re-encryption key stored in the storage device with the updated re-encryption key.Type: GrantFiled: March 19, 2014Date of Patent: August 23, 2016Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA SOLUTIONS CORPORATIONInventors: Ryotaro Hayashi, Tatsuyuki Matsushita, Yoshihiro Fujii, Takuya Yoshida, Koji Okada
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Patent number: 9386016Abstract: An authentication device receives each authentication context including an output information block, an input information block, and an authenticator block. The output information block includes a process result and process result identification information. The input information block includes a process result and process result identification information. The authentication device verifies each authenticator block. The authentication device searches for the output information block having the same value of process result identification information as the value of process result identification information in the input information block from other authentication contexts based on process result identification information in the input information block included in each authentication context.Type: GrantFiled: August 17, 2007Date of Patent: July 5, 2016Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA SOLUTIONS CORPORATIONInventors: Hidehisa Takamizawa, Asahiko Yamada, Tomoaki Morijiri, Koji Okada, Tatsuro Ikeda, Minoru Nishizawa, Yoshihiro Fujii
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Publication number: 20160119292Abstract: A re-encryption system according to this embodiment includes a file sharing apparatus and a re-encryption apparatus. Upon receiving a file request from the client apparatus, the file sharing apparatus acquires a first encrypted file based on the file request, and transmits a re-encryption request including the first encrypted file to the re-encryption apparatus. The re-encryption apparatus re-encrypts the first encrypted file included in the re-encryption request to the second encrypted file based on the re-encryption key, and transmits the second encrypted file to the file sharing apparatus. The file sharing apparatus transmits the second encrypted file to the client apparatus. The client apparatus obtains the file by decrypting the second encrypted file based on a private key corresponding to the public key of the member.Type: ApplicationFiled: May 9, 2014Publication date: April 28, 2016Applicants: Kabushiki Kaisha Toshiba, Toshiba Solutions CorporationInventors: Yuki KASEDA, Takuya YOSHIDA, Yoshihiro FUJII, Shingo ABE, Masataka YAMADA
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Patent number: 9246683Abstract: A re-encryption key generator according to an embodiment generates a re-encryption key required to re-encrypt, without decrypting, ciphertext data obtained by encrypting plaintext data by means of a first public key of a first user device to obtain re-encrypted text data which can be decrypted by a second private key of a second user device. The first storage device stores a first private key corresponding to the first public key. The second storage device stores a second public key corresponding to the second private key. The re-encryption key generation device generates the re-encryption key based on the first private key, the second public key, and the first random number.Type: GrantFiled: October 25, 2013Date of Patent: January 26, 2016Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA SOLUTIONS CORPORATIONInventors: Ryotaro Hayashi, Tatsuyuki Matsushita, Yoshihiro Fujii, Takuya Yoshida, Koji Okada
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Patent number: 9197410Abstract: According to one embodiment, a master key management device generates, by using a first secret key stored in a first storage unit and a third public key, a re-encryption key used to re-encrypt a second secret key which is stored in a second storage unit and which is encrypted with a first public key to the second secret key encrypted with the third public key. A key management server device receives the generated re-encryption key from the master key management device while the master key management device and the key management server device are connected to each other, and stores the received re-encryption key in a third storage unit. The master key management device and the key management server device are disconnected after the re-encryption key is stored in the third storage unit.Type: GrantFiled: August 16, 2013Date of Patent: November 24, 2015Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA SOLUTIONS CORPORATIONInventors: Takuya Yoshida, Yoshihiro Fujii
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Publication number: 20150200917Abstract: Upon receiving ciphertext data transmitted by each service apparatus, a cooperation apparatus according to an embodiment generates re-encrypted data by performing re-encryption processing for the ciphertext data using a re-encryption key. Each of the service apparatuses transmits, to the cooperation apparatus, a request to acquire user information of a user specified by an ID indicated by the ciphertext data and stored in the other service apparatus, together with the ciphertext data. Upon receiving the re-encrypted data transmitted by the cooperation apparatus, the service apparatus acquires an ID by decrypting the re-encrypted data using a private key, reads out user information, and transmits the user information to the other service apparatus.Type: ApplicationFiled: March 25, 2015Publication date: July 16, 2015Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA SOLUTIONS CORPORATIONInventors: Yoshihiro FUJII, Koji Okada, Hiroyuki Mayuzumi, Masahisa Tajiri
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RE-ENCRYPTION KEY GENERATOR, RE-ENCRYPTION DEVICE, ENCRYPTION DEVICE, DECRYPTION DEVICE, AND PROGRAM
Publication number: 20150180661Abstract: A re-encryption key generator according to an embodiment generates a re-encryption key to obtain re-encrypted data that can be decrypted by a second private key of a second user device by re-encrypting ciphertext obtained by encrypting plaintext by a first public key of a first user device without decryption. The re-encryption key generator stores a first private key corresponding to the first public key. The re-encryption key generator stores a second re-encryption key generation key of the second user device that is different from a second public key corresponding to the second private key. The re-encryption key generator generates the re-encryption key based on the first private key and the second re-encryption key generation key.Type: ApplicationFiled: February 6, 2015Publication date: June 25, 2015Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA SOLUTIONS CORPORATIONInventors: Yoshihiro FUJII, Koji OKADA, Tatsuyuki MATSUSHITA, Ryotaro HAYASHI -
Patent number: 8980257Abstract: It has been found out that among antibodies showing reactivity with wild type TGF-?, antibodies less reactive with G79A-substituted TGF-? have an excellent growth-suppressing effect on cancer cells having a mutated Ras gene. Further, it has been found out that most of these antibodies have an activity of inhibiting EGFR tyrosine phosphorylation and/or an induction-suppressing activity on vascular endothelial cells.Type: GrantFiled: May 17, 2011Date of Patent: March 17, 2015Assignee: Medical & Biological Laboratories Co., Ltd.Inventors: Makoto Kaneda, Yoshihiro Fujii, Yoshihiro Hayata, Yoshiro Kishi, Ichiro Yahara
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Publication number: 20150043735Abstract: In a decryption apparatus according to an embodiment, a holding device pre-holds a verification formula. A determination device performs a calculation based on the verification formula read from the holding device by substituting, into the verification formula, the part of the re-encrypted data received from a re-encryption apparatus and the public key of a re-encryption key generation apparatus and the private key of the decryption apparatus, to determine whether or not the verification formula holds true. An output device outputs verification success when a result of the determination indicates that the verification formula holds true.Type: ApplicationFiled: September 8, 2014Publication date: February 12, 2015Applicants: Kabushiki Kaisha Toshiba, Toshiba Solutions CorporationInventors: Yoshihiro FUJII, Takuya Yoshida, Koji Okada