Patents by Inventor Daisuke Moriyama
Daisuke Moriyama 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: 20240129823Abstract: A wireless communication system comprising a plurality of base station devices including a first base station device and a second base station device, wherein the first base station device connected with a terminal determines whether to continue connection with the terminal or not on a basis of a communication quality requirement of the terminal and a resource that can be provided to the terminal, and the first base station device transmits a control signal instructing connection with the second base station device to the terminal in a case where the first base station device determines not to continue the connection with the terminal.Type: ApplicationFiled: February 26, 2021Publication date: April 18, 2024Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Takeru FUKUSHIMA, Motoharu SASAKI, Toshiro NAKAHIRA, Daisuke MURAYAMA, Takatsune MORIYAMA
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Publication number: 20230155592Abstract: A semiconductor device includes: an arithmetic circuit that repeats an operation related to a cryptographic processing for the predetermined number of rounds; a holding circuit that holds data related to the number of rounds of an operation of the arithmetic circuit; a judgement circuit that determines whether the number of rounds is the predetermined number of rounds; and an output buffer circuit that outputs the arithmetic result data of the arithmetic circuit when the judgement circuit determines that the number of rounds is the predetermined number. It is configured to duplicate the holding circuit, and not to output the arithmetic result data when two outputs of the duplicated holding circuit are not matched.Type: ApplicationFiled: November 14, 2022Publication date: May 18, 2023Inventor: Daisuke MORIYAMA
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Patent number: 11516024Abstract: A semiconductor device includes a memory, a random number generation circuit, and a control circuit. The memory stores key information, and the random number generation circuit generates first and second random number signals. The control circuit generates sixth and seventh random number signals from the first random number signal and the key information, generates encrypted update data from update data using the seventh random number signal, transmits the first and second random number signals as request signals to an external terminal device, receives, from the external device, first and second response signals as response signals in response to the request signals, generates an eighth random number signal using the first response signal, the second and the sixth random number signals as input signals, and provides the encrypted update data for the external terminal device when the second response signal coincides with the eighth random number signal.Type: GrantFiled: January 19, 2018Date of Patent: November 29, 2022Assignees: RENESAS ELECTRONICS CORPORATION, MITSUBISHI ELECTRIC CORPORATIONInventors: Daisuke Moriyama, Daisuke Suzuki
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Patent number: 11290257Abstract: To securely realize updating of a key shared between an apparatus on a transmission side and an apparatus on a reception side. A second apparatus encrypts a new shared key by an encryption processing unit, issues a signature for the encrypted new shared key from a signature processing unit, and transmits the signature and the encrypted new shared key to a first apparatus. When a signature processing unit fails in verifying the signature, the first apparatus performs control to prohibit at least one of processing executed after reception of the encrypted new shared key and required to store the new shared key into a storage unit.Type: GrantFiled: April 10, 2019Date of Patent: March 29, 2022Assignee: RENESAS ELECTRONICS CORPORATIONInventors: Tadaaki Tanimoto, Daisuke Moriyama
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Patent number: 11012230Abstract: A cryptographic communication method using a dynamically-generated private key is provided. A signal generation unit outputs a second signal obtained by giving an error in a predetermined range to a signal obtained based on a first signal. An error correction generation unit outputs a third signal obtained based on the second signal and auxiliary information for correcting an error included in the second signal. A private-key generation unit generates a first private key based on the third signal. An encryption calculation unit outputs an encrypted signal obtained by encrypting a fourth signal based on the first private key.Type: GrantFiled: November 16, 2017Date of Patent: May 18, 2021Assignee: RENESAS ELECTRONICS CORPORATIONInventor: Daisuke Moriyama
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Patent number: 10949527Abstract: Provided is a semiconductor device which can perform secure data transmission/reception considering functional safety. The semiconductor device includes a hardware security module circuit which performs an authentication process and an error detection circuit used to perform an error detection process at least on first data which is processed in the hardware security module circuit. A memory area associated with the error detection circuit is configured to be accessible only by the hardware security module circuit when the error detection process is performed at least on the first data.Type: GrantFiled: September 20, 2018Date of Patent: March 16, 2021Assignee: RENESAS ELECTRONICS CORPORATIONInventors: Tadaaki Tanimoto, Daisuke Moriyama, Yoshitaka Taki
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Patent number: 10931447Abstract: A data receiving device includes: a receiving unit that receives data, a list of individual identifiers, and a MAC generated by the repeater device; a pseudo-random function processing unit that derives a secret key by performing arithmetic by a predetermined pseudo-random function; a MAC generating function processing unit that generates MAC by performing arithmetic by a predetermined MAC generating function; a pseudo-random function processing controller that performs control to generate recursively a secret key corresponding to the individual identifier of each communication device from the first hierarchy to the N-th hierarchy; a MAC generating function processing controller that performs control to generate recursively a MAC corresponding to each communication device from the N-th hierarchy to the first hierarchy; and a comparator that compares the received MAC with the generated MAC corresponding to the communication device of the first hierarchy.Type: GrantFiled: July 11, 2018Date of Patent: February 23, 2021Assignee: RENESAS ELECTRONICS CORPORATIONInventor: Daisuke Moriyama
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Publication number: 20200351108Abstract: A semiconductor device includes a memory, a random number generation circuit, and a control circuit. The memory stores key information, and the random number generation circuit generates first and second random number signals. The control circuit generates sixth and seventh random number signals from the first random number signal and the key information, generates encrypted update data from update data using the seventh random number signal, transmitts the first and second random number signals as request signals to an external terminal device, receives, from the external device, first and second response signals as response signals in response to the request signals, generates an eighth random number signal using the first response signal, the second and the sixth random number signals as input signals, and provides the encrypted update data for the external terminal device when the second response signal coincides with the eighth random number signal.Type: ApplicationFiled: January 19, 2018Publication date: November 5, 2020Inventors: Daisuke MORIYAMA, Daisuke SUZUKI
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Publication number: 20190342081Abstract: To securely realize updating of a key shared between an apparatus on a transmission side and an apparatus on a reception side. A second apparatus encrypts a new shared key by an encryption processing unit, issues a signature for the encrypted new shared key from a signature processing unit, and transmits the signature and the encrypted new shared key to a first apparatus. When a signature processing unit fails in verifying the signature, the first apparatus performs control to prohibit at least one of processing executed after reception of the encrypted new shared key and required to store the new shared key into a storage unit.Type: ApplicationFiled: April 10, 2019Publication date: November 7, 2019Inventors: Tadaaki TANIMOTO, Daisuke MORIYAMA
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Publication number: 20190156018Abstract: Provided is a semiconductor device which can perform secure data transmission/reception considering functional safety. The semiconductor device includes a hardware security module circuit which performs an authentication process and an error detection circuit used to perform an error detection process at least on first data which is processed in the hardware security module circuit. A memory area associated with the error detection circuit is configured to be accessible only by the hardware security module circuit when the error detection process is performed at least on the first data.Type: ApplicationFiled: September 20, 2018Publication date: May 23, 2019Inventors: Tadaaki TANIMOTO, Daisuke MORIYAMA, Yoshitaka TAKI
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Publication number: 20190068368Abstract: A data receiving device includes: a receiving unit that receives data, a list of individual identifiers, and a MAC generated by the repeater device; a pseudo-random function processing unit that derives a secret key by performing arithmetic by a predetermined pseudo-random function; a MAC generating function processing unit that generates MAC by performing arithmetic by a predetermined MAC generating function; a pseudo-random function processing controller that performs control to generate recursively a secret key corresponding to the individual identifier of each communication device from the first hierarchy to the N-th hierarchy; a MAC generating function processing controller that performs control to generate recursively a MAC corresponding to each communication device from the N-th hierarchy to the first hierarchy; and a comparator that compares the received MAC with the generated MAC corresponding to the communication device of the first hierarchy.Type: ApplicationFiled: July 11, 2018Publication date: February 28, 2019Inventor: Daisuke MORIYAMA
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Publication number: 20180337923Abstract: In an authentication method according to an embodiment, a server generates first authentication information configured by a value generated by using a pseudo ransom function using an identifier of an authentication target device and a common key as arguments and transmits the first authentication information to the authentication target device via an authentication proxy client.Type: ApplicationFiled: April 3, 2018Publication date: November 22, 2018Applicant: Renesas Electronics CorporationInventors: Tadaaki TANIMOTO, Daisuke MORIYAMA
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Publication number: 20180167205Abstract: A cryptographic communication method using a dynamically-generated private key is provided. A signal generation unit outputs a second signal obtained by giving an error in a predetermined range to a signal obtained based on a first signal. An error correction generation unit outputs a third signal obtained based on the second signal and auxiliary information for correcting an error included in the second signal. A private-key generation unit generates a first private key based on the third signal. An encryption calculation unit outputs an encrypted signal obtained by encrypting a fourth signal based on the first private key.Type: ApplicationFiled: November 16, 2017Publication date: June 14, 2018Inventor: Daisuke MORIYAMA
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Patent number: 9783796Abstract: The present invention has its object to provide a novel polypeptide having amidase activity to selectively hydrolyze S-enantiomer in racemic nipecotamide, a DNA encoding the polypeptide, a vector containing the DNA, a transformant transformed with the vector, and a method for producing an optically active carboxylic acid amide and an optically active carboxylic acid in which a racemic carboxylic acid amide is hydrolyzed with the polypeptide or the transformant.Type: GrantFiled: March 14, 2008Date of Patent: October 10, 2017Assignee: KANEKA CORPORATIONInventors: Masutoshi Nojiri, Daisuke Moriyama, Tozo Nishiyama, Naoaki Taoka
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Patent number: 9376667Abstract: Water-forming NADH oxidase derived from Streptococcus mutans should be further improved in terms of stability for practical use in industrial production. An object of the present invention is to provide an enzyme that is obtained through modification of a water-forming NADH oxidase, which is useful as an NAD+ regeneration system for stereoselective oxidation catalyzed by an oxidoreductase, by protein engineering techniques so that the enzyme can withstand long-term use without exhibiting a reduction of its activity for the regeneration of NAD+, that is, an enzyme having improved stability, and to provide a method for efficiently producing a useful substance such as an optically active alcohol or amino acid. The present invention relates to an enzyme modification method that can improve the stability of water-forming NADH oxidase derived from Streptococcus mutans by appropriately introducing mutation.Type: GrantFiled: February 1, 2016Date of Patent: June 28, 2016Assignee: Kaneka CorporationInventors: Shinichi Yoshida, Akira Iwasaki, Motohisa Washida, Tozo Nishiyama, Daisuke Moriyama, Naoaki Taoka
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Publication number: 20160145585Abstract: Water-forming NADH oxidase derived from Streptococcus mutans should be further improved in terms of stability for practical use in industrial production. An object of the present invention is to provide an enzyme that is obtained through modification of a water-forming NADH oxidase, which is useful as an NAD+ regeneration system for stereoselective oxidation catalyzed by an oxidoreductase, by protein engineering techniques so that the enzyme can withstand long-term use without exhibiting a reduction of its activity for the regeneration of NAD+, that is, an enzyme having improved stability, and to provide a method for efficiently producing a useful substance such as an optically active alcohol or amino acid. The present invention relates to an enzyme modification method that can improve the stability of water-forming NADH oxidase derived from Streptococcus mutans by appropriately introducing mutation.Type: ApplicationFiled: February 1, 2016Publication date: May 26, 2016Inventors: Shinichi Yoshida, Akira Iwasaki, Motohisa Washida, Tozo Nishiyama, Daisuke Moriyama, Naoaki Taoka
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Patent number: 9315782Abstract: Water-forming NADH oxidase derived from Streptococcus mutans should be further improved in terms of stability for practical use in industrial production. An object of the present invention is to provide an enzyme that is obtained through modification of a water-forming NADH oxidase, which is useful as an NAD+ regeneration system for stereoselective oxidation catalyzed by an oxidoreductase, by protein engineering techniques so that the enzyme can withstand long-term use without exhibiting a reduction of its activity for the regeneration of NAD+, that is, an enzyme having improved stability, and to provide a method for efficiently producing a useful substance such as an optically active alcohol or amino acid. The present invention relates to an enzyme modification method that can improve the stability of water-forming NADH oxidase derived from Streptococcus mutans by appropriately introducing mutation.Type: GrantFiled: January 19, 2011Date of Patent: April 19, 2016Assignee: Kaneka CorporationInventors: Shinichi Yoshida, Akira Iwasaki, Motohisa Washida, Tozo Nishiyama, Daisuke Moriyama, Naoaki Taoka
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Publication number: 20130149769Abstract: The present invention is to provide a process for efficiently producing an optically active alcohol including (R)-3-hydroxy-3-phenylpropanenitrile. One of the features of the present invention is a polypeptide having an activity of asymmetrically reducing 3-oxo-3-phenylpropanenitrile isolated from a microorganism belonging to the genus Candida to product (R)-3-hydroxy-3-phenylpropanenitrile, DNA encoding the polypeptide and a transformant of producing the polypeptide. Another feature of the present invention is a process for producing an optically active alcohol such as (R)-3-hydroxy-3-phenylpropanenitrile by reducing a carbonyl compound such as 3-oxo-3-phenylpropanenitrile by use of the polypeptide or the transformant.Type: ApplicationFiled: April 25, 2011Publication date: June 13, 2013Applicant: KANEKA CORPORATIONInventors: Noriyuki KIZAKI, Makoto UEDA, Daisuke MORIYAMA, Naoaki TAOKA, Yoshihiko YASOHARA
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Publication number: 20130059348Abstract: The present invention has its object to provide a novel polypeptide having amidase activity to selectively hydrolyze S-enantiomer in racemic nipecotamide, a DNA encoding the polypeptide, a vector containing the DNA, a transformant transformed with the vector, and a method for producing an optically active carboxylic acid amide and an optically active carboxylic acid in which a racemic carboxylic acid amide is hydrolyzed with the polypeptide or the transformant.Type: ApplicationFiled: March 14, 2008Publication date: March 7, 2013Applicant: Kaneka CorporationInventors: Masutoshi Nojiri, Daisuke Moriyama, Tozo Nishiyama, Naoaki Taoka
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Publication number: 20130030164Abstract: Water-forming NADH oxidase derived from Streptococcus mutans should be further improved in terms of stability for practical use in industrial production. An object of the present invention is to provide an enzyme that is obtained through modification of a water-forming NADH oxidase, which is useful as an NAD+ regeneration system for stereoselective oxidation catalyzed by an oxidoreductase, by protein engineering techniques so that the enzyme can withstand long-term use without exhibiting a reduction of its activity for the regeneration of NAD+, that is, an enzyme having improved stability, and to provide a method for efficiently producing a useful substance such as an optically active alcohol or amino acid. The present invention relates to an enzyme modification method that can improve the stability of water-forming NADH oxidase derived from Streptococcus mutans by appropriately introducing mutation.Type: ApplicationFiled: January 19, 2011Publication date: January 31, 2013Applicant: Kaneka CorporationInventors: Shinichi Yoshida, Akira Iwasaki, Motohisa Washida, Tozo Nishiyama, Daisuke Moriyama, Naoaki Taoka