Patents by Inventor Shigeru Furuta
Shigeru Furuta 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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Patent number: 10469256Abstract: Provided is a cryptographic communication system including a first semiconductor device and a second semiconductor device. The first semiconductor device includes a common key generation unit that generates a common key CK(a) by using a unique code UC(a) and correction data CD(a), and an encryption unit that encrypts the common key CK(a) generated in the common key generation unit by using a public key PK(b) of the second semiconductor device. The second semiconductor device includes a secret key generation unit that generates a secret key SK(b) by using a unique code UC(b) and correction data CD(b), and a decryption unit that decrypts the common key CK(a) encrypted in the encryption unit by using the secret key SK(b).Type: GrantFiled: February 14, 2017Date of Patent: November 5, 2019Assignee: RENESAS ELECTRONICS CORPORATIONInventors: Shigemasa Shiota, Shigeru Furuta, Masayuki Hirokawa, Akira Yamazaki, Daisuke Oshida
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Publication number: 20190164356Abstract: An object of the present invention is to reduce the number of errors generated in an in-vehicle communication device due to a communication failure between the in-vehicle communication device and an IC card. The in-vehicle communication device has a communication unit that performs a first communication with a roadside machine, an interface that performs a second communication with an IC card, a non-volatile memory, and a processing unit that executes a process of collecting a toll using the communication unit. The processing unit stores predetermined information stored in the IC card into the non-volatile memory, uses the information stored in the non-volatile memory when executing a process using the communication unit, and writes the information stored in the non-volatile memory into the IC card at, at least, either timing when the power supply of the in-vehicle communication device 1 is switched to on or off.Type: ApplicationFiled: September 11, 2018Publication date: May 30, 2019Inventors: Yasuhiro SAGESAKA, Shigeru FURUTA
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Patent number: 9931953Abstract: It is intended to provide a safe non-contact charging environment that enables finding an electronic appliance that remains left in a vehicle before start of charging and preventing trouble that an electronic appliance breaks down by electromagnetic waves generated during charging by means of electromagnetic coupling. A process of checking to see that an electronic appliance remains left inside a vehicle, based on wireless communication information emitted by the electronic appliance left inside the vehicle is performed in advance. When it has been detected that an electronic appliance remains left, a charging current value is controlled according to an allowable current of the detected electronic appliance or an alert is generated to notify that the electronic appliance remains left.Type: GrantFiled: February 11, 2015Date of Patent: April 3, 2018Assignee: RENESAS ELECTRONIC CORPORATIONInventors: Daisuke Oshida, Shigeru Furuta
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Publication number: 20170155508Abstract: Provided is a cryptographic communication system including a first semiconductor device and a second semiconductor device. The first semiconductor device includes a common key generation unit that generates a common key CK(a) by using a unique code UC(a) and correction data CD(a), and an encryption unit that encrypts the common key CK(a) generated in the common key generation unit by using a public key PK(b) of the second semiconductor device. The second semiconductor device includes a secret key generation unit that generates a secret key SK(b) by using a unique code UC(b) and correction data CD(b), and a decryption unit that decrypts the common key CK(a) encrypted in the encryption unit by using the secret key SK(b).Type: ApplicationFiled: February 14, 2017Publication date: June 1, 2017Inventors: Shigemasa Shiota, Shigeru Furuta, Masayuki Hirokawa, Akira Yamazaki, Daisuke Oshida
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Patent number: 9608818Abstract: Provided is a cryptographic communication system including a first semiconductor device and a second semiconductor device. The first semiconductor device includes a common key generation unit that generates a common key CK(a) by using a unique code UC(a) and correction data CD(a), and an encryption unit that encrypts the common key CK(a) generated in the common key generation unit by using a public key PK(b) of the second semiconductor device. The second semiconductor device includes a secret key generation unit that generates a secret key SK(b) by using a unique code UC(b) and correction data CD(b), and a decryption unit that decrypts the common key CK(a) encrypted in the encryption unit by using the secret key SK(b).Type: GrantFiled: February 4, 2015Date of Patent: March 28, 2017Assignee: RENESAS ELECTRONICS CORPORATIONInventors: Shigemasa Shiota, Shigeru Furuta, Masayuki Hirokawa, Akira Yamazaki, Daisuke Oshida
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Patent number: 9363082Abstract: Provided is a cryptographic communication system including a first semiconductor device and a second semiconductor device. The first semiconductor device includes a common key generation unit that generates a common key CK(a) by using a unique code UC(a) and correction data CD(a), and an encryption unit that encrypts the common key CK(a) generated in the common key generation unit by using a public key PK(b) of the second semiconductor device. The second semiconductor device includes a secret key generation unit that generates a secret key SK(b) by using a unique code UC(b) and correction data CD(b), and a decryption unit that decrypts the common key CK(a) encrypted in the encryption unit by using the secret key SK(b).Type: GrantFiled: June 13, 2012Date of Patent: June 7, 2016Assignee: RENESAS ELECTRONICS CORPORATIONInventors: Shigemasa Shiota, Shigeru Furuta, Masayuki Hirokawa, Akira Yamazaki, Daisuke Oshida
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Patent number: 9300470Abstract: A semiconductor device has: a unique code generating unit generating an initial unique code which is a value unique to a device and includes an error in a random bit; a first error correcting unit correcting an error in the initial unique code to generate an intermediate unique code; a second error correcting unit correcting an error in the intermediate unique code to generate a first determinate unique code; and a decrypting unit decrypting, with the first determinate unique code, transmission data obtained by encrypting confidential information with key information generated on the basis of the intermediate unique code by an external device to generate confidential information.Type: GrantFiled: March 27, 2015Date of Patent: March 29, 2016Assignee: Renesas Electronics CorporationInventors: Daisuke Oshida, Shigeru Furuta, Masayuki Hirokawa, Akira Yamazaki, Takashi Fujimori, Shigemasa Shiota
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Patent number: 9245153Abstract: A semiconductor device in related art has a problem that security on confidential information stored is insufficient. A semiconductor device of the present invention has a unique code which is unique to a device and generates unique code corresponding information from the unique code. The semiconductor device has a memory region in which specific information obtained by encrypting confidential information is stored in a region associated with the unique code corresponding information. The specific information read from the memory region is encrypted with the unique code corresponding information to generate the confidential information.Type: GrantFiled: June 3, 2014Date of Patent: January 26, 2016Assignee: Renesas Electronics CorporationInventors: Daisuke Oshida, Masayuki Hirokawa, Akira Yamazaki, Takashi Fujimori, Shigemasa Shiota, Shigeru Furuta
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Publication number: 20150239355Abstract: It is intended to provide a safe non-contact charging environment that enables finding an electronic appliance that remains left in a vehicle before start of charging and preventing trouble that an electronic appliance breaks down by electromagnetic waves generated during charging by means of electromagnetic coupling. A process of checking to see that an electronic appliance remains left inside a vehicle, based on wireless communication information emitted by the electronic appliance left inside the vehicle is performed in advance. When it has been detected that an electronic appliance remains left, a charging current value is controlled according to an allowable current of the detected electronic appliance or an alert is generated to notify that the electronic appliance remains left.Type: ApplicationFiled: February 11, 2015Publication date: August 27, 2015Inventors: Daisuke Oshida, Shigeru Furuta
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Publication number: 20150207629Abstract: A semiconductor device in related art has a problem that security at the time of writing data cannot be sufficiently assured. A semiconductor device of the present invention has: a unique code generating unit generating an initial unique code which is a value unique to a device and includes an error in a random bit; a first error correcting unit correcting an error in the initial unique code to generate an intermediate unique code; a second error correcting unit correcting an error in the intermediate unique code to generate a first determinate unique code; and a decrypting unit decrypting, with the first determinate unique code, transmission data obtained by encrypting confidential information with key information generated on the basis of the intermediate unique code by an external device to generate confidential information.Type: ApplicationFiled: March 27, 2015Publication date: July 23, 2015Inventors: Daisuke OSHIDA, Shigeru FURUTA, Masayuki HIROKAWA, Akira YAMAZAKI, Takashi FUJIMORI, Shigemasa SHIOTA
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Publication number: 20150156021Abstract: Provided is a cryptographic communication system including a first semiconductor device and a second semiconductor device. The first semiconductor device includes a common key generation unit that generates a common key CK(a) by using a unique code UC(a) and correction data CD(a), and an encryption unit that encrypts the common key CK(a) generated in the common key generation unit by using a public key PK(b) of the second semiconductor device. The second semiconductor device includes a secret key generation unit that generates a secret key SK(b) by using a unique code UC(b) and correction data CD(b), and a decryption unit that decrypts the common key CK(a) encrypted in the encryption unit by using the secret key SK(b).Type: ApplicationFiled: February 4, 2015Publication date: June 4, 2015Inventors: Shigemasa Shiota, Shigeru Furuta, Masayuki Hirokawa, Akira Yamazaki, Daisuke Oshida
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Patent number: 9026882Abstract: A semiconductor device has: a unique code generating unit generating an initial unique code which is a value unique to a device and includes an error in a random bit; a first error correcting unit correcting an error in the initial unique code to generate an intermediate unique code; a second error correcting unit correcting an error in the intermediate unique code to generate a first determinate unique code; and a decrypting unit decrypting, with the first determinate unique code, transmission data obtained by encrypting confidential information with key information generated on the basis of the intermediate unique code by an external device to generate confidential information.Type: GrantFiled: June 15, 2012Date of Patent: May 5, 2015Assignee: Renesas Electronics CorporationInventors: Daisuke Oshida, Shigeru Furuta, Masayuki Hirokawa, Akira Yamazaki, Takashi Fujimori, Shigemasa Shiota
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Publication number: 20140289538Abstract: A semiconductor device in related art has a problem that security on confidential information stored is insufficient. A semiconductor device of the present invention has a unique code which is unique to a device and generates unique code corresponding information from the unique code. The semiconductor device has a memory region in which specific information obtained by encrypting confidential information is stored in a region associated with the unique code corresponding information. The specific information read from the memory region is encrypted with the unique code corresponding information to generate the confidential information.Type: ApplicationFiled: June 3, 2014Publication date: September 25, 2014Applicant: Renesas Electronics CorporationInventors: Daisuke OSHIDA, Masayuki HIROKAWA, Akira YAMAZAKI, Takashi FUJIMORI, Shigemasa SHIOTA, Shigeru FURUTA
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Patent number: 8782432Abstract: A semiconductor device in related art has a problem that security on confidential information stored is insufficient. A semiconductor device of the present invention has a unique code which is unique to a device and generates unique code corresponding information from the unique code. The semiconductor device has a memory region in which specific information obtained by encrypting confidential information is stored in a region associated with the unique code corresponding information. The specific information read from the memory region is encrypted with the unique code corresponding information to generate the confidential information.Type: GrantFiled: June 15, 2012Date of Patent: July 15, 2014Assignee: Renesas Electronics CorporationInventors: Daisuke Oshida, Masayuki Hirokawa, Akira Yamazaki, Takashi Fujimori, Shigemasa Shiota, Shigeru Furuta
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Publication number: 20120324310Abstract: A semiconductor device in related art has a problem that security at the time of writing data cannot be sufficiently assured. A semiconductor device of the present invention has: a unique code generating unit generating an initial unique code which is a value unique to a device and includes an error in a random bit; a first error correcting unit correcting an error in the initial unique code to generate an intermediate unique code; a second error correcting unit correcting an error in the intermediate unique code to generate a first determinate unique code; and a decrypting unit decrypting, with the first determinate unique code, transmission data obtained by encrypting confidential information with key information generated on the basis of the intermediate unique code by an external device to generate confidential information.Type: ApplicationFiled: June 15, 2012Publication date: December 20, 2012Inventors: Daisuke OSHIDA, Shigeru Furuta, Masayuki Hirokawa, Akira Yamazaki, Takashi Fujimori, Shigemasa Shiota
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Publication number: 20120321077Abstract: Provided is a cryptographic communication system including a first semiconductor device and a second semiconductor device. The first semiconductor device includes a common key generation unit that generates a common key CK(a) by using a unique code UC(a) and correction data CD(a), and an encryption unit that encrypts the common key CK(a) generated in the common key generation unit by using a public key PK(b) of the second semiconductor device. The second semiconductor device includes a secret key generation unit that generates a secret key SK(b) by using a unique code UC(b) and correction data CD(b), and a decryption unit that decrypts the common key CK(a) encrypted in the encryption unit by using the secret key SK(b).Type: ApplicationFiled: June 13, 2012Publication date: December 20, 2012Inventors: Shigemasa SHIOTA, Shigeru Furuta, Masayuki Hirokawa, Akira Yamazaki, Daisuke Oshida
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Publication number: 20120324241Abstract: A semiconductor device in related art has a problem that security on confidential information stored is insufficient. A semiconductor device of the present invention has a unique code which is unique to a device and generates unique code corresponding information from the unique code. The semiconductor device has a memory region in which specific information obtained by encrypting confidential information is stored in a region associated with the unique code corresponding information. The specific information read from the memory region is encrypted with the unique code corresponding information to generate the confidential information.Type: ApplicationFiled: June 15, 2012Publication date: December 20, 2012Inventors: Daisuke OSHIDA, Masayuki Hirokawa, Akira Yamazaki, Takashi Fujimori, Shigemasa Shiota, Shigeru Furuta
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Patent number: 5698837Abstract: Even when a plurality of cards have entered an communication area, the cards within the communication area may be accessible, and, if a data collision occurs, the order of accessing to the cards is expeditiously determined to perform an efficient communication. Each card determines a timing for returning a response block containing an ID code based on conditions directed by a read/write device and the ID code of its own. The read/write device is caused to receive the response block returned by the contactless IC card and to detect a data collision. Based on this result, the conditions are changed so that a respective response block containing an ID code is returned again, thereby concurrently processing the plurality of contactless IC cards.Type: GrantFiled: October 6, 1995Date of Patent: December 16, 1997Assignee: Mitsubishi Denki Kabushiki KaishaInventor: Shigeru Furuta
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Patent number: 5585617Abstract: A non-contact IC card capable of communicating with external equipment at various communication frequencies. An antenna circuit of variable frequency and a frequency switching circuit for supplying communication clock signals of variable frequency to a modulator-demodulator circuit are provided so that communication is performed by switching a constant of the antenna circuit and the frequency of the communication clock signal generated from the frequency switching circuit in accordance with the frequency of external equipment with which communication is effected.Type: GrantFiled: July 11, 1995Date of Patent: December 17, 1996Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Jun Ohbuchi, Shigeru Furuta, Tetsuro Washida
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Patent number: 5225667Abstract: An IC card prevents an internal battery from being, rapidly consumed and internal data from being lost due to frequent use or erroneous starts caused by external noise. The number of starts of the card and the number of erroneous starts thereof are respectively counted by registers in a RAM. When one of these start numbers reaches a set value, the receiving circuit selected is switched to another receiving circuit having a higher threshold value and requiring no bias current, or the threshold value of the receiving circuit is increased by an inhibit circuit so that the internal power consumption of the card is suppressed, and the card is not affected by external noise. In addition, when the value of one of the registers reaches a set value, the external device informs the user of the fact that the value has reached a set value, using sound or a visual display.Type: GrantFiled: December 26, 1991Date of Patent: July 6, 1993Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Shigeru Furuta, Etsushi Takebayashi