Patents by Inventor Kentaro Umesawa
Kentaro Umesawa 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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Communication connection method, authentication method, server computer, client computer and program
Patent number: 7366170Abstract: Communication connection method for connecting server computer to client computer via network, comprises storing group identification information items for identifying groups, in relation to information indicating number of connection request packets uniquely and secretly allocated to each group of groups, each group including users allowed to access server computer, counting connection request packets received from client computer within preset period to obtain counted number, determining whether information corresponds to counted number, acquiring one group of groups to which connection request packets corresponding to counted number are allocated, if information corresponds to counted number, determining whether resources of server computer are allocated to group indicated by acquired group identification item, generating connection request acknowledgement packet in response to at least one of received connection request packets, and transmitting generated connection request acknowledgement packet to netwoType: GrantFiled: September 24, 2004Date of Patent: April 29, 2008Assignee: Kabushiki Kaisha ToshibaInventors: Kentaro Umesawa, Toshinari Takahashi -
Publication number: 20080082817Abstract: An authenticating device communicating with a server device includes: a dividing unit that divides secret information into plural secret fragments by a threshold secret sharing scheme; a first generating unit that generates plural cryptographic fragments by encrypting the secret fragments using first plural passwords; a first transmitting unit that transmits the cryptographic fragments to the server device; a first receiving unit that receives the cryptographic fragments from the server device, a second generating unit that generates plural secret fragment candidates by decrypting the cryptographic fragments using second plural passwords; a third generating unit that obtains a verifying information candidate by the threshold secret sharing scheme using a group of the secret fragment candidates; a second transmitting unit that transmits the verifying information candidate to the server device; and a second receiving unit that receives result information of comparing the verifying information candidate with verType: ApplicationFiled: March 21, 2007Publication date: April 3, 2008Applicant: Kabushiki Kaisha ToshibaInventors: Toshinari Takahashi, Kentaro Umesawa, Shinji Yamanaka
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Patent number: 7182264Abstract: A method of setting validity period of IC card, includes preparing IC card including change unit whose state changes with lapse of time starting from initial state without external power, measuring unit configured to measure state of change unit so as to generate information indicating whether or not validity period has elapsed, and operation unit configured to be operable if information indicates that validity period fails to have yet elapsed, and to be inoperable if information indicates that validity period has elapsed, preparing IC card case capable to house IC card by user, IC card case including identification unit configured to determine whether or not user is legitimate, performing user identification utilizing identification unit, when IC card is housed in IC card case, and transmitting signal to change unit in IC card depending on result of user identification, signal initializing change unit to initial state.Type: GrantFiled: April 27, 2006Date of Patent: February 27, 2007Assignee: Kabushiki Kaisha ToshibaInventors: Yuuki Tomoeda, Hiroshi Watanabe, Hideo Shimizu, Kenji Kojima, Tatsuyuki Matsushita, Kentaro Umesawa, Hideyuki Miyake
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Patent number: 7182251Abstract: A method of setting validity period of IC card, includes preparing IC card including change unit whose state changes with lapse of time starting from initial state without external power, measuring unit configured to measure state of change unit so as to generate information indicating whether or not validity period has elapsed, and operation unit configured to be operable if information indicates that validity period fails to have yet elapsed, and to be inoperable if information indicates that validity period has elapsed, preparing IC card case capable to house IC card by user, IC card case including identification unit configured to determine whether or not user is legitimate, performing user identification utilizing identification unit, when IC card is housed in IC card case, and transmitting signal to change unit in IC card depending on result of user identification, signal initializing change unit to initial state.Type: GrantFiled: April 27, 2006Date of Patent: February 27, 2007Assignee: Kabushiki Kaisha ToshibaInventors: Yuuki Tomoeda, Hiroshi Watanabe, Hideo Shimizu, Kenji Kojima, Tatsuyuki Matsushita, Kentaro Umesawa, Hideyuki Miyake
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Patent number: 7134600Abstract: A method of setting validity period of IC card, comprises preparing IC card including change unit whose state changes with lapse of time starting from initial state without external power, measuring unit configured to measure state of change unit so as to generate information indicating whether or not validity period has elapsed, and operation unit configured to be operable if information indicates that validity period fails to have yet elapsed, and to be inoperable if information indicates that validity period has elapsed, preparing IC card case capable to house IC card by user, IC card case including identification unit configured to determine whether or not user is legitimate, performing user identification utilizing identification unit, when IC card is housed in IC card case, and transmitting signal to change unit in IC card depending on result of user identification, signal initializing change unit to initial state.Type: GrantFiled: November 25, 2003Date of Patent: November 14, 2006Assignee: Kabushiki Kaisha ToshibaInventors: Yuuki Tomoeda, Hiroshi Watanabe, Hideo Shimizu, Kenji Kojima, Tatsuyuki Matsushita, Kentaro Umesawa, Hideyuki Miyake
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Patent number: 7121472Abstract: A semiconductor integrated circuit driven by an external power, comprises a change unit whose state changes with lapse of time without the external power, an output unit configured to output a signal in response to an instruction issued when the external power is supplied, the signal indicating a change of the state of the change unit, and an execution unit configured to execute a process in response to the signal. Therefore, the circuit is capable of utilizing time-point/time-period information even if they are not supplied with power.Type: GrantFiled: November 25, 2003Date of Patent: October 17, 2006Assignee: Kabushiki Kaisha ToshibaInventors: Hideo Shimizu, Kenji Kojima, Tatsuyuki Matsushita, Yuuki Tomoeda, Kentaro Umesawa, Hideyuki Miyake, Hiroshi Watanabe
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Publication number: 20060208068Abstract: A method of setting validity period of IC card, includes preparing IC card including change unit whose state changes with lapse of time starting from initial state without external power, measuring unit configured to measure state of change unit so as to generate information indicating whether or not validity period has elapsed, and operation unit configured to be operable if information indicates that validity period fails to have yet elapsed, and to be inoperable if information indicates that validity period has elapsed, preparing IC card case capable to house IC card by user, IC card case including identification unit configured to determine whether or not user is legitimate, performing user identification utilizing identification unit, when IC card is housed in IC card case, and transmitting signal to change unit in IC card depending on result of user identification, signal initializing change unit to initial state.Type: ApplicationFiled: April 27, 2006Publication date: September 21, 2006Inventors: Yuuki Tomoeda, Hiroshi Watanabe, Hideo Shimizu, Kenji Kojima, Tatsuyuki Matsushita, Kentaro Umesawa, Hideyuki Miyake
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Publication number: 20060196933Abstract: A method of setting validity period of IC card, includes preparing IC card including change unit whose state changes with lapse of time starting from initial state without external power, measuring unit configured to measure state of change unit so as to generate information indicating whether or not validity period has elapsed, and operation unit configured to be operable if information indicates that validity period fails to have yet elapsed, and to be inoperable if information indicates that validity period has elapsed, preparing IC card case capable to house IC card by user, IC card case including identification unit configured to determine whether or not user is legitimate, performing user identification utilizing identification unit, when IC card is housed in IC card case, and transmitting signal to change unit in IC card depending on result of user identification, signal initializing change unit to initial state.Type: ApplicationFiled: April 27, 2006Publication date: September 7, 2006Inventors: Yuuki Tomoeda, Hiroshi Watanabe, Hideo Shimizu, Kenji Kojima, Tatsuyuki Matsushita, Kentaro Umesawa, Hideyuki Miyake
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Publication number: 20060192020Abstract: A method of setting validity period of IC card, includes preparing IC card including change unit whose state changes with lapse of time starting from initial state without external power, measuring unit configured to measure state of change unit so as to generate information indicating whether or not validity period has elapsed, and operation unit configured to be operable if information indicates that validity period fails to have yet elapsed, and to be inoperable if information indicates that validity period has elapsed, preparing IC card case capable to house IC card by user, IC card case including identification unit configured to determine whether or not user is legitimate, performing user identification utilizing identification unit, when IC card is housed in IC card case, and transmitting signal to change unit in IC card depending on result of user identification, signal initializing change unit to initial state.Type: ApplicationFiled: April 27, 2006Publication date: August 31, 2006Inventors: Yuuki Tomoeda, Hiroshi Watanabe, Hideo Shimizu, Kenji Kojima, Tatsuyuki Matsushita, Kentaro Umesawa, Hideyuki Miyake
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Publication number: 20060161667Abstract: A server computer and a client computer determine a method of storing user identification information into a connection request packet therebetween. When establishing a connection with the server computer, the client computer stores its own user identification information in a server application into a connection request packet and transmits it. The server computer extracts the converted user identification information, and refers to a task storage table of the application based on the user identification information, and in the case where the task exists, the server computer transmits a connection request acknowledgement packet and establishes the connection.Type: ApplicationFiled: December 27, 2005Publication date: July 20, 2006Inventors: Kentaro Umesawa, Toshinari Takahashi
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Patent number: 6945467Abstract: IC card receiving power from terminal and performing process, IC card comprises storage storing first identification information uniquely assigned to IC card, acquisition unit acquiring second identification information from terminal, first timer including first change unit whose state changes with lapse of time without power, state of first change unit changing from first initial state to final state via intermediate state, first timer outputting first signal indicative of changed state of first change unit when IC card receives power, comparison unit comparing second identification information with first identification information, determining whether second identification information and first identification information are identical, and providing first initializing signal according to at least one of determined results, and controller initializing first change unit to first initial state when receiving first initializing signal, controller further controlling IC card to make it inhibit process until statType: GrantFiled: October 18, 2004Date of Patent: September 20, 2005Assignee: Kabushiki Kaisha ToshibaInventors: Kenji Kojima, Kentaro Umesawa, Hideyuki Miyake, Tatsuyuki Matsushita, Yuuki Tomoeda, Hideo Shimizu, Hiroshi Watanabe
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Communication connection method, authentication method, server computer, client computer and program
Publication number: 20050094637Abstract: Communication connection method for connecting server computer to client computer via network, comprises storing group identification information items for identifying groups, in relation to information indicating number of connection request packets uniquely and secretly allocated to each group of groups, each group including users allowed to access server computer, counting connection request packets received from client computer within preset period to obtain counted number, determining whether information corresponds to counted number, acquiring one group of groups to which connection request packets corresponding to counted number are allocated, if information corresponds to counted number, determining whether resources of server computer are allocated to group indicated by acquired group identification item, generating connection request acknowledgement packet in response to at least one of received connection request packets, and transmitting generated connection request acknowledgement packet to netwoType: ApplicationFiled: September 24, 2004Publication date: May 5, 2005Inventors: Kentaro Umesawa, Toshinari Takahashi -
Publication number: 20050045731Abstract: IC card receiving power from terminal and performing process, IC card comprises storage storing first identification information uniquely assigned to IC card, acquisition unit acquiring second identification information from terminal, first timer including first change unit whose state changes with lapse of time without power, state of first change unit changing from first initial state to final state via intermediate state, first timer outputting first signal indicative of changed state of first change unit when IC card receives power, comparison unit comparing second identification information with first identification information, determining whether second identification information and first identification information are identical, and providing first initializing signal according to at least one of determined results, and controller initializing first change unit to first initial state when receiving first initializing signal, controller further controlling IC card to make it inhibit process until statType: ApplicationFiled: October 18, 2004Publication date: March 3, 2005Inventors: Kenji Kojima, Kentaro Umesawa, Hideyuki Miyake, Tatsuyuki Matsushita, Yuuki Tomoeda, Hideo Shimizu, Hiroshi Watanabe
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Publication number: 20050013440Abstract: There is disclosed a contract management apparatus connected to a plurality of broadcasting receiving devices which receive encrypted and broadcasted/distributed content information of a plurality of broadcasting channels and a channel key for decrypting the content information via a first network. The contract management apparatus receives and stores key information for decrypting the channel key via a second network, and distributes the stored key information in response to a request from the broadcasting receiving devices via the first network, until a total value of points indicating a value of the content information decrypted using the key information, a see/hear time, or a combination of these becomes equal to a predetermined upper limit value in the plurality of broadcasting receiving devices.Type: ApplicationFiled: June 2, 2004Publication date: January 20, 2005Inventors: Koichiro Akiyama, Kentaro Umesawa
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Patent number: 6811083Abstract: IC card receiving power from terminal and performing process, IC card comprises storage storing first identification information uniquely assigned to IC card, acquisition unit acquiring second identification information from terminal, first timer including first change unit whose state changes with lapse of time without power, state of first change unit changing from first initial state to final state via intermediate state, first timer outputting first signal indicative of changed state of first change unit when IC card receives power, comparison unit comparing second identification information with first identification information, determining whether second identification information and first identification information are identical, and providing first initializing signal according to at least one of determined results, and controller initializing first change unit to first initial state when receiving first initializing signal, controller further controlling IC card to make it inhibit process until statType: GrantFiled: November 25, 2003Date of Patent: November 2, 2004Assignee: Kabushiki Kaisha ToshibaInventors: Kenji Kojima, Kentaro Umesawa, Hideyuki Miyake, Tatsuyuki Matsushita, Yuuki Tomoeda, Hideo Shimizu, Hiroshi Watanabe
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Publication number: 20040149816Abstract: A method of setting validity period of IC card, comprises preparing IC card including change unit whose state changes with lapse of time starting from initial state without external power, measuring unit configured to measure state of change unit so as to generate information indicating whether or not validity period has elapsed, and operation unit configured to be operable if information indicates that validity period fails to have yet elapsed, and to be inoperable if information indicates that validity period has elapsed, preparing IC card case capable to house IC card by user, IC card case including identification unit configured to determine whether or not user is legitimate, performing user identification utilizing identification unit, when IC card is housed in IC card case, and transmitting signal to change unit in IC card depending on result of user identification, signal initializing change unit to initial state.Type: ApplicationFiled: November 25, 2003Publication date: August 5, 2004Inventors: Yuuki Tomoeda, Hiroshi Watanabe, Hideo Shimizu, Kenji Kojima, Tatsuyuki Matsushita, Kentaro Umesawa, Hideyuki Miyake
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Publication number: 20040150468Abstract: A semiconductor integrated circuit driven by an external power, comprises a change unit whose state changes with lapse of time without the external power, an output unit configured to output a signal in response to an instruction issued when the external power is supplied, the signal indicating a change of the state of the change unit, and an execution unit configured to execute a process in response to the signal. Therefore, the circuit is capable of utilizing time-point/time-period information even if they are not supplied with power.Type: ApplicationFiled: November 25, 2003Publication date: August 5, 2004Inventors: Hideo Shimizu, Kenji Kojima, Tatsuyuki Matsushita, Yuuki Tomoeda, Kentaro Umesawa, Hideyuki Miyake, Hiroshi Watanabe
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Publication number: 20040124250Abstract: IC card receiving power from terminal and performing process, IC card comprises storage storing first identification information uniquely assigned to IC card, acquisition unit acquiring second identification information from terminal, first timer including first change unit whose state changes with lapse of time without power, state of first change unit changing from first initial state to final state via intermediate state, first timer outputting first signal indicative of changed state of first change unit when IC card receives power, comparison unit comparing second identification information with first identification information, determining whether second identification information and first identification information are identical, and providing first initializing signal according to at least one of determined results, and controller initializing first change unit to first initial state when receiving first initializing signal, controller further controlling IC card to make it inhibit process until statType: ApplicationFiled: November 25, 2003Publication date: July 1, 2004Inventors: Kenji Kojima, Kentaro Umesawa, Hideyuki Miyake, Tatsuyuki Matsushita, Yuuki Tomoeda, Hideo Shimizu, Hiroshi Watanabe