Patents by Inventor Takehiro Ohkoshi

Takehiro Ohkoshi 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).

  • Authenticating device, authenticated device and key updating method
    Patent number: 7721092
    Abstract: An authenticating device 100 includes an authentication processing unit 197 to perform an authentication process with a communication device 200 using an authentication key, an update key generating unit 160 to generate a new authentication key when the communication device 200 does not hold an authentication key to be used in the authentication process by the authentication processing unit 197, and to generate a new authentication key for updating the authentication key when the communication device 200 holds the authentication key but the authentication process with the communication device 200 by the authentication processing unit 197 fails. The authentication processing unit 197 performs again the authentication process with the communication device 200 using the new authentication key generated by the update key generating unit 160.
    Type: Grant
    Filed: April 23, 2004
    Date of Patent: May 18, 2010
    Assignee: Mitsubishi Electric Corporation
    Inventors: Takehiro Ohkoshi, Keiki Yamada, Satoru Makita
  • Authenticated device, authenticating device and authenticating method
    Publication number: 20070211892
    Abstract: An authenticated device 200 includes a memory unit 220 to store at least one algorithm identifier and at least one encryption key identifier, a transmitting unit 212 to transmit at least one algorithm identifier and at least one encryption key identifier stored by the memory unit 220 to an authenticating device 100, a receiving unit 211 to receive a prescribed algorithm identifier and a prescribed encryption key identifier selected from among at least one algorithm identifier and at least one encryption key identifier transmitted by the transmitting unit 212 from the authenticating device 100, and an authentication processing unit 296 to perform an authentication process with the authenticating device 100 based on the prescribed algorithm identifier and the prescribed encryption key identifier received by the receiving unit 211.
    Type: Application
    Filed: April 23, 2004
    Publication date: September 13, 2007
    Applicant: Mitsubishi Electric Corporation
    Inventor: Takehiro Ohkoshi
  • Authenticating device, authenticated device and key updating method
    Publication number: 20070150731
    Abstract: An authenticating device 100 includes an authentication processing unit 197 to perform an authentication process with a communication device 200 using an authentication key, an update key generating unit 160 to generate a new authentication key when the communication device 200 does not hold an authentication key to be used in the authentication process by the authentication processing unit 197, and to generate a new authentication key for updating the authentication key when the communication device 200 holds the authentication key but the authentication process with the communication device 200 by the authentication processing unit 197 fails. The authentication processing unit 197 performs again the authentication process with the communication device 200 using the new authentication key generated by the update key generating unit 160.
    Type: Application
    Filed: April 23, 2004
    Publication date: June 28, 2007
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Takehiro Ohkoshi, Keiki Yamada, Satoru Makita