Patents by Inventor Izumi Anayama

Izumi Anayama 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).

  • Public key certificate generation method, validation method and apparatus thereof
    Patent number: 7409553
    Abstract: A public key certificate generation method includes the steps of: sending a certificate issuing request including a registration contents of a public key certificate and an information content guaranteed by the registration authority, to the issuing authority in a registration authority and generating a public key certificate including the registration contents described in the certificate issuing request the information guaranteed by the registration authority issuing contents issued by the issuing authority, and a signature to the issuing contents in the issuing authority.
    Type: Grant
    Filed: February 19, 2002
    Date of Patent: August 5, 2008
    Assignee: Hitachi, Ltd.
    Inventors: Yoko Kumagai, Takahiro Fujishiro, Satoru Tezuka, Takanobu Oikawa, Izumi Anayama
  • Public key certificate generation method, validation method and apparatus thereof
    Publication number: 20030097566
    Abstract: A public key certificate generation method includes the steps of: sending a certificate issuing request including a registration contents of a public key certificate and an information content guaranteed by the registration authority, to the issuing authority in a registration authority and generating a public key certificate including the registration contents described in the certificate issuing request the information guaranteed by the registration authority issuing contents issued by the issuing authority, and a signature to the issuing contents in the issuing authority.
    Type: Application
    Filed: February 19, 2002
    Publication date: May 22, 2003
    Inventors: Yoko Kumagai, Takahiro Fujishiro, Satoru Tezuka, Takanobu Oikawa, Izumi Anayama