Patents by Inventor Toshiyuki Asanoma

Toshiyuki Asanoma 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 infrastructure (PKI) based system, method, device and program
    Publication number: 20030056099
    Abstract: According to an embodiment of the present invention, an issue system previously issues a smart card, and sends an encrypted private key and a public key certificate to a user terminal, when issuing a new card or updating an old card. A user terminal inputs the received encrypted private key and public key certificate into a smart card. A smart card stores a public key certificate, and decrypts the inputted encrypted private key by an encryptor/decryptor based on a symmetric key, and stores the obtained private key. Therefore, collection and redistribution of a smart card becomes unnecessary, when updating a private key and a public key certificate, saving the time and labor.
    Type: Application
    Filed: September 9, 2002
    Publication date: March 20, 2003
    Inventors: Toshiyuki Asanoma, Shigeyuki Fukushima, Tatsuya Ishihara, Shoji Kitaori