Patents by Inventor Tsukasa Kawaoka

Tsukasa Kawaoka 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).

  • Signed document transmission system
    Patent number: 4625076
    Abstract: On the transmitting side, a signature corresponding to a document to be transmitted is generated using a random number and the document as variables and on the basis of a congruent polynomial of second or higher degree with respect to the random number, secret key information and public key information produced based on the secret key information. The signature and the document are transmitted in digital form. On the receiving side, the congruent polynomial is operated using the received signature and document in place of the random number and the document employed on the transmitting side, and the validity of the received signature and document is verified on the basis of the result of the operation and the public key information.
    Type: Grant
    Filed: March 11, 1985
    Date of Patent: November 25, 1986
    Assignee: Nippon Telegraph & Telephone Public Corporation
    Inventors: Tatsuaki Okamoto, Shoji Miyaguchi, Akira Shiraishi, Tsukasa Kawaoka