Patents by Inventor Yasuhisa Tokiniwa

Yasuhisa Tokiniwa 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).

  • Encryption communication system capable of reducing network managing workload
    Patent number: 6226385
    Abstract: In an encryption communication system, an encrypt key ID of an encrypt apparatus appearing on a communication path between terminals is acquired by using a key seek packet, and an encrypt key ID is automatically learned based upon a key seek response packet for notifying the acquired encrypt key ID. As a result, communication data between the terminals are encrypted/decrypted, transparently relayed, and discarded by the respective encrypt apparatuses. Even when a communication network is made large and complex, the network for the encrypt communication can be readily managed.
    Type: Grant
    Filed: May 19, 1998
    Date of Patent: May 1, 2001
    Assignees: Mitsubishi Denki Kabushiki Kaisha, Nippon Telegraph & Telephone Corp.
    Inventors: Takuya Taguchi, Toru Inada, Yasuhisa Tokiniwa, Akira Watanabe, Tetsuo Ideguchi, Shigeaki Tanimoto, Hikoyuki Nakajima, Shin-Ichi Kato