Patents by Inventor Toshiki NAKASHIMA

Toshiki NAKASHIMA 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).

  • Publication number: 20230299953
    Abstract: According to an embodiment, a quantum cryptographic communication system includes a first quantum key distribution (QKD) device, and a first key management device. The first QKD device that shares a quantum encryption key with a second QKD device through QKD. The first key management device includes a reception unit and a first hardware security module (HSM). The reception unit receives the quantum encryption key from the first QKD device. The first HSM includes a storage unit, a generation unit, and a first encryption unit. The storage unit stores a first encryption key therein. The generation unit generates an application key used in an encryption process by a cryptographic application. The first encryption unit that encrypts, with the first encryption key, the application key transmitted to a second key management device connected to the second QKD device.
    Type: Application
    Filed: August 30, 2022
    Publication date: September 21, 2023
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Kazuaki DOI, Toshiki NAKASHIMA, Mari MATSUMOTO, Yoshimichi TANIZAWA
  • Publication number: 20220393864
    Abstract: A quantum-cryptographic-communication system according to an embodiment includes a key-integrated-management device, quantum-cryptography devices, and key-management-inspection devices. An inspection-target-value-calculating unit calculates an inspection-target value based on quantum-cryptography-device information related to a quantum-cryptography device. An expected-value-calculating unit calculates an expected value based on at least one of wiring information of a QKD link connected to the inspection-target-quantum-cryptography device; weather information of the site installed with the inspection-target-quantum-cryptography device; and the quantum-cryptography-device information. A permissible-value-calculating unit calculates a permissible value based on at least one of the wiring information, the weather information, and the quantum-cryptography-device information.
    Type: Application
    Filed: February 15, 2022
    Publication date: December 8, 2022
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Kazuaki DOI, Yoshimichi TANIZAWA, Toshiki NAKASHIMA, Mari MATSUMOTO