Patents by Inventor Yuji Kashiwagi

Yuji Kashiwagi 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).

  • Memory device and host device
    Patent number: 10505927
    Abstract: According to one embodiment, a memory device includes: a nonvolatile semiconductor memory; and a controller which controls the semiconductor memory. The controller includes: a first memory which stores a first key; a second memory which stores a second key; a first generator which generates a third key based on a random number; a second generator which generates a fourth key based on the first key and the third key; and an encryptor which encrypts the second key with the third key. The third key and the encrypted second key are stored in a host device enabled to access the memory device.
    Type: Grant
    Filed: November 29, 2018
    Date of Patent: December 10, 2019
    Assignee: TOSHIBA MEMORY CORPORATION
    Inventors: Koichi Nagai, Yuji Kashiwagi
  • MEMORY DEVICE AND HOST DEVICE
    Publication number: 20190173875
    Abstract: According to one embodiment, a memory device includes: a nonvolatile semiconductor memory; and a controller which controls the semiconductor memory. The controller includes: a first memory which stores a first key; a second memory which stores a second key; a first generator which generates a third key based on a random number; a second generator which generates a fourth key based on the first key and the third key; and an encryptor which encrypts the second key with the third key. The third key and the encrypted second key are stored in a host device enabled to access the memory device.
    Type: Application
    Filed: November 29, 2018
    Publication date: June 6, 2019
    Applicant: Toshiba Memory Corporation
    Inventors: Koichi NAGAI, Yuji Kashiwagi
  • Memory device and host device
    Patent number: 10157149
    Abstract: According to one embodiment, a memory device includes: a nonvolatile semiconductor memory; and a controller which controls the semiconductor memory. The controller includes: a first memory which stores a first key; a second memory which stores a second key; a first generator which generates a third key based on a random number; a second generator which generates a fourth key based on the first key and the third key; and an encryptor which encrypts the second key with the third key. The third key and the encrypted second key are stored in a host device enabled to access the memory device.
    Type: Grant
    Filed: December 2, 2015
    Date of Patent: December 18, 2018
    Assignee: TOSHIBA MEMORY CORPORATION
    Inventors: Koichi Nagai, Yuji Kashiwagi
  • MEMORY DEVICE AND HOST DEVICE
    Publication number: 20160154745
    Abstract: According to one embodiment, a memory device includes: a nonvolatile semiconductor memory; and a controller which controls the semiconductor memory. The controller includes: a first memory which stores a first key; a second memory which stores a second key; a first generator which generates a third key based on a random number; a second generator which generates a fourth key based on the first key and the third key; and an encryptor which encrypts the second key with the third key. The third key and the encrypted second key are stored in a host device enabled to access the memory device.
    Type: Application
    Filed: December 2, 2015
    Publication date: June 2, 2016
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Koichi NAGAI, Yuji Kashiwagi