Patents by Inventor Tadakazu Yamanaka

Tadakazu Yamanaka 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: 20220247780
    Abstract: An evaluation-value acquisition unit (102) acquires an evaluation value regarding information security of an evaluated supplier which has been evaluated regarding the information security. A number-of-appearances acquisition unit (105) acquires the number of appearances as to the evaluated supplier of each of two or more keywords regarding the information security in public information. A model generation unit (106) performs multiple regression analysis using the evaluation value of the evaluated supplier and the number of appearances as to the evaluated supplier of each of the two or more keywords in the public information, and generates a regression model whose explanatory variable is the number of appearances of each of the two or more keywords in the public information and whose object variable is the evaluation value.
    Type: Application
    Filed: April 15, 2022
    Publication date: August 4, 2022
    Applicant: Mitsubishi Electric Corporation
    Inventors: Takumi MORI, Tadakazu YAMANAKA, Masahiro FUJITA
  • Publication number: 20180203990
    Abstract: A database (7) stores a first identifier and visiting destination authentication information in association with each other, the first identifier being generated from visitor authentication information which is one of an encrypted face photograph image and key data used for generating the encrypted face photograph image, the visiting destination authentication information being the other of the encrypted face photograph image and the key data. An authentication terminal apparatus (9) receives authentication data from a mobile terminal device (2) used by a visitor (1) who intends to enter a facility and generates a second identifier from the authentication data in the same generation procedure as that of the first identifier.
    Type: Application
    Filed: September 11, 2015
    Publication date: July 19, 2018
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Kazumi SAITO, Nori MATSUDA, Takashi ITO, Tadakazu YAMANAKA, Mitsuhiro HATTORI, Sachihiro ICHIKAWA, Yoichi SHIBATA, Takumi MORI, Takato HIRANO
  • Patent number: 9237013
    Abstract: An invalidation scheme of a secret key is implemented, which is usable for a functional encryption scheme. In a cryptographic processing system 10 employing an encryption scheme with which if attribute information and key information set in encrypted data do not correspond to attribute information and key information set in a secret key, the encrypted data cannot be decrypted using the secret key, an encrypted data management device 200 is provided, which carries out a relay between a user terminal 100 carrying out encryption and decryption of data and an encrypted data storage device 300 storing encrypted data. The encrypted data management device 200 determines whether or not a user whose secret key is invalid is included in users having attribute information set in the encrypted data acquired from the encrypted data storage device 300, and sets a different value as key information in the encrypted data based on the determination result.
    Type: Grant
    Filed: December 20, 2011
    Date of Patent: January 12, 2016
    Assignee: Mitsubishi Electric Corporation
    Inventors: Sachihiro Ichikawa, Nori Matsuda, Tadakazu Yamanaka, Katsuyuki Takashima
  • Publication number: 20140310521
    Abstract: An invalidation scheme of a secret key is implemented, which is usable for a functional encryption scheme. In a cryptographic processing system 10 employing an encryption scheme with which if attribute information and key information set in encrypted data do not correspond to attribute information and key information set in a secret key, the encrypted data cannot be decrypted using the secret key, an encrypted data management device 200 is provided, which carries out a relay between a user terminal 100 carrying out encryption and decryption of data and an encrypted data storage device 300 storing encrypted data. The encrypted data management device 200 determines whether or not a user whose secret key is invalid is included in users having attribute information set in the encrypted data acquired from the encrypted data storage device 300, and sets a different value as key information in the encrypted data based on the determination result.
    Type: Application
    Filed: December 20, 2011
    Publication date: October 16, 2014
    Applicant: Mitsubishi Electric Corporation
    Inventors: Sachihiro Ichikawa, Nori Matsuda, Tadakazu Yamanaka, Katsuyuki Takashima