Patents by Inventor Maki Shigeri

Maki Shigeri 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 method, decryption method, device, and program
    Patent number: 8619976
    Abstract: An encryption/decryption method comprises by using a generalized Feistel structure in which data is divided into n pieces and mixing processing with key data is performed, diffusion processing, in which data transformation via linear operation is executed, is performed at least once between rounds of the generalized Feistel structure, wherein. As the diffusion processing, linear transformation is performed in which each of n pieces of output data is operated on by two or more pieces of input data. The method is adapted for encryption or decryption.
    Type: Grant
    Filed: December 11, 2008
    Date of Patent: December 31, 2013
    Assignees: NEC Corporation, NEC Software Hokuriku, Ltd.
    Inventors: Tomoyasu Suzaki, Yukiyasu Tsunoo, Hiroyasu Kubo, Maki Shigeri, Teruo Saito, Takeshi Kawabata, Hiroki Nakashima
  • DATA TRANSMISSION DEVICE, DATA RECEPTION DEVICE, METHODS THEREOF, RECORDING MEDIUM, AND DATA COMMUNICATION SYSTEM THEREFOR
    Publication number: 20110110519
    Abstract: A data transmission device (100) performs encryption processing on transmission data, performs encryption processing of a Feistel structure on the obtained first converted data, and performs processing in the relationship of an inverse function with the first encryption processing on the obtained second converted data. A first converting unit (105) divides transmission data into N sets (N being three or greater) of divided transmission data, performs operation processing on the divided transmission data to generate at least N sets of operation processing data, and combines the generated N sets of operation processing data to generate the first converted data.
    Type: Application
    Filed: January 9, 2009
    Publication date: May 12, 2011
    Inventors: Tomoyasu Suzaki, Yukiyasu Tsunoo, Hiroyasu Kubo, Maki Shigeri, Teruo Saito, Takeshi Kawabata, Hiroki Nakashima
  • ENCRYPTION METHOD, DECRYPTION METHOD, DEVICE, AND PROGRAM
    Publication number: 20100266122
    Abstract: An encryption/decryption method comprises by using a generalized Feistel structure in which data is divided into n pieces and mixing processing with key data is performed, diffusion processing, in which data transformation via linear operation is executed, is performed at least once between rounds of the generalized Feistel structure, wherein. As the diffusion processing, linear transformation is performed in which each of n pieces of output data is operated on by two or more pieces of input data. The method is adapted for encryption or decryption.
    Type: Application
    Filed: December 11, 2008
    Publication date: October 21, 2010
    Applicants: NEC CORPORATION, NEC SOFTWARE HOKURIKU, LTD.
    Inventors: Tomoyasu Suzaki, Yukiyasu Tsunoo, Hiroyasu Kubo, Maki Shigeri, Teruo Saito, Takeshi Kawabata, Hiroki Nakashima