Patents by Inventor Mayuko Shimizu

Mayuko Shimizu 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).

  • Patent number: 6504931
    Abstract: In the process of compressing and encrypting data, without an increase of processing time, a cipher capability is secured against the latest cryptanalysis such as differential and linear cryptanalyses. The differential and linear cryptanalyses are executed to collect plural pairs of plaintext and cryptosystem for the same key and perform the statistical operation for estimating the key. An input/output (I/O) process is executed to receive plaintext data and generate a different key for each data on the random number and set the key to a work key. The encrypted intermediate result or the pre-encrypted result is fed back to permit frequent changing of the work key. The changing operation is executed to change correspondence between the plaintext data and the compressed data in the compressing process.
    Type: Grant
    Filed: November 9, 2000
    Date of Patent: January 7, 2003
    Assignee: Hitachi, Ltd.
    Inventors: Hiroshi Yoshiura, Kazuo Takaragi, Mayuko Shimizu
  • Patent number: 6157720
    Abstract: In the process of compressing and encrypting data, without increase of a processing time, a cipher capability is secured against the latest cryptanalysis such as differential and linear cryptanalyses. The differential and linear cryptanalyses are executed to collect plural pair of plaintext and cryptosystem for the same key and perform the statistical operation for estimating the key. An I/O process is executed to receive plaintext data and generate a random number. Then, an operation is executed to generate a different key for each data on the random number and set the key to a work key. The encrypted intermediate result or the pre-encrypted result is fed back for frequently changing the work key. These series of operations makes it possible to protect the ciphertext from the differential and the linear cryptanalyses.
    Type: Grant
    Filed: February 26, 1997
    Date of Patent: December 5, 2000
    Assignee: Hitachi, Ltd.
    Inventors: Hiroshi Yoshiura, Kazuo Takaragi, Mayuko Shimizu