Patents by Inventor Katsumasa Watanabe

Katsumasa Watanabe 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).

  • Microprocessor, a node terminal, a computer system and a program execution proving method
    Patent number: 7577852
    Abstract: A node terminal including an internal memory for saving a program transmitted from a server, a CPU for executing the program, a hash value calculating section for performing an operation of the program using a specified hash function when the execution of the program is completed, and a digital signature executing section for digitally signing the program operated using the hash function and the execution result of the program, using a secret key peculiar to the node and saved in a secret key storage, and a microprocessor capable of guaranteeing that the content of a memory is not unjustly falsified during the execution of the program.
    Type: Grant
    Filed: July 13, 2005
    Date of Patent: August 18, 2009
    Assignee: National University Corporation Nara Institute of Science and Technology
    Inventors: Atsuya Okazaki, Masaki Nakanishi, Shigeru Yamashita, Katsumasa Watanabe
  • Microprocessor, a node terminal, a computer system and a program execution proving method
    Publication number: 20060161773
    Abstract: A node 10 is provided with an internal memory 42 for saving a program transmitted from a server 20, a CPU 41 for executing the program saved in the internal memory 42, a hash value calculating section 103 for performing an operation of the program executed by the CPU 41 using a specified hash function when the execution of the program is completed, and a digital signature executing section 104 for digitally signing the program operated using the hash function and the execution result of the program, using a secret key peculiar to the node 10 and saved in a secret key storage 105. Accordingly, there can be provided a microprocessor capable of guaranteeing that the content of a memory is not unjustly falsified during the execution of the program, a node terminal provided with such a microprocessor and capable of proving the execution of the program, a computer system and a program execution proving method.
    Type: Application
    Filed: July 13, 2005
    Publication date: July 20, 2006
    Inventors: Atsuya Okazaki, Masaki Nakanishi, Shigeru Yamashita, Katsumasa Watanabe