Patents by Inventor Keiichi Ushiwaka

Keiichi Ushiwaka 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).

  • Open generic tamper resistant CPU and application system thereof
    Publication number: 20040093505
    Abstract: A central processing unit (GT) comprises a private key in secrecy, and an encryption engine. Before the GT executes software, a license added to the software is entered into the GT. The license includes information obtained by encrypting a code encryption key used when the software is encrypted with a public key pairing with the private key. When the license is entered, the encryption engine obtains the code encryption key by decrypting the license with the private key, and decrypts the software with the code encryption key.
    Type: Application
    Filed: July 9, 2003
    Publication date: May 13, 2004
    Applicant: FUJITSU LIMITED
    Inventors: Takahisa Hatakeyama, Hidefumi Maruyama, Keiichi Ushiwaka, Takayuki Hasebe, Naoaki Maeda, Atsuhiro Suga