Patents by Inventor Jon Lange

Jon Lange 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).

  • Use of hashing in a secure boot loader
    Patent number: 7676840
    Abstract: Machine instructions comprising a bootstrap code are buried within a critical component of an electronic game console where they cannot readily be accessed or modified. A preloader portion in a read only memory (ROM) is hashed by the bootstrap code and the result is compared to an expected hash value maintained in the bootstrap code. Further verification of the boot-up process is carried out by the preloader, which hashes the code in ROM to obtain a hash value for the code. The result is verified against a digital signature value that defines an expected value for this hash. Failure to obtain any expected result terminates the boot-up process. Since the bootstrap code confirms the preloader, and the preloader confirms the remainder of the code in ROM, this technique is useful for ensuring that the code used for booting up the device has not been modified or replaced.
    Type: Grant
    Filed: January 7, 2005
    Date of Patent: March 9, 2010
    Assignee: Microsoft Corporation
    Inventors: Dinarte Morais, Jon Lange, Daniel R. Simon, Ling Tony Chen, Josh D. Benaloh
  • Use of hashing in a secure boot loader
    Publication number: 20050138270
    Abstract: Machine instructions comprising a bootstrap code are buried within a critical component of an electronic game console where they cannot readily be accessed or modified. A preloader portion in a read only memory (ROM) is hashed by the bootstrap code and the result is compared to an expected hash value maintained in the bootstrap code. Further verification of the boot-up process is carried out by the preloader, which hashes the code in ROM to obtain a hash value for the code. The result is verified against a digital signature value that defines an expected value for this hash. Failure to obtain any expected result terminates the boot-up process. Since the bootstrap code confirms the preloader, and the preloader confirms the remainder of the code in ROM, this technique is useful for ensuring that the code used for booting up the device has not been modified or replaced.
    Type: Application
    Filed: January 7, 2005
    Publication date: June 23, 2005
    Applicant: Microsoft Corporation
    Inventors: Dinarte Morais, Jon Lange, Daniel Simon, Ling Chen, Josh Benaloh
  • Use of hashing in a secure boot loader
    Patent number: 6907522
    Abstract: Machine instructions comprising a bootstrap code are buried within a critical component of an electronic game console where they cannot readily be accessed or modified. A preloader portion in a read only memory (ROM) is hashed by the bootstrap code and the result is compared to an expected hash value maintained in the bootstrap code. Further verification of the boot-up process is carried out by the preloader, which hashes the code in ROM to obtain a hash value for the code. The result is verified against a digital signature value that defines an expected value for this hash. Failure to obtain any expected result terminates the boot-up process. Since the bootstrap code confirms the preloader, and the preloader confirms the remainder of the code in ROM, this technique is useful for ensuring that the code used for booting up the device has not been modified or replaced.
    Type: Grant
    Filed: June 7, 2002
    Date of Patent: June 14, 2005
    Assignee: Microsoft Corporation
    Inventors: Dinarte Morais, Jon Lange, Daniel R. Simon, Ling Tony Chen, Josh D. Benaloh
  • Use of hashing in a secure boot loader
    Publication number: 20030229777
    Abstract: Machine instructions comprising a bootstrap code are buried within a critical component of an electronic game console where they cannot readily be accessed or modified. A preloader portion in a read only memory (ROM) is hashed by the bootstrap code and the result is compared to an expected hash value maintained in the bootstrap code. Further verification of the boot-up process is carried out by the preloader, which hashes the code in ROM to obtain a hash value for the code. The result is verified against a digital signature value that defines an expected value for this hash. Failure to obtain any expected result terminates the boot-up process. Since the bootstrap code confirms the preloader, and the preloader confirms the remainder of the code in ROM, this technique is useful for ensuring that the code used for booting up the device has not been modified or replaced.
    Type: Application
    Filed: June 7, 2002
    Publication date: December 11, 2003
    Inventors: Dinarte Morais, Jon Lange, Daniel R. Simon, Ling Tony Chen, Josh D. Benaloh