System and method for authenticating an operating system to a central processing unit, providing the CPU/OS with secure storage, and authenticating the CPU/OS to a third party
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United States of America Patent
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Feb 6, 2007
Grant Date -
N/A
app pub date -
Mar 10, 1999
filing date -
Mar 10, 1999
priority date (Note) -
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Abstract
A general-purpose processor (CPU) is configured with a new mechanism facilitating an authenticated boot sequence that provides building blocks for client-side rights management when the system is online, and provides continued protection of persistent data even when the system goes offline or is rebooted. The CPU includes a cryptographic key pair, and a manufacturer certificate testifying that the manufacturer built the CPU according to a known specification. The operating system (OS) includes a unique block of code, or 'boot block' that can establish OS identity by extraction from a digitally signed boot block or by computing a hash digest of the boot block. During booting, the CPU executes a single opcode, followed by the boot block, as an atomic operation to set the identity of the OS into the software identity register. The subscriber unit then can establish a chain of trust to a content provider.
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