Liveness guarantees in secure enclaves using health tickets

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 12067111
APP PUB NO 20230177148A1
SERIAL NO

17545716

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Importance

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Abstract

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A health ticket minting process operates in a secure enclave on a computing device to ensure liveness of the enclave should a maliciously-compromised operating system deny service to starve the enclave. Cryptographically-secured health tickets provided by the minting process reset an authenticated watchdog timer (AWDT) that reboots the device from a hardware-protected recovery operating system if the timer expires. The health tickets are written to a secure channel using a symmetric key that is provisioned by repurposing an existing Intel SGX (Software Guard Extension) Versioning Support protocol that enables migration of secrets between enclaves that have the same author. In the event that the enclave fails to make forward progress and health tickets are not minted, then the AWDT expires and forces the reboot and re-imaging to a known good state to evict the malware from the computing device.

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Patent Owner(s)

Patent OwnerAddress
MICROSOFT TECHNOLOGY LICENSING LLCONE MICROSOFT WAY REDMOND WA 98052

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Cox, Landon Prentice Seattle, US 12 20
Gandhi, Varun Boston, US 2 0
Saroiu, Stefan Redmond, US 45 1461
Wolman, Alastair Seattle, US 101 4055

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