Fuse based replay protection with dynamic fuse usage and countermeasures for fuse voltage cut attacks

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 11776646
APP PUB NO 20220336033A1
SERIAL NO

17655447

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Abstract

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A TPM with programmable fuses in an SOC includes an on-die RAM storing a blown-fuse count and a TPM state read from off-die NV memory. During initialization, if the blown-fuse count is greater than a TPM state fuse count, a TPM state PIN-attempt-failure count is incremented, thereby thwarting a replay attack. If a PIN satisfies a PIN failure policy, and if a TPM state previously-passed-PIN indicator is set to true, a fuse is blown and the blown-fuse count incremented depending on the PIN being incorrect, but if the TPM state previously-passed-PIN indicator is set to false, a fuse is blown and the blown-fuse count incremented independent of whether the PIN is correct or incorrect. The TPM state fuse count is set equal to the blown-fuse count. If a counter cleared before processing the PIN remains cleared during the next initialization, a fuse voltage cut is detected and a penalty imposed.

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Patent Owner(s)

  • MICROSOFT TECHNOLOGY LICENSING, LLC.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Chen, Ling Tony Bellevue, US 85 2411
Choudhary, Ankur Redmond, US 8 10
Domke, Felix Lübeck, DE 9 44
Litterell, Bradley Joseph Bellevue, US 6 8

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