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fTPM: A Software-only Implementation of a TPM Chip
Commodity CPU architectures, such as
ARM and Intel CPUs, have started to offer trusted computing features in their CPUs aimed at displacing dedicated trusted hardware. Unfortunately, these CPU architectures raise serious challenges to building trusted systems because they omit providing secure resources outside the CPU perimeter.
This paper shows how to overcome these challenges
to build software systems with security guarantees similar to those of dedicated trusted hardware. We present
the design and implementation of a firmware-based TPM
2.0 (fTPM) leveraging ARM TrustZone. Our fTPM is the
reference implementation of a TPM 2.0 used in millions
of mobile devices. We also describe a set of mechanisms
needed for the fTPM that can be useful for building more
sophisticated trusted applications beyond just a TPM.
ARM and Intel CPUs, have started to offer trusted computing features in their CPUs aimed at displacing dedicated trusted hardware. Unfortunately, these CPU architectures raise serious challenges to building trusted systems because they omit providing secure resources outside the CPU perimeter.
This paper shows how to overcome these challenges
to build software systems with security guarantees similar to those of dedicated trusted hardware. We present
the design and implementation of a firmware-based TPM
2.0 (fTPM) leveraging ARM TrustZone. Our fTPM is the
reference implementation of a TPM 2.0 used in millions
of mobile devices. We also describe a set of mechanisms
needed for the fTPM that can be useful for building more
sophisticated trusted applications beyond just a TPM.
16 pages, ebook
Published June 1, 2018
1 person want to read
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