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Clarify what locked down means and orogin of the UDS in Bellatrix

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Signed-off-by: Joachim Strömbergson <joachim@assured.se>
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Joachim Strömbergson 2023-05-02 14:08:00 +02:00 committed by dehanj
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doc/threat_model/threat_model.md
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@ -176,9 +176,13 @@ are out of scope and what mitigations are in place.
### TK1-23.03.1-Bellatrix
This is the first general release of the TKey TK1 device. In this
device the FPGA bitstream is stored and locked into the NVCM. The UDS
and UDI assets are stored as part of the FPGA bitstream.
This is the first general release of the TKey TK1 end user device. In this
device the FPGA bitstream is stored and locked into the NVCM. This means
that the bitstream can't be changed or read out from the device.
The UDS and UDI assets are generated during provisioning by Tillitis, and
are stored as part of the FPGA bitstream. The UDS is generated using
the tpt tool and is not stored by Tillitis after generation.
The FPGA design contain some mechanisms for execution protection,
execution monitoring as well as functionality designed to make warm