The communication channel between the main processor and the TPM is the easiest point of attack. The Chip Whisperer has been able to do this for years. Once someone gets their hands on the hardware, all bets are off.
Don't see how this is new?
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What a non-issue. From Microsoft's immutable laws of security, written decades ago:
Law #3: If a bad actor has unrestricted physical access to your computer, it's not your computer anymore.
The classic example was an attacker can simply take a baseball bat to your system if they have physical access
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