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A USB keylogger is not detectable by the computer, not in firmware nor operating system. It passively sniffs the traffic between the USB keyboard and the computer, to be dumped out later.
The signature checks will immediately fail if ANY tampering has occurred.
Adding a USB keylogger that has not been signed will cause a signature verification failure during boot.
A USB keylogger is not detectable by the computer, not in firmware nor operating system. It passively sniffs the traffic between the USB keyboard and the computer, to be dumped out later.
If your keys are stored in the TPM for use during the secure boot phase, there will be nothing for it to log.