Already Windows 8.0 introduced a new possibility of evaluating the health of the boot process called Measured Boot, a recorded variant of the Secure Boot. But the suitable enterprise counter part for checking the health data and enforcing access control was not available at that time.
With Windows 10 1511 the technique was named as Windows Provable PC Health (PPCH) and later on with Windows 1607 and newer renamed to DHA. On Windows Server 2016 the counterpart is named Health Attestation Service (HAS).
But what does DHA exactly? It will combine Secure Boot, VBS, ELAM, and protection of your early-boot drivers and measures them with the help of your TPM 2.0. These measured boot data results are collected by the health attestation configuration service provider (CSP) and sent to a Remote HAS for verification/comparison against current policies:
The health...
