Core engineering and protocols for Complex Authorization Policies.
Simple PCR matching causes operational headaches: whenever the operating system kernel or firmware receives a routine security patch, PCR measurements change, breaking access to sealed keys. TPMVault implements dynamic policy trees using TPM2_PolicyAuthorize, where an enterprise security authority signs authorized PCR golden baselines using FIPS 204 ML-DSA.
We detail policy trees combining multiple Boolean conditions: a disk encryption key may require that (PCR_0 matches secure boot) AND (a valid admin ML-DSA signature is presented) AND (the system has not exceeded its brute-force retry counter threshold).