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https://github.com/MicrosoftDocs/windows-itpro-docs/issues/3012
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windows/security/information-protection/tpm/switch-pcr-banks-on-tpm-2-0-devices.md
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@ -50,6 +50,22 @@ As a result, if the currently used PCR bank is switched all keys that have been
Before switching PCR banks you should suspend or disable BitLocker – or have your recovery key ready. For steps on how to switch PCR banks on your PC, you should contact your OEM or UEFI vendor. Before switching PCR banks you should suspend or disable BitLocker – or have your recovery key ready. For steps on how to switch PCR banks on your PC, you should contact your OEM or UEFI vendor.
## How can I identify which PCR bank is being used?
You can identify which PCR bank is currently used by Windows by looking at the registry.
Registry key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\IntegrityServices
DWORD: TPMActivePCRBanks
Defines which PCR banks are currently active.
Registry key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\IntegrityServices
DWORD: TPMDigestAlgID
Algorithm ID of the PCR bank that Windows is currently using.
## Related topics ## Related topics
- [Trusted Platform Module](trusted-platform-module-top-node.md) (list of topics) - [Trusted Platform Module](trusted-platform-module-top-node.md) (list of topics)