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Merge pull request #10166 from RAJU2529/patch-232

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changed the value from 4 to 5
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Denise Vangel-MSFT 2021-11-30 08:43:51 -08:00 committed by GitHub
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windows/security/information-protection/tpm/change-the-tpm-owner-password.md
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@ -13,7 +13,7 @@ manager: dansimp
audience: ITPro
ms.collection: M365-security-compliance
ms.topic: conceptual
ms.date: 09/03/2021
ms.date: 11/30/2021
---
# Change the TPM owner password
@ -30,7 +30,7 @@ This topic for the IT professional describes how to change the password or PIN f
Starting with Windows 10, version 1607, or Windows 11, Windows will not retain the TPM owner password when provisioning the TPM. The password will be set to a random high entropy value and then discarded.
> [!IMPORTANT]
> Although the TPM owner password is not retained starting with Windows 10, version 1607, or Windows 11, you can change a default registry key to retain it. However, we strongly recommend that you do not make this change. To retain the TPM owner password, set the registry key 'HKLM\\Software\\Policies\\Microsoft\\TPM' \[REG\_DWORD\] 'OSManagedAuthLevel' to 4. The default value for this key is 2, and unless it is changed to 4 before the TPM is provisioned, the owner password will not be saved.
> Although the TPM owner password is not retained starting with Windows 10, version 1607, or Windows 11, you can change a default registry key to retain it. However, we strongly recommend that you do not make this change. To retain the TPM owner password, set the registry key 'HKLM\\Software\\Policies\\Microsoft\\TPM' \[REG\_DWORD\] 'OSManagedAuthLevel' to 4. The default value for this key is 5, and unless it is changed to 4 before the TPM is provisioned, the owner password will not be saved.
Only one owner password exists for each TPM. The TPM owner password allows the ability to enable, disable, or clear the TPM without having physical access to the computer, for example, by using the command-line tools remotely. The TPM owner password also allows manipulation of the TPM dictionary attack logic. Taking ownership of the TPM is performed by Windows as part of the provisioning process on each boot. Ownership can change when you share the password or clear your ownership of the TPM so someone else can initialize it.