Policy

Configure the system to use legacy Dictionary Attack Prevention Parameters setting for TPM 2.0.

Windows 11 25H2

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Policy overview

Key metadata and intent for this policy.

ClassComputer
CategorySystem > Trusted Platform Module Services
Supported onAt least Windows Server 2016, Windows 10 Version 1703

Supported OS tags: Windows10, Windows10RT, Windows11, WindowsServer2016

This policy setting configures the TPM to use the Dictionary Attack Prevention Parameters (lockout threshold and recovery time) to the values that were used for Windows 10 Version 1607 and below. Setting this policy will take effect only if a) the TPM was originally prepared using a version of Windows after Windows 10 Version 1607 and b) the System has a TPM 2.0. Note that enabling this policy will only take effect after the TPM maintenance task runs (which typically happens after a system restart). Once this policy has been enabled on a system and has taken effect (after a system restart), disabling it will have no impact and the system's TPM will remain configured using the legacy Dictionary Attack Prevention parameters, regardless of the value of this group policy. The only way for the disabled setting of this policy to take effect on a system where it was once enabled is to a) disable it from group policy and b)clear the TPM on the system.

Internal name
UseLegacyDAP_Name
Policy ID
36bd88521f53
Elements
0

Registry values

How enabled and disabled states update the registry.

Registry locationTypeEnabled valueDisabled value
HKLM\Software\Policies\Microsoft\TPM\UseLegacyDictionaryAttackParametersREG_DWORD
1
0

Policy elements

Inputs and configuration options exposed by this policy.

This policy has no additional user input fields.

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