Configure size of encrypted password history

ComputerIntune-readyLAPS_ADEncryptedPasswordHistorySize

Supported on At least Microsoft Windows 10 or later

25H2 · 1.0

What it does

Use this setting to configure how many previous encrypted passwords will be stored in Active Directory. Configuring this setting has no effect unless 1) the password has been configured to be backed up to Active Directory and 2) password encryption has been enabled. If this setting is enabled, the specified number of older passwords will be stored in Active Directory. If this setting is disabled or not configured, zero older passwords will be stored in Active Directory. This setting has a minimum allowed value of 0 passwords. This setting has a maximum allowed value of 12 passwords. See https://go.microsoft.com/fwlink/?linkid=2188435 for more information.

What it writes

Hive: HKEY_LOCAL_MACHINE
Registry key: SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\LAPS

In Intune

No native CSP; import the ADMX (Intune-ready).

From Microsoft's Policy CSP DDF files (DDF v2 Files, February 2026), read 18 Oct 2026.

Options

Option	Type	Registry value	Allowed values
Encrypted password history sizeDefault: 0	Number	`ADEncryptedPasswordHistorySize`	0 to 12

Configure and deploy

Choose a state and the option values; the output below is generated from the template for exactly that.

Enabled · Computer · template defaults

Registry file (.reg)

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\LAPS]
"ADEncryptedPasswordHistorySize"=dword:00000000

PowerShell

$ErrorActionPreference = 'Stop'

function Set-RegistryValue {
    param(
        [Parameter(Mandatory = $true)][string] $Path,
        [Parameter(Mandatory = $true)][string] $Name,
        [Parameter(Mandatory = $true)][string] $PropertyType,
        [Parameter(Mandatory = $true)][object] $Value
    )

    if (-not (Test-Path -LiteralPath $Path)) {
        New-Item -Path $Path -Force | Out-Null
    }

    New-ItemProperty -LiteralPath $Path -Name $Name -PropertyType $PropertyType -Value $Value -Force | Out-Null
}

function Remove-RegistryValue {
    param(
        [Parameter(Mandatory = $true)][string] $Path,
        [Parameter(Mandatory = $true)][string] $Name
    )

    if (Test-Path -LiteralPath $Path) {
        Remove-ItemProperty -LiteralPath $Path -Name $Name -Force -ErrorAction SilentlyContinue
    }
}

function Clear-RegistryKeyValues {
    param(
        [Parameter(Mandatory = $true)][string] $Path
    )

    if (-not (Test-Path -LiteralPath $Path)) {
        return
    }

    foreach ($propertyName in (Get-Item -LiteralPath $Path).Property) {
        Remove-ItemProperty -LiteralPath $Path -Name $propertyName -Force -ErrorAction SilentlyContinue
    }
}

# Policy: Configure size of encrypted password history
# Name: LAPS_ADEncryptedPasswordHistorySize
# Scope: Machine
# State: Enabled
# Source: LAPS.admx

Set-RegistryValue -Path 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\LAPS' -Name 'ADEncryptedPasswordHistorySize' -PropertyType 'DWord' -Value 0

The OMA-URI is an inferred ADMX-backed Policy CSP candidate derived from the source ADMX file name and policy name.
Some Microsoft policies use built-in Policy CSP pages whose area names don't match the ADMX file name, so verify the candidate against Microsoft Learn before deployment.

ADMX profile candidate (OMA-URI)

./Device/Vendor/MSFT/Policy/Config/ADMX_LAPS/LAPS_ADEncryptedPasswordHistorySize

ADMX SyncML candidate

<SyncML xmlns="SYNCML:SYNCML1.2">
  <SyncBody>
    <Replace>
      <CmdID>1</CmdID>
      <Item>
        <Meta>
          <Format>chr</Format>
          <Type>text/plain</Type>
        </Meta>
        <Target>
          <LocURI>./Device/Vendor/MSFT/Policy/Config/ADMX_LAPS/LAPS_ADEncryptedPasswordHistorySize</LocURI>
        </Target>
        <Data>&lt;enabled/&gt;
&lt;data id="LAPS_ADEncryptedPasswordHistorySize_INT" value="0"/&gt;</Data>
      </Item>
    </Replace>
    <Final/>
  </SyncBody>
</SyncML>

Intune remediation scripts

Detection

$ErrorActionPreference = 'Stop'
$reasons = [System.Collections.Generic.List[string]]::new()

function Test-RegistryValueExists {
    param(
        [Parameter(Mandatory = $true)][string] $Path,
        [Parameter(Mandatory = $true)][string] $Name
    )

    if (-not (Test-Path -LiteralPath $Path)) {
        return $false
    }

    return $null -ne (Get-ItemProperty -LiteralPath $Path -Name $Name -ErrorAction SilentlyContinue)
}

function Test-RegistryValueEquals {
    param(
        [Parameter(Mandatory = $true)][string] $Path,
        [Parameter(Mandatory = $true)][string] $Name,
        [Parameter(Mandatory = $true)][string] $Kind,
        [Parameter(Mandatory = $true)][object] $Expected
    )

    if (-not (Test-Path -LiteralPath $Path)) {
        return $false
    }

    $valueObject = Get-ItemProperty -LiteralPath $Path -Name $Name -ErrorAction SilentlyContinue
    if ($null -eq $valueObject) {
        return $false
    }

    $actual = $valueObject.$Name
    switch ($Kind) {
        'String' { return [string]$actual -ceq [string]$Expected }
        'ExpandString' { return [string]$actual -ceq [string]$Expected }
        'DWord' { return [uint32]$actual -eq [uint32]$Expected }
        'QWord' { return [uint64]$actual -eq [uint64]$Expected }
        'MultiString' {
            $actualArray = @($actual)
            $expectedArray = @($Expected)
            if ($actualArray.Count -ne $expectedArray.Count) { return $false }
            for ($index = 0; $index -lt $actualArray.Count; $index++) {
                if ([string]$actualArray[$index] -cne [string]$expectedArray[$index]) { return $false }
            }
            return $true
        }
        'Binary' {
            $actualArray = [byte[]]$actual
            $expectedArray = [byte[]]$Expected
            if ($actualArray.Length -ne $expectedArray.Length) { return $false }
            for ($index = 0; $index -lt $actualArray.Length; $index++) {
                if ($actualArray[$index] -ne $expectedArray[$index]) { return $false }
            }
            return $true
        }
        default { return [string]$actual -ceq [string]$Expected }
    }
}

# Policy: Configure size of encrypted password history
# Name: LAPS_ADEncryptedPasswordHistorySize
# Scope: Machine
# State: Enabled
# Source: LAPS.admx

$isMatch = Test-RegistryValueEquals -Path 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\LAPS' -Name 'ADEncryptedPasswordHistorySize' -Kind 'DWord' -Expected 0
if (-not $isMatch) {
    $reasons.Add('Value mismatch: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\LAPS\ADEncryptedPasswordHistorySize') | Out-Null
}

if ($reasons.Count -eq 0) {
    Write-Output 'Compliant'
    exit 0
}

$reasons | ForEach-Object { Write-Output $_ }
exit 1

Remediation

$ErrorActionPreference = 'Stop'

function Set-RegistryValue {
    param(
        [Parameter(Mandatory = $true)][string] $Path,
        [Parameter(Mandatory = $true)][string] $Name,
        [Parameter(Mandatory = $true)][string] $PropertyType,
        [Parameter(Mandatory = $true)][object] $Value
    )

    if (-not (Test-Path -LiteralPath $Path)) {
        New-Item -Path $Path -Force | Out-Null
    }

    New-ItemProperty -LiteralPath $Path -Name $Name -PropertyType $PropertyType -Value $Value -Force | Out-Null
}

function Remove-RegistryValue {
    param(
        [Parameter(Mandatory = $true)][string] $Path,
        [Parameter(Mandatory = $true)][string] $Name
    )

    if (Test-Path -LiteralPath $Path) {
        Remove-ItemProperty -LiteralPath $Path -Name $Name -Force -ErrorAction SilentlyContinue
    }
}

function Clear-RegistryKeyValues {
    param(
        [Parameter(Mandatory = $true)][string] $Path
    )

    if (-not (Test-Path -LiteralPath $Path)) {
        return
    }

    foreach ($propertyName in (Get-Item -LiteralPath $Path).Property) {
        Remove-ItemProperty -LiteralPath $Path -Name $propertyName -Force -ErrorAction SilentlyContinue
    }
}

# Policy: Configure size of encrypted password history
# Name: LAPS_ADEncryptedPasswordHistorySize
# Scope: Machine
# State: Enabled
# Source: LAPS.admx

Set-RegistryValue -Path 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\LAPS' -Name 'ADEncryptedPasswordHistorySize' -PropertyType 'DWord' -Value 0

History 5 retained releases

24H2 · 1.030 Sep 2024
- Translations changed; choose a language above to compare its wording.
23H2 · 1.015 Jul 2024
- Template definition changed; registry values, options and limits are the same.
22H2 · 3.015 Jul 2024
- Added in this release.

1 later release left it unchanged.

Template

Internal name: LAPS_ADEncryptedPasswordHistorySize
Namespace: Microsoft.Policies.LAPS
Template file: LAPS.admx
Release: Windows 11 25H2 · 1.0 · file set de4e49983ebd651f…

Definition, editor controls and support

Definition

<policy class="Machine" displayName="$(string.LAPS_ADEncryptedPasswordHistorySize)" explainText="$(string.LAPS_ADEncryptedPasswordHistorySize_Help)" key="SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\LAPS" name="LAPS_ADEncryptedPasswordHistorySize" presentation="$(presentation.LAPS_ADEncryptedPasswordHistorySize)" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions">
      <parentCategory ref="Microsoft.Policies.LAPS:LAPS_CAT" />
      <supportedOn ref="Microsoft.Policies.LAPS:SUPPORTED_Windows10" />
      <elements>
        <decimal id="LAPS_ADEncryptedPasswordHistorySize_INT" maxValue="12" minValue="0" valueName="ADEncryptedPasswordHistorySize" />
      </elements>
    </policy>

Editor controls

<presentation id="LAPS_ADEncryptedPasswordHistorySize" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions">
        <decimalTextBox defaultValue="0" refId="LAPS_ADEncryptedPasswordHistorySize_INT">Encrypted password history size</decimalTextBox>
      </presentation>

Supported platforms and category

Microsoft.Policies.LAPS:category:LAPS_CAT
<category displayName="$(string.LAPS)" name="LAPS_CAT" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions">
      <parentCategory ref="Microsoft.Policies.Windows:System" />
    </category>
Microsoft.Policies.LAPS:definition:SUPPORTED_Windows10
<definition displayName="$(string.SUPPORTED_Windows10)" name="SUPPORTED_Windows10" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions" />
Microsoft.Policies.Windows:category:System
<category displayName="$(string.System)" explainText="$(string.System_Help)" name="System" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions" />
Microsoft.Policies.LAPS:category:LAPS_CAT
<category displayName="$(string.LAPS)" name="LAPS_CAT" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions">
      <parentCategory ref="Microsoft.Policies.Windows:System" />
    </category>
<strings><string id="Microsoft.Policies.LAPS:LAPS">LAPS</string></strings>
Microsoft.Policies.LAPS:definition:SUPPORTED_Windows10
<definition displayName="$(string.SUPPORTED_Windows10)" name="SUPPORTED_Windows10" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions" />
<strings><string id="Microsoft.Policies.LAPS:SUPPORTED_Windows10">At least Microsoft Windows 10 or later</string></strings>
Microsoft.Policies.Windows:category:System
<category displayName="$(string.System)" explainText="$(string.System_Help)" name="System" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions" />
<strings><string id="Microsoft.Policies.Windows:System">System</string><string id="Microsoft.Policies.Windows:System_Help">Allows configuration of various system component settings.</string></strings>