KDC support for claims, compound authentication and Kerberos armoring: registry value EnableCbacAndArmor and 1 moreComputerHKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System\KDC\Parameters

Policy ID: CbacAndArmor
Scope: Computer Configuration
Supported on: At least Windows Server 2012, Windows 8 or Windows RT
Source: Administrative Templates (.admx) for Windows 11 2026 Update (26H2) (version 1.0)
Category: System › KDC

Registry

EnableCbacAndArmor

REG_DWORDComputer

HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System\KDC\Parameters Current key

Enabled value: 1
Disabled value: 0

Apply with .reg · CMD · PowerShell

.reg

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Policies\System\KDC\Parameters]

; Options (use only one)
; Enabled
"EnableCbacAndArmor"=dword:00000001
; Disabled
"EnableCbacAndArmor"=dword:00000000

CMD

:: Options (use only one)

:: Enabled
reg add "HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System\KDC\Parameters" /v "EnableCbacAndArmor" /t REG_DWORD /d 1 /f
:: Disabled
reg add "HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System\KDC\Parameters" /v "EnableCbacAndArmor" /t REG_DWORD /d 0 /f

PowerShell

# Common: create the key
New-Item -Path 'HKLM:\Software\Microsoft\Windows\CurrentVersion\Policies\System\KDC\Parameters' -Force | Out-Null

# Options (use only one)
# Enabled
New-ItemProperty -Path 'HKLM:\Software\Microsoft\Windows\CurrentVersion\Policies\System\KDC\Parameters' -Name 'EnableCbacAndArmor' -PropertyType DWord -Value 1 -Force | Out-Null
# Disabled
New-ItemProperty -Path 'HKLM:\Software\Microsoft\Windows\CurrentVersion\Policies\System\KDC\Parameters' -Name 'EnableCbacAndArmor' -PropertyType DWord -Value 0 -Force | Out-Null

CbacAndArmorLevel

REG_DWORDComputer

HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System\KDC\Parameters Current key

Enabled value: Depends on the option value
Element: Claims, compound authentication for Dynamic Access Control and Kerberos armoring options:

Options
Item	Stored value
Not supported	0
Supported	1
Always provide claims	2
Fail unarmored authentication requests	3

Apply with .reg · CMD · PowerShell

.reg

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Policies\System\KDC\Parameters]

; Options (use only one)
; Not supported
"CbacAndArmorLevel"=dword:00000000
; Supported
"CbacAndArmorLevel"=dword:00000001
; Always provide claims
"CbacAndArmorLevel"=dword:00000002
; Fail unarmored authentication requests
"CbacAndArmorLevel"=dword:00000003

CMD

:: Options (use only one)

:: Not supported
reg add "HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System\KDC\Parameters" /v "CbacAndArmorLevel" /t REG_DWORD /d 0 /f
:: Supported
reg add "HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System\KDC\Parameters" /v "CbacAndArmorLevel" /t REG_DWORD /d 1 /f
:: Always provide claims
reg add "HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System\KDC\Parameters" /v "CbacAndArmorLevel" /t REG_DWORD /d 2 /f
:: Fail unarmored authentication requests
reg add "HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System\KDC\Parameters" /v "CbacAndArmorLevel" /t REG_DWORD /d 3 /f

PowerShell

# Common: create the key
New-Item -Path 'HKLM:\Software\Microsoft\Windows\CurrentVersion\Policies\System\KDC\Parameters' -Force | Out-Null

# Options (use only one)
# Not supported
New-ItemProperty -Path 'HKLM:\Software\Microsoft\Windows\CurrentVersion\Policies\System\KDC\Parameters' -Name 'CbacAndArmorLevel' -PropertyType DWord -Value 0 -Force | Out-Null
# Supported
New-ItemProperty -Path 'HKLM:\Software\Microsoft\Windows\CurrentVersion\Policies\System\KDC\Parameters' -Name 'CbacAndArmorLevel' -PropertyType DWord -Value 1 -Force | Out-Null
# Always provide claims
New-ItemProperty -Path 'HKLM:\Software\Microsoft\Windows\CurrentVersion\Policies\System\KDC\Parameters' -Name 'CbacAndArmorLevel' -PropertyType DWord -Value 2 -Force | Out-Null
# Fail unarmored authentication requests
New-ItemProperty -Path 'HKLM:\Software\Microsoft\Windows\CurrentVersion\Policies\System\KDC\Parameters' -Name 'CbacAndArmorLevel' -PropertyType DWord -Value 3 -Force | Out-Null