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3 forms found in the DOM

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Name: site-header-search-form — GET /en-us/search/

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javascript:

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SYSKEY.EXE UTILITY IS NO LONGER SUPPORTED IN WINDOWS 10, WINDOWS SERVER 2016,
AND LATER VERSIONS

 * Article
 * 02/19/2024
 * 2 contributors

Feedback


IN THIS ARTICLE

    
 1. Changes detail
    
 2. Workaround
    
 3. More information
    
 4. Reference
    

Windows 10, version 1709, Windows Server, version 2004 and later versions of
Windows no longer support the syskey.exe utility.

Applies to:   Windows 10 - all editions, Windows Server 2019, Windows Server
2016
Original KB number:   4025993


CHANGES DETAIL

The following changes are made:

 * The syskey.exe utility is no longer included in Windows.
 * Windows will never prompt for a syskey password during startup.
 * Windows will no longer support installing an Active Directory domain
   controller by using Install-From-Media (IFM) that was externally encrypted by
   the syskey.exe utility.

If an operating system (OS) was externally encrypted by the syskey.exe utility,
you can't upgrade it to Windows 10 version 1709, Windows Server version 2004, or
a later version of Windows.


WORKAROUND

If you want to use boot-time OS security, we recommend that you use BitLocker or
similar technologies instead of the syskey.exe utility.

If you use Active Directory IFM media to install replica Active Directory domain
controllers, we recommend that you use BitLocker or other file encryption
utilities to protect all IFM media.

To upgrade an OS that's externally encrypted by the syskey.exe utility to
Windows 10 RS3 or Windows Server 2016 RS3, the OS should be configured not to
use an external syskey password. For more information, see step 5 in How to use
the SysKey utility to secure the Windows Security Accounts Manager database.


MORE INFORMATION

Syskey is a Windows internal root encryption key that's used to encrypt other
sensitive OS state data, such as user account password hashes. The SysKey
utility can be used to add an extra layer of protection, by encrypting the
syskey to use an external password. In this state, the OS blocks the boot
process and prompt users for the password (either interactively or by reading
from a floppy disk).

Unfortunately, the syskey encryption key and the use of syskey.exe are no longer
considered secure. Syskey is based on weak cryptography that can easily be
broken in modern times. The data that's protected by syskey is limited and
doesn't cover all files or data on the OS volume. The syskey.exe utility has
also been known to be used by hackers as part of ransomware scams.

Active Directory previously supported the use of an externally encrypted syskey
for IFM media. When a domain controller is installed by using IFM media, the
external syskey password had to be provided as well. Unfortunately, this
protection suffers from the same security flaws.


REFERENCE

The syskey.exe utility and its underlying support in the Windows OS was first
introduced in Windows 2000 and backported to Windows NT 4.0. For more
information, see How to use the SysKey utility to help secure the Windows
Security Accounts Manager database.





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Training

Module

Explore advanced protection methods - Training

This module explores additional tools used to provide additional layers of
security within an organization.




IN THIS ARTICLE



English (United States)
California Consumer Privacy Act (CCPA) Opt-Out Icon Your Privacy Choices
Theme
 * Light
 * Dark
 * High contrast

 * 
 * Previous Versions
 * Blog
 * Contribute
 * Privacy
 * Terms of Use
 * Trademarks
 * © Microsoft 2024