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I wonder how stable a machineGUID is. Can a user change it? If so how and what would happen to there Windows auth key?

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It can be found here:

HKLM\Software\Microsoft\Cryptography\MachineGuid

You need admin permissions to change it.

Here's some C# code to do it:

var machineGuid = Registry.LocalMachine; 
machineGuid = machineGuid.OpenSubKey(@"SOFTWARE\Microsoft\Cryptography", RegistryKeyPermissionCheck.ReadWriteSubTree, RegistryRights.FullControl); 

No idea if it will change the windows auth key.

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