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Set-BitLockerPIN.ps1

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+# Variables
+$Target = "$env:ProgramData\Scripts"
+$Script = "BitPin.ps1"
+
+# If local path for script doesn't exist, create it
+If (!(Test-Path $Target)) { New-Item -Path $Target -Type Directory -Force }
+
+#Create the PS1 File and write the code into it
+Set-Content -Path "$Target\$Script" -Force -Value @'
+do{
+$proc = Get-Process -Name SecurityHealthSystray -ErrorAction SilentlyContinue
+    if ($proc)
+    {
+        $OSVolume = Get-BitlockerVolume | Where {$_.VolumeType -eq "OperatingSystem"}
+        Initialize-Tpm -AllowClear
+        $DevicePIN = ConvertTo-SecureString ([System.Text.Encoding]::UTF8.GetString([Convert]::FromBase64String("MDAwMA=="))) -AsPlainText -Force
+        Add-BitlockerKeyProtector -MountPoint $OSVolume.MountPoint -RecoveryPasswordProtector
+        Enable-BitLocker -MountPoint $OSVolume.MountPoint -UsedSpaceOnly -Pin $DevicePIN -TPMandPinProtector
+        $RecoveryKeyID = ((Get-BitlockerVolume).KeyProtector | Where {$_.KeyProtectorType -eq "RecoveryPassword"}).KeyProtectorId
+
+        Unregister-ScheduledTask -TaskName "BitPinSet" -Confirm:$False
+
+        # Remove this script after execution
+        Remove-Item -Path $MyInvocation.MyCommand.Source -Force
+
+        $RestartTime = (Get-Date).AddSeconds(300).ToString("HH:mm:ss")
+        shutdown /r /t 300 /c "BitLocker PIN code has been set, Windows will restart at $RestartTime. Please save your work now."
+
+        Exit 0
+    }
+    Else {
+        Start-Sleep -s 5
+        }
+} while (1 -eq 1)
+'@
+
+# Create the scheduled task to run the script at logon
+$action = New-ScheduledTaskAction -Execute 'C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe' -Argument "-NoProfile -ExecutionPolicy Bypass -File $Target\$Script"
+$trigger =  New-ScheduledTaskTrigger -AtLogOn
+$settings = New-ScheduledTaskSettingsSet -AllowStartIfOnBatteries -DontStopIfGoingOnBatteries -Compatibility Win8
+$principal = New-ScheduledTaskPrincipal -GroupId "NT AUTHORITY\SYSTEM"
+$task = New-ScheduledTask -Action $action -Trigger $trigger -Settings $settings -Principal $principal
+
+Register-ScheduledTask -InputObject $task -TaskName "BitPinSet" -Force