To sign a PowerShell script, import a code signing certificate into the Windows certificate store, retrieve it with Get-ChildItem, and apply it to the script using the Set-AuthenticodeSignature cmdlet along with a timestamp server. This embeds a digital signature block at the end of the .ps1 file, which PowerShell checks against the configured execution policy before the script runs. The sections below cover certificate prerequisites, the signing commands, signature verification, and how signed scripts behave in Active Directory, standalone, and CI/CD environments. What You Need Before Signing a PowerShell Script Before signing a PowerShell script, the environment and certificate setup must already be in place. PowerShell script signing depends on things like system trust settings, where the certificate is stored, and the execution policy in Windows. So, because of that, you need to set everything correctly before signing the script. The setup part is as important as the signing command. You need a device with Windows 8.1 or any newer Windows version. PowerShell 5.1 or above should also be installed in the system. Newer versions like PowerShell 7 can also do script signing, but many office and company systems still mostly use PowerShell 5.1 because older admin scripts work properly […]