Powershell: add an hash column / GUID to a csv based on three other columns

Hello, I need a Powershell script that transform a CSV file by adding a hash column / GUID based on three other columns identified by their headers. In more details, the original csv file has among other columns : activedirectory_account, position, department The output file should have: activedirectory_account, position, department guid - if any of the three original listed columns change, the guid should be different. - if all three columns are the same, the guid should be the same at each execution of the anonymisation script - the chance to produce the same hash with different combination should be almost null. The structure of the hash should be consistent, it can be a GUID but other forms are accepted. Thanks for your offer.