Pseudonymisation is a procedure by which the most identifying fields within a data record are replaced by one or more artificial identifiers.

At the point of workforce data upload, the tool automatically applies a one way hash to the unique identifier. This means that WRaPT users can no longer link the unique identifier back to the original data. Where assignment numbers are not used as unique identifiers, it is important for the uploading organisation to keep a record of the key (to map back unique ID to employee record) to ensure subject access requests can be responded to.