Information Technology Security Guidance for Practitioners ITSP.30.031 V3 supersedes ITSP.30.031 V2 User Authentication Guidance for IT Systems and provides guidance on user authentication in IT systems. ITSP.30.031 V3 is also part of a suite of documents developed by CSE to help secure GC departmental networks. User authentication is imperative in keeping cyber threat actors out of departmental systems, and the security controls used to protect GC systems are critical elements in the design of IT infrastructure.