Linköping University. Welcome to Linköping university Central Authentication Service. Enter your LiU-ID and Password. Search LiU.se Find an employee Find a location. You have requested a web-page that requires you to login. Please supply your LiU-ID (e.g. andan123, boek12) and your password. For security reasons, please Log Out and Exit your web browser when you are done accessing services that require authentication!