Privacy and Identity Management. Between Data Protection and Security : 16th IFIP WG 9. 2, 9. 6/11. 7, 11. 6/SIG 9. 2. 2 International Summer School, Privacy and Identity 2021, Virtual Event, August 16-20, 2021, Revised Selected Papers - Friedewald, Michael. (Springer International Publishing AG, 2022)