Electronic Voting : 6th International Joint Conference, e-Vote-ID 2021, Virtual Event, October 5-8, 2021, Proceedings - Krimmer, Robert; Duenas-Cid, David; Germann, Micha; Kulyk, Oksana; Rønne, Peter; Solvak, Mihkel; Volkamer, Melanie (Springer International Publishing, 2021)