Internet voting in EstoniaVinkel, PriitInformation security technology for applications : 16th Nordic Conference on Secure IT Systems, NordSec 2011, Tallinn, Estonia, October 26-28, 2011, Revised Selected Papers2012 / p. 4-12 : ill https://link.springer.com/chapter/10.1007/978-3-642-29615-4_2