Notwithstanding the success of some trials, the use of the internet for casting votes has raised several security concerns. “Estonia was the first country in the world to use internet voting nationally, and today more than 30% of its ballots are cast online”, but researchers from the University of Michigan and the Open Rights Group have found “that the [Estonian] I-voting system has serious architectural limitations and procedural gaps that potentially jeopardise the integrity of elections” to the extent that “attackers could target the election servers or voters’ clients to alter election results or undermine the legitimacy of the system.” Their concerns were such that they concluded that “[s]omeday, if there are fundamental advances in computer security, the risk profile may be more favorable for internet voting, but we do not believe that the I-voting system can be made safe today”.