Can these touch-screen voters in Florida, 2004, be sure what happened next? (Image: Mario Tama/Getty Images)
It is election day. You step into the polling booth and place a mark against your chosen candidate on the ballot form. You then take your ballot to a machine that scans the paper and displays it on-screen for you to confirm. It appears as if everything has gone smoothly, but how can you be sure the computer has awarded your vote to the right candidate?
When US voters go to the polls for mid-term elections on 7 November, the vast majority will rely…
