But in 2012 , election-security advocates are most worried about the bits and bytes of data stored on the electronic voting machines that millions of Americans will use to cast their ballot . Experts say election security in the US is improving , but there 's little to do . About 45 million Americans will cast an electronic ballot with no paper trail . ` ` High - school level '' coding skills are all that 's needed to hack a machine . Election officials are going back to paper ballots , but money is a concern .
Experts say election security in the US is improving , but there 's little to do . About 45 million Americans will cast an electronic ballot with no paper trail . ` ` High - school level '' coding skills are all that 's needed to hack a machine . Election officials are going back to paper ballots , but money is a concern .