Molly Hall, a spokeswoman for the DEFCON event, said the mock websites were built by Brian Markus, who she called a “world-renowned security expert.” In total, 35 of 39 participants ages 6-17 successfully hacked mock versions of Secretary of State websites in six swing states during a portion of the convention called the Voting Machine Hacking Village, according to event organizers. The “hackers” managed to tamper with vote tallies, party names and candidate names, changing vote tallies to numbers like 12 billion and candidate names to “Bob Da Builder” and “Richard Nixon’s head.”