An 11-year-old has been able to hack into a replica of Florida's election system in 10 minutes during a test ahead of upcoming US midterm elections this November. The boy was the fastest of 35 children who were able to hack into replicas of the websites of six swing states during the three-day Def Con security convention. The results of those efforts to test the strength of US election infrastructure will be passed onto the states, and the National Association of Secretaries of State - the officials responsible for tallying and confirming vote totals - said that they welcome the efforts. The results highlight potential security lapses amid heightened concern that American voter rolls will be tampered with in the upcoming midterm elections, and after President Donald Trump's national security team warned that Russia had launched pervasive" efforts to interfere in America's 2018 elections. The convention indicated that the hackers were able to change party names in the systems, and added as many as 12 billion votes to candidates. "Candidates names were changed to 'Bob Da Builder' and 'Richard Nixon's head'," the convention said in a tweet. The winning hacker was identified as Emmett Brewer, a boy whose Twitter account says he lives in Austin, Texas.