A series of new reports have again raised questions about the security of electronic voting machines, with one report identifying multiple vulnerabilities.

The Brennan Centre for Justice at New York University School of Law, in a report said three popular electronic voting systems are vulnerable to software attacks that could threaten the integrity of elections. The centre's Task Force on Voting System Security, made up of computer security experts from the U.S. government, universities and the private sector, unanimously recommended states conduct routine audits comparing voter-verified paper trails to the electronic record. The task force also recommended a ban on wireless components in voting machines. Michael Waldman, the Brennan Centre's executive director, said in a statement that these machines are vulnerable to attack. The report details nine categories of possible attacks on e-Voting machines, including attacks on tally servers and attacks designed to shut down e-Voting machines. While supporters of e-voting vendors say there's no evidence of software-based attacks on e-voting machines, the report suggests such attacks should be expected because in the last several years, there have been increasingly sophisticated attacks on nonvoting computer systems. The Information Technology Association of America  (ITAA), a trade group representing e-Voting vendors, questioned the report, saying it was based on speculation, not performance.