Barcode Voting Machines: The Most Unnecessary Gap in US Election Security | Elise Kline/WhoWhatWhy
Election technology experts are warning that barcode ballot marking devices (BMDs) are vulnerable to bad actors capable of committing the perfect crime: changing the information on a ballot and getting away with it without the voter even realizing it happened. The use of barcodes is one of these machines’ biggest downsides. When people vote with these BMDs, they fill out their ballot on a screen; a printer then produces a paper ballot marked with a barcode. To cast their ballot, users feed this paper into a third device that scans the barcode to record the vote. And that’s a problem. “Voters can’t read barcodes,” said Alex Halderman, professor of computer science and director of the Center for Computer Security and Society at the University of Michigan. “The problem is that you’re putting a potentially compromised computer in between the voter and the permanent and only record of their ballot.” Their susceptibility to these types of attacks is not the only problem; BMDs are also difficult to adequately test and audit, according to a 2022 research report from the University of California, Berkeley. The report demonstrates that even a small percentage of votes changed in a cybersecurity attack can alter the overall margin of results. It found that changing the votes on just 1 percent of ballots in a jurisdiction can alter the margin of a contest jurisdiction-wide by 2 percent, even if there are no undervotes or invalid votes.
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