Security researchers have found key flaws in a mobile voting app that some states plan to use in the 2020 election that can allow hackers to launch both client- and server-side attacks that can easily manipulate or even delete someone’s vote, as well as prevent a reliable audit from taking place after the fact, they said. A team of researchers at MIT released a security audit of Voatz—a blockchain app that already was used in a limited way for absentee-ballot voting in the 2018 mid-term elections—that they said bolsters the case for why internet voting is a bad idea and voting transparency is the only way to ensure legitimacy.

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