Harri Hursti has spent 15 years trying to draw attention to the weaknesses in America’s election systems

In 2005, a concerned Florida election supervisor asked the Finnish data-security expert Harri Hursti to hack into one of the state’s commonly used voting machines to test its vulnerability. The verdict wasn’t reassuring. By modifying just a few lines of code on the machine’s memory card, Mr. Hursti says, he could change the results of a mock election. That same model, he adds, will be among those used in the 2020 elections. (A spokesperson for the machine’s vendor, Dominion Voting, says that these weaknesses were fixed in 2012, but Mr. Hursti says that he has tested the new version and found the updates insufficient.)

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