AP:

Republican efforts questioning the outcome of the 2020 presidential race have led to voting system breaches that election security experts say pose a heightened risk to future elections.

Copies of the Dominion Voting Systems software used to manage elections — from designing ballots to configuring voting machines and tallying results — were distributed at an event this month in South Dakota organized by MyPillow CEO Mike Lindell, an ally of former President Donald Trump who has made unsubstantiated claims about last year’s election.

“It’s a game-changer in that the environment we have talked about existing now is a reality,” said Matt Masterson, a former top election security official in the Trump administration. “We told election officials, essentially, that you should assume this information is already out there. Now we know it is, and we don’t know what they are going to do with it.”

The software copies came from voting equipment in Mesa County, Colorado, and Antrim County, Michigan, where Trump allies had sue unsuccessfully challenging the results from last fall.

The Dominion software is used in some 30 states, including counties in California, Georgia and Michigan.

Election security pioneer Harri Hursti was at the South Dakota event and said he and other researchers in attendance were provided three separate copies of election management systems that run on the Dominion software. The data indicated they were from Antrim and Mesa counties. While it’s not clear how the copies came to be released at the event, they were posted online and made available for public download.

The release gives hackers a “practice environment” to probe for vulnerabilities they could exploit and a road map to avoid defenses, Hursti said. All the hackers would need is physical access to the systems because they are not supposed to be connected to the internet.

“The door is now wide open,” Hursti said. “The only question is, how do you sneak in the door?”