Just five states use currently-manufactured voting machines in all jurisdictions, researchers discovered.
Following the detection of interference by Russia during the 2016 presidential race, Homeland Security officials helped states secure election systems to deter election tampering.
Directors for the Board of Elections in Montgomery and Greene counties explain how their updated voting machines operate.
Homeland security notified 21 states, including elections officials in Ohio, that Russia had attempted to breach elections systems. Bloomberg later reported that Russian hackers attempted to gain entry to voter databases and software systems in a total of 39 states.
The deepest-known 2016 infiltration occurred in Illinois, where the records of up to 76,000 voters were downloaded by what federal investigators said was a Russian cyberattack.
There is no evidence that votes in any state were altered through hacking in 2016 or during the 2018 midterms. But U.S. intelligence officials continue to assert that Russia, China, Iran and other countries are engaged in ongoing efforts to influence U.S. policy and voters in elections.
“The big game we think for the adversaries is probably 2020,” said Chris Krebs, head of cybersecurity at the Department of Homeland Security.
The Associated Press contributed to this story.