MIAMI — The mystery surrounding a Russian intrusion into Florida’s voter registration systems during the 2016 election deepened on Tuesday when Gov. Ron DeSantis said that the F.B.I. had revealed to him which counties in the state had been targeted — then required the governor to keep the information secret.
At a news conference in Tallahassee, Mr. DeSantis, a Republican, said that officials from the F.B.I. and the Department of Homeland Security had asked him to sign a nondisclosure agreement pledging not to identify the two counties that fell victim to a “spearphishing” attempt by Russian hackers.
That the Russians breached security protocols in not one but two counties was previously unknown. Last month, the Mueller reportconfirmed that the F.B.I. believed that the Russian military intelligence unit known as the G.R.U. breached “at least one Florida county government.” Elections officials said that if the intrusion came through a spearphishing email, as it apparently did, it would put hackers in a position to potentially alter registration data, though not the tabulation of ballots.
.. Mr. DeSantis, who took office in January, had insisted on being briefed on the hacking after the release last month of the report by Robert S. Mueller III, the special counsel. Upon reading the report, the governor expressed frustration at the F.B.I. for not informing the state of its findings earlier, and vowed to make the details public if they were not classified.
.. “This is not acceptable, to keep secret attacks on the most public of our political processes: our elections,” said Ion Sancho, a Democrat and the former elections supervisor of Leon County, which includes the state capital, Tallahassee.