Geoff Brown, who served as the city's CISO from 2016 through 2021, is now a vice president at cybersecurity firm Recorded Future.

Mayor Bill de Blasio said the city has "not seen information compromised or a ransom demand," but added that the situation is "evolving."

During an annual training exercise, city officials said cybersecurity, even during a health crisis, is "like a chess match" with a sentient opponents.

NYC Secure will tell New Yorkers if their phones encounter unsafe networks. The city insists it's not tracking users.