Cyber-security is the greatest threat since the atom bomb, Apple co-founder Steve Wozniak said in an interview on the Australian TV news show Lateline.
And, he said, the threat is "getting worse and worse year by year."
In a wide-ranging interview, the man who in the early 1970s developed the first Apple computers with Steve Jobs, said, "Could they really take out our electrical system, turn off our internet?"
He also lamented the loss of privacy, saying the US government's attempt to force Apple to decrypt the cell phone used by one of the San Bernardino killers was wrong.
"What if the FBI was able to go to any company any time they felt like it and said you have to build a product our way?" he said on Lateline.
Wozniak left his R&D role at Apple in the 1980s. He is now an adjunct professor at the University of Technology Sydney.