Federal authorities are concerned about new research showing U.S. prisons are vulnerable to computer hackers, who could remotely open cell doors to aid jailbreaks. …

“You could open every cell door, and the system would be telling the control room they are all closed,” said John J. Strauchs, a former CIA operations officer who helped develop a cyber-attack on a simulated prison computer system and described it at a hackers’ convention in Miami last week.