On Thursday, around the same time ISIS leader Abu Bakr al Baghdadi announced that he had survived a U.S. airstrike and promised in a recorded message to “erupt volcanos of jihad,” American officials were meeting to discuss just how hard it was to track the militant group.
Baghdadi and his followers have proven exceptionally difficult to track and kill because they’re encrypting their communications and taking steps to avoid being detected by U.S. surveillance, according to several current and former officials. Without American intelligence operatives on the ground in ISIS’s home base of Syria—and with only a limited number of surveillance planes in the air—those communications are one of the only surefire ways to keep tabs on ISIS.
In addition to encryption that American officials say has proven very difficult to crack, ISIS is also using a commercially available service that permanently deletes messages sent via the Internet, making them nearly impossible to intercept, according to an individual who was briefed on the issue Thursday. This person didn’t name the service, but one application ISIS has been known to use is called FireChat, which allows users to send messages to each other without connecting to the Internet.
U.S. intelligence and counterterrorism officials told The Daily Beast that ISIS has adjusted its communications patterns because it knows that the group is constantly being watched. Fighters have been taking extra precautions for months, but the length of time that it took the U.S. to target Baghdadi—six weeks after airstrikes began in Syria and more than three months after they began in Iraq—and the fact that he wasn’t killed in the attack suggests that ISIS is practicing tight controls on their communications, especially at the top of the organization.
“These guys have a level of discipline. They will enforce through the ranks not using cellphones,” said the individual who was briefed on ISIS counter-surveillance techniques. The group has also used couriers to convey some messages in order to avoid digital communications altogether.
Testifying before the House Armed Services Committee on Thursday, Defense Secretary Chuck Hagel acknowledged that ISIS is ducking U.S. spies, particularly now that the military is bombing the group. “ISIL fighters have been forced to alter their tactics—maneuvering in smaller groups, hiding large equipment, and changing their communications methods,” Hagel said, using the government’s preferred acronym for the militant group.
A former U.S. official said that another factor has been complicating efforts to find ISIS members: the lack of combat troops on the ground to follow up on any leads collected by intelligence agencies or drones, which are monitoring the battlefield from the air. “When you literally have a force on the ground, you’re in a better position to take advantage of these communications,” the former official said.