NSA director says ISIS ideology 'increasingly resonating' with Americans

Adm. Mike Rogers, director of the National Security Agency, also said that the terror group's recent efforts to use cyber capabilities as a weapons system rather than only for recruiting and spreading ideology is a "great concern" to the NSA.

When it comes to responding to cyber breaches by terror groups as opposed to countries, such as North Korea and China, Rogers said that "every scenario is different."

"I don't have an easy answer," he said. "The mechanisms of what you use to apply that pressure, I think, varies by the entity you're trying to shape and let them know, 'hey, you don't want to go down this road, and when you do, you need to know there is a price you're going to pay.'"

The challenge for the NSA, Rogers told a cyber security forum, is the balance between privacy and security. It's a compromise Congress and the intelligence community must agree on by the end of the month, when the legislation that provides authority to the Foreign Intelligence Surveillance Court expires.

"We have got to create a framework for this program that enables it to generate its capabilities and insights to defend the nation, but we've got to do it in a way that ensures the privacy of our citizens and engenders greater confidence in our nation about what [the NSA] is doing," he acknowledged.

(CNN)