Yesterday, FBI director James Comey testified before the Senate and renewed his fight to allow law enforcement access to encrypted data on apps and communication devices. That's after Apple and Google decided to offer strong encryption by default on their mobile operating systems, and as criminal and terror groups worldwide increasingly go dark by encrypting their communications. Comey wants "a secure back door," something Paul Rosenzweig says might not be possible. He's the founder of Red Branch Consulting and former Deputy Assistant Secretary for Policy in Homeland Security. He joined Tom Temin on the Federal Drive with his takeaways.