Yahoo Chief Information Security Officer Bob Lord on encryption: "Yes, it's used by terrorists. It's also used by people who are looking to voice their opinions on issues and to save lives."
FBI Director James Comey testifies March 1 before the House Judiciary Committee on the encryption of the iPhone belonging to one of the San Bernardino attackers.
Nicholas Kamm/AFP/Getty Images
FBI Executive Assistant Director for Science and Technology Amy Hess (from left) testifies on encryption Tuesday before a House panel, alongside the New York City Police Department's Thomas Galati and Indiana State Police Office Capt. Charles Cohen.
Manuel Balce Ceneta/AP
The official FBI seal is seen on an iPhone camera screen outside the agency's headquarters. With help from a third party, the FBI managed to unlock the iPhone used by one of San Bernardino shooters.
Chip Somodevilla/Getty Images
FBI Director James Comey testifies that Congress should require digital encryption programs to allow access by law enforcement. The issue pits privacy against public safety.