The Nation: Is there a potential conflict between massive encryption and the lawful investigation of crimes?

Snowden: This is the controversy that the attorney general and the FBI director were trying to create. They were suggesting, “We have to be able to have lawful access to these devices with a warrant, but that is technically not possible on a secure device. The only way that is possible is if you compromise the security of the device by leaving a back door.” We’ve known that these back doors are not secure. I talk to cryptographers, some of the leading technologists in the world, all the time about how we can deal with these issues. It is not possible to create a back door that is only accessible, for example, to the FBI. And even if it were, you run into the same problem with international commerce: if you create a device that is famous for compromised security and it has an American back door, nobody is gonna buy it. Anyway, it’s not true that the authorities cannot access the content of the phone even if there is no back door. When I was at the NSA, we did this every single day, even on Sundays. I believe that encryption is a civic responsibility, a civic duty.