But back doors aren’t the answer, others say. Weakening security for everybody doesn’t automatically mean you can catch the bad guys, says Bruce Schneier, a cryptography and security expert who has authored 13 books. “This notion that encryption suddenly makes this impossible to uncover makes no sense. Encryption isn’t magic,” says Schneier, who is also chief technology officer at Resilient Systems, a cybersecurity company, and a fellow at Harvard University’s Berkman Center for Internet & Society. “If the FBI, or the Chinese government, or the [National Security Agency] wanted to get into your computer, they’d be in your computer” via advanced hacking.

Source: Rethinking privacy after the Paris attacks – MarketWatch