More than a decade ago, the keynote speaker at a major annual cybersecurity conference strode into the spotlight and predicted the death of the password. "They just don't meet the challenge for anything you really want to secure," he told the audience of computer experts in San Francisco. The speaker was Bill Gates, the preeminent cyber-prophet of the day, but his forecast has not yet come true. We've certainly gotten closer to the password's demise. Millions of people use their fingerprints to unlock their smartphones every day, and tech companies are experimenting with new security features that rely on biometrics like user's speech habits or iris patterns.