At the RSA security conference in San Francisco last month, Mayank Upadhyay, a principal engineer at Google who specializes in security, became the first person at Google to speak in public about that research. He said that using personal hardware to log in would remove the dangers of people reusing passwords or writing them down. He also thought people would feel some familiarity with the approach. “Everyone is familiar with an ATM. What if you could use the same experience with a computer?”