The smart keyboard can also be used for biometric security. Specifically, the keyboard can be trained to recognize a variety of factors that identify a person—typing rhythm, speed, size of fingers, individual electrical qualities, and so on—and thus use that as a form of authentication. That provides a second step of security. Even if someone steals your password, they probably won't type it in the same way (or with the same fingers) as you do, preventing them from accessing your data. According to the researchers, the biometric authentication is both remarkably accurate and non-intrusive—unlike, say, fingerprint or retinal scanners, which require a more active approach to authentication.