Employees who travel or work from home use a software program that generates a continually changing authentication code used to access the network. What you have methods are easy to deploy and are generally considered more secure than passwords. But they are also more expensive. Who you are identification, also called biometrics, binds the user's identity to a fingerprint, voiceprint, eyeprint, or other distinguishing physical characteristic. Biometrics provide a high degree of security but equally high infrastructure and deployment costs.
Most enterprises lack the equipment and systems to record, measure, and respond to biometric inputs.
At Cisco, we evaluate network technologies based on how effortlessly they scale. By this measure, biometrics probably won't be adopted in any but the most secure networks for quite some time. When it comes to identity, one plus one does not equal two. Two-factor identification, the technique of using two different identity methods per user, provides substantially more security than either one method alone. PKI is appealing because it scales well, is cost effective, and works for a wide range of enterprise applications.