A special pen authenticates the user's signature by comparing it to the data on file. Speed, relative speed, stroke order, stroke count and pressure are analyzed. The system compares not merely what the signature looks like, but also how it's created. It's often grouped with those devices based on physical characteristics, however, and it merits mention here because it could prove to be a useful method of verification. Keystroke dynamics can tell who's who by evaluating typing patterns.
Users enroll by typing the same word or group of words a number of times.
Verification is based on the concept that the rhythm with which one types is distinctive. Now you have a brief overview of the biometric devices currently available. Obviously there's much more to learn more about these technologies and the ins and outs of their specific applications. If you're interested, the International Biometric Group's Web site provides a good starting point. ATM security is another area of concern for banks.