Discuss handwriting authentication.

What will be an ideal response?

We are very familiar with having to sign our name as a form of identifying ourselves. While our handwriting may be closely copied, the way we write our signature is much more difficult to mimic. As we write, the speed, pen pressure, and stroke of the letters varies. These factors are built into a biometric template for handwriting authentication. The user must sign their name on a digital graphics tablet, which captures their three dimensional signature characteristics. While the actual written signature is two dimensional, the pressure of the stylus on the tablet, the acceleration used in the movements of the stylus, and the user's handwriting rhythm provide the third dimension of characteristics.