This image was drawn on the iPhone with an application called DoodleBuddy. I 'signed' my nickname to illustrate how the signature capture would look when complete. For signature dynamics the relative timing and pressure are recorded as well as the sequence of pixels turning dark. The signal is then compressed into a compact form. Using a comparison algorithm that looks for repeatability within a chosen variance of these three parameters, the signer is verified to be a particular person. This technology has been around for decades. The iPhone and other touchscreen devices already have the hardware to make this possible. Many suitable algorithm patents have expired and are in the public domain.
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