Using the technology disclosed in the patent assigned to Apple Inc. (see link below) encode fingers and/palm into 3D fourier frequency domain descriptions (is there a wavelet version?). Watch a subset of them over time and discover what is unique about them over the duration of a gesture when compared to a different user. Implication: that positive identification could be transparent to an interactive use of a given application such as viewing a "for your eyes only" document. No need to allocate extra time to positively identify the observer or controller - it is integral to the process of interacting with the document on the device (iPad in this case).
http://tinyurl.com/y8nww3e
identification
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