Patent ID: 7869634

Claim:
A system comprising: first extraction means for extracting first angle data and first distance data relating to different parts of a user's signature to obtain a signature trace; normalization means for generating a normalized signature trace by determining a plurality of temporally equidistant points on the signature trace, wherein an arc length of the signature trace is a unit measurement of length and a total time to produce the signature trace is a unit measurement of time; second extraction means for extracting second angle data and second distance data relating to different parts of the normalized signature trace, wherein the second angle data and second distance data are selected such that variance between signatures from the user is minimized and variance between signatures from other users is maximized; registration means for storing a reference data file comprising reference angle data and reference distance data extracted from a plurality of samples of a user's signature; comparison means for comparing the data extracted by the second extraction means during an authentication phase to the reference angle data and the reference distance data stored in the reference data file, according to predefined verification criteria; and verification means for generating an output indicative of a match between the user's signature and the reference angle data and the reference distance data in dependence on said comparing, wherein the second extraction means is implemented in a computing device.