Patent ID: 6836554
Filing Date: 2004-12-28
Classification: G06F,G06K,G07C

Abstract:
A computer system comprising one or more central processing units and one or more memories, the system further comprising:one or more sensors that sense one or more characteristics of a user and convert the characteristics into a first digital representation that is stored in one or more of the memories, the first digital representation having one or more subcharacteristics, the subcharacteristics being invariant over time, insensitive to common sensing artifacts, and capable of being repeatably extracted; a distortion process that selectably distorts the first digital representation into a distorted digital representation by distorting at least one of the subcharacteristics, the distortion process being repeatable and non-invertible; and a comparison process that compares one or more sets of the distorted subcharacteristics to one or more stored sets of distorted subcharacteristics to determine the identity of the user.