1. A computer-implemented process for establishing the authenticity of a user, comprising: using a computer to perform the following process actions: inputting a plurality of pre-established authentication factors each of which corresponds to one or multiple attributes associated with the user, or historical patterns of one or more attributes associated with the user, or both, and each factor of which has a confidence level associated therewith that estimates a reliability of that factor in establishing the user's authenticity; inputting readings captured by one or more sensors, each sensor of which senses a one of said attributes associated with the user; employing the inputted sensor readings to quantify each authentication factor confidence level; establishing an overall confidence level based at least in part on a combination of the individual confidence levels associated with the plurality of authentication factors; and designating a user to be authenticated whenever the established overall confidence level exceeds a prescribed authentication level.