A system for graded authentication comprising user data obtained from a user during at least one previously successful authentication attempt, past circumstantial data associated with {HEAD ~ the at least one previously successful authentication attempt} and associated with enrollment data for the user, and a trust engine which generates a level of trust associated with {TAIL ~ a current authentication attempt} based on the comparison of current circumstantial data associated with the current authentication attempt with the past circumstantial data associated with the at least one previously successful authentication attempt 
A system for graded authentication comprising user data obtained from a user during at least one previously successful authentication attempt , past circumstantial data associated with { HEAD ~ the at least one previously successful authentication attempt } and associated with enrollment data for the user , and a trust engine which generates a level of trust associated with { TAIL ~ a current authentication attempt } based on the comparison of current circumstantial data associated with the current authentication attempt with the past circumstantial data associated with the at least one previously successful authentication attempt
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