4. A user authentication system, comprising: a dialogue manager, executed on a processor of the user authentication system, adapted to prompt a user with multiple pass-phrases and requests the user to select a proper subset from the prompted multiple pass-phrases during authentication, wherein the prompted multiple pass-phrases are formed by selecting one or more pass-phrases from a set of pass-phrases satisfying a rule associated with the user and selecting one or more pass-phrases that do not satisfy the rule associated with the user, where the rule associated with the user is determined prior to authentication and is not suggested to the user during authentication; a selection recognizer, executed on the processor of the user authentication system, receptive of at least one user selection input and adapted to recognize user selection of a proper subset of the prompted pass-phrases based on the user selection input; a user biometric matching module, executed on the processor of the user authentication system, receptive of a user biometric input and adapted to make a match based on biometrics of enrolled users; and a user identity analysis module, executed on the processor of the user authentication system, adapted to analyze at least one potential user identity based on the match between the pass-phrases in the proper subset and the rule associated with the user, wherein said dialogue manager is adapted to recursively prompt the user with new sets of multiple, selectable pass-phrases randomly assembled from a pass-phrase corpus over multiple dialogue turns, and said user identity analysis module is adapted to combine selection results and biometric match results from each dialogue turn to yield dialogue turn results and combine the dialogue turn results from each dialogue turn to form a cumulative result and authorize the user when the cumulative result exceeds a threshold.
4. A user authentication system, comprising: a dialogue manager, executed on a processor of the user authentication system, adapted to prompt a user with multiple pass-phrases and requests the user to select a proper subset from the prompted multiple pass-phrases during authentication, wherein the prompted multiple pass-phrases are formed by selecting one or more pass-phrases from a set of pass-phrases satisfying a rule associated with the user and selecting one or more pass-phrases that do not satisfy the rule associated with the user, where the rule associated with the user is determined prior to authentication and is not suggested to the user during authentication; a selection recognizer, executed on the processor of the user authentication system, receptive of at least one user selection input and adapted to recognize user selection of a proper subset of the prompted pass-phrases based on the user selection input; a user biometric matching module, executed on the processor of the user authentication system, receptive of a user biometric input and adapted to make a match based on biometrics of enrolled users; and a user identity analysis module, executed on the processor of the user authentication system, adapted to analyze at least one potential user identity based on the match between the pass-phrases in the proper subset and the rule associated with the user, wherein said dialogue manager is adapted to recursively prompt the user with new sets of multiple, selectable pass-phrases randomly assembled from a pass-phrase corpus over multiple dialogue turns, and said user identity analysis module is adapted to combine selection results and biometric match results from each dialogue turn to yield dialogue turn results and combine the dialogue turn results from each dialogue turn to form a cumulative result and authorize the user when the cumulative result exceeds a threshold. 13. The system of claim 4 , wherein said dialogue manager is adapted to permit the user to specify at least one of: (a) a letter that must be contained in a selected pass-phrase in accordance with a selection criterion assigned to the user; (b) a word with which a selected pass-phrase must rhyme in accordance with a selection criterion assigned to the user; (c) a specific position within a prompt in which a selected pass-phrase must be located in accordance with a selection criterion assigned to the user; (d) a relationship of at least one of alphabetical order or numerical value with respect to other pass-phrases in a prompt that a selected pass-phrase must exhibit in accordance with a selection criterion assigned to the user; or (e) a specific class to which a selected pass-phrase must belong in a pass-phrase ontology in accordance with a selection criterion assigned to the user.