1. A method of filtering a master database of enrolled biometric representations to generate a subset of enrolled biometric representations against which a presented biometric may be authenticated against, the method comprising the steps of: matching individual ones of the enrolled biometric representations to a filter and generating a score for each of the matches, the filter including a plurality of biometric representations; generating vectors of the scores for each of the matched enrolled biometrics; associating the individual ones of the enrolled biometrics with their generated vectors; using the generated vectors in an authentication request to determine a subset of the enrolled biometrics against which a presented biometric should be authenticated against.