19. A method comprising: determining, by a biometric enrollment system and for each person in a group of multiple, different people, a similarity score that represents a similarity between a biometric image of at least a portion of the corresponding person from the group of multiple, different people and a reference image, wherein the reference image is used in determining all of the similarity scores for the group of multiple, different people; sorting biometric data that includes all of the determined similarity scores using the determined similarity scores; maintaining, in electronic storage and for the group of multiple, different people, the biometric data that includes all of the sorted similarity scores; accessing a particular biometric image of at least a portion of a particular person; accessing the reference image used in computing all of the similarity scores maintained in the electronic storage; computing a particular similarity score that represents similarity between the accessed particular biometric image and the reference image; searching, by a biometric authentication system that includes at least one processor and using the computed particular similarity score, the sorted similarity scores included in the biometric data for the group of multiple, different people; and outputting a result based on determination of whether the electronic storage includes data for the particular person in the biometric data.
19. A method comprising: determining, by a biometric enrollment system and for each person in a group of multiple, different people, a similarity score that represents a similarity between a biometric image of at least a portion of the corresponding person from the group of multiple, different people and a reference image, wherein the reference image is used in determining all of the similarity scores for the group of multiple, different people; sorting biometric data that includes all of the determined similarity scores using the determined similarity scores; maintaining, in electronic storage and for the group of multiple, different people, the biometric data that includes all of the sorted similarity scores; accessing a particular biometric image of at least a portion of a particular person; accessing the reference image used in computing all of the similarity scores maintained in the electronic storage; computing a particular similarity score that represents similarity between the accessed particular biometric image and the reference image; searching, by a biometric authentication system that includes at least one processor and using the computed particular similarity score, the sorted similarity scores included in the biometric data for the group of multiple, different people; and outputting a result based on determination of whether the electronic storage includes data for the particular person in the biometric data. 31. The method of claim 19 , wherein the biometric data maintained by the electronic storage comprises the corresponding biometric image or blob data descriptive of the corresponding biometric image, the method comprising: linking, by the biometric enrollment system and for each person in the group of multiple, different people, the similarity score for the corresponding person with the corresponding biometric image or the blob data.