Method for managing user who uses fingerprint authentication and fingerprint authentication system therefor
Disclosed are method for managing user who uses fingerprint authentication and fingerprint authentication system therefor. The fingerprint authentication system of the present invention may perform reuse registration of access authentication that allows again or re-registers access authentication for a pre-registered user. In a case of reuse registration, when the user enters a fingerprint, the system can prevent the other person to re-register as the registered user by determining whether the fingerprint is a fake and comparing the fingerprint image for authentication with the registered fingerprint image.
1 . User management method of the fingerprint authentication system, the method comprises:
receiving, by a terminal, a reuse request for access authentication for a registered user whose access authentication is suspended and receiving a User Identification Information for the reuse request;
primary filtering wherein the terminal acquires a fingerprint image for authentication from a user's fingerprint through a fingerprint sensor and determines whether the fingerprint is a fake or biological fingerprint based on at least one of the color change, blood flow change, ridge crushing, the size change of sweat glands, and electrical conductivity of the fingerprint;
providing, by the terminal, the fingerprint image for authentication generated in the primary filtering to a registration server along with the User Identification Information;
secondary filtering wherein the registration server measures similarity by comparing the fingerprint image for authentication with the registered fingerprint image that has been registered as the User Identification Information; and
providing, by the registration server, a message to allow the re-use of access authentication for the user to the terminal when the fingerprint is judged as a biological fingerprint in the primary filtering and the similarity is measured to more than a threshold value in the secondary filtering.
2 . The user management method of claim 1 , the method further comprises:
determining, by the registration server, that the fingerprint for which the user requests the reuse is a fake fingerprint or the fingerprint is not the user's fingerprint mapped to the User Identification Information in a case that the primary filtering unit judges the fingerprint as a fake fingerprint or the similarity is measured to less than the threshold value, and providing a warning message to the terminal.
3 . The user management method of claim 1 , wherein the fingerprint image for authentication and the registered fingerprint image are RAW image files generated by the fingerprint sensor.
4 . The user management method of claim 1 , wherein the similarity measurement of the secondary filtering is to perform a similarity measurement of the pattern between the fingerprint image for authentication and the registered fingerprint image and at least one selected from the comparison of the average thickness of the ridge and valley of the fingerprints, the comparison of the number of pixels sorted by color, and the distribution of pixel gradation values.
5 . A fingerprint authentication system comprising a terminal that receives a request for reuse of access authentication for a registered user whose access authentication is suspended and a User Identification Information for the reuse request and a registration server performing the request for reuse with the terminal:
wherein the terminal comprises,
a fingerprint sensor that receives a fingerprint from the user and acquires a fingerprint image for authentication; and
a primary filtering unit that determines whether the fingerprint is a fake or biological fingerprint based on at least one of the color change, blood flow change, ridge crushing, the size change of sweat glands, and electrical conductivity of the fingerprint and providing the fingerprint image for authentication along with the User Identification Information to the registration server;
wherein the registration server comprises,
a user management unit that stores and manages fingerprint images registered in the database for the registered users; and
a secondary filtering unit that measures similarity by comparing the fingerprint image for authentication with the registered fingerprint image stored in the database as the User Identification Information and provides a message to allow the re-use of access authentication for the user to the terminal when the primary filtering unit judges that the fingerprint is a biological fingerprint and the similarity is bigger than a threshold value.
6 . The fingerprint authentication system of claim 5 , wherein, in a case that the primary filtering unit judges the fingerprint as a fake fingerprint or the similarity is measured to less than the threshold value, the secondary filtering unit determines that the fingerprint which the user requests the reuse is a fake fingerprint or the fingerprint is not the user's fingerprint mapped to the User Identification Information and provides a warning message to the terminal.
7 . The user management method of claim 5 , wherein the fingerprint image for authentication and the registered fingerprint image are RAW image files generated by the fingerprint sensor.
8 . The user management method of claim 5 , wherein the secondary filtering unit measures the similarity by performing a similarity measurement of the pattern between the fingerprint image for authentication and the registered fingerprint image and at least one selected from the comparison of the average thickness of the ridge and valley of the fingerprints, the comparison of the number of pixels sorted by color, and the distribution of pixel gradation values.