Biometric identification system

0001The present invention relates to a biometric identification system to identify a person on the basis of a electronic fingerprint sensor.

0002Biometric identification systems for personal identification or use for the verification of an access authorization preferably a fingerprint sensor with the electronic Means to receive a fingerprint and its essential Forms with correspondingly stored comparative data can compare. Such comparative data are in particular the so-called minutiae, the relevant the pose of their fingertip. These points are particularly the branch points of the grooves and ridges of Skin surface.

0003Biometric identification systems based on the recognition a human fingerprint is based, can be attributed to different types deceive, so that, for example with the identification system secure electronic device also can be used by a person who is not authorized to do so is. This can happen, for example, by a by a thin Fat on the provisions for the finger contact surface Sensor residue formed impression again to receive a Fingerprint is used. A further possibility, a to fool a biometric identification system is produce an artificial finger, on which a fingerprint is reproduced, the basis of the identification system identified as connected to an access authorization becomes. Such artificial fingernail allows then the constant access to the identification system secure device. To enroll in the possession of a bringing readily available fingerprint, can a finger of an authorized person (force) of hand are separated and then for receiving the fingerprint to be used.

0004Object of the present invention is to provide a biometric specify identification system with a fingerprint sensor, in which it is difficult or impossible possible, illegally an identification or authorization thereby attain that without the participation of the person concerned the fingerprint is taken.

0005This object is the biometric identification system solved with the features of claim 1. refinements result from the dependent claims.

0006The biometric identification system of the invention are used as reference to identify a person's fingerprints or their relevant characteristics of several fingers stored. The process of identification is introduced, by specifying by the system, which fingers the person is used for identification. The question Finger must then placed on the fingerprint sensor , Will be such that the fingerprint is detected and evaluated can. The evaluation is usually done in the way, that relevant characteristics of the fingerprint extracted (minutiae) be and with the data of a stored corresponding Data set are compared for a match. If the result is a match, the predetermined the Security requirements, which shall be deemed identified. In the system according to the invention, the user is advance in the dark, which the candidate Finger is used for the identification. A deception of the system is particularly difficult if a respective record from relevant for identification forms a fingerprint for all mappable finger of the person is stored, preferably for all ten fingers. If then the system, for example by using an appropriate Random function, an arbitrarily selected finger as pretending means of identification, an illusion is only possible, although for this finger a counterfeit fingerprint is available. The system determines so, with what Finger must identify the person. After a predetermined Number of failed attempts locks the system or locks at least one specific function provided to the conditional access is to be checked.

0007The system can even without using a random generation be programmed for specific selection criteria such that a user only with difficulty, to by looking System of a sequence of fingerprints requested for Your authentication is used. Will multiple devices with the identification system secure, can or by the system in a particular sequence requested for specific criteria fingerprints of device to device be programmed differently. The criteria can arbitrarily set in principle be. For example, the morning of the left index finger and in the afternoon of the right middle finger for identification be used. as can also the time or Newest determine the selection of the respective finger. A but entirely random selection has the advantage that it is not is possible, one of the choices underlying systematics auszuforschen.

0008In the identification system of the invention will become apparent the following advantages:<sl><li>A remaining on the sensor residual imprint of a previously finger used is worthless if it is ensured that not twice the same footprint is required. to this Purpose, particularly in a random selection of the finger excluded as an additional condition to repeat will. A further advantage is that it is difficult to all ten fingerprints of a person in a usable copy version or cut into the possession of ten bringing fingers. </li><li>A further development of the system provides that not only a Fingerprint is detected, but that for verifying a Conditional access a plurality of fingers in a by System predetermined number or sequence on the fingerprint sensor must be connected. This is also the probability greatly reduced in the query fingerprint happened to be an imitation of the respective finger ready to have. If several fingerprints scanned by the system, it is necessary for the counterfeiter, this Majority to dispose of copied fingers or fingerprints. The system is characterized for higher security levels useful. Also in this case it is possible, the number of Images of fingerprints and / or the respective selection determine the imaged finger by a random allow.</li></sl>