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Unwillingness or inability to interact with biometric input devices.
A fuzzy extractor reliably extracts a uniformly random string from a biometric input while stored helper data assist the reconstruction.
The recognition accuracy of a biometric system is highly sensitive to the quality of the biometric input.
Adler [187] proposed a "hill-climbing" attack against the Biometric Encryption™algorithm in which a sample biometric input is iteratively modified while the internal comparison score is observed.
Here an error correction code syndrome is stored as part of the template and applied during authentication in order to reconstruct the original biometric input.
In case a key-binding system can be run in secure sketch mode (e.g., [15, 16]), original biometric templates can be reconstructed from another biometric input.
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Valve, the company behind games like Portal and Half-Life and the HTC Vive VR headset has been experimenting with biometric inputs for years.
During authentication, biometric inputs are transformed and a comparison of transformed templates is performed.
Stable features are located during a single registration procedure in which several biometric inputs are measured.
Operation mode (see Figure 14): Generally, at enrollment, non-invertible transforms are applied to biometric inputs choosing application-dependent parameters.
Since reconstruction of original biometric templates should not be feasible the synthetization of original biometric inputs is highly complicated (e.g., [187]).
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