Key extraction method of palm print-palm vein double-source fuzzy vault

Abstract

The invention discloses a key extraction method of a palm print-palm vein double-source fuzzy vault. The method comprises: segmenting a set key and a cyclic redundancy code thereof and converting into integers and constructing an n-order multinomial coefficient; during registration, converting the row vectors of 2DPHCs (2D Palm Hash Code) of the palm print and the palm veins into an integer as a horizontal ordinate and mapping the horizontal coordinate on the multinomial coefficient to calculate a longitudinal coordinate, constructing a true point using the horizontal coordinate and the longitudinal coordinate, and then adding randomly generated chaff points to construct two independent FVs; during authentication, searching for candidate points in the two corresponding FVs by use of the row vectors of 2DPHCs of the palm print and the palm veins, respectively; and if the candidate points contain more than (n+1) true points, correctly reconstructing an original polynomial and extracting a key. Due to the double-source mode of the method obviously, the accuracy of authentication is improved enough to resist brute-force attack, multi-database attack and heterogeneity analysis attack, and furthermore, the privacy of original characteristics is further effectively protected.

Description

technical field [0001] The present invention extends the fuzzy safe (FuzzyVault, FV) based on 2DPalmHashCode (2DPHC) from palm print to palm vein, constructs dual-source FV extraction key by means of palm print and palm vein dual-modal features, and can replace traditional keys to realize identity authentication . Background technique [0002] Biometric comparison is usually ambiguous. When the difference between registration and authentication templates is less than a certain threshold, the sample is considered to be a legitimate user from the same individual. However, the authentication key of traditional information security requires absolutely exact matching. Consider using biometrics to extract completely stable and unchanging reliable data as keys, instead of traditional low-entropy keys, to enhance the security of existing password authentication, and to expand the application scope of biometrics to realize traditional password authentication to biometric passwords ...

AI Technical Summary

Problems solved by technology

[0003] FV is a classic biometric key extraction scheme. However, if the original biometric is used directly, there will be many security and privacy problems: the fingerprint details are limited, and the fingerprint FV constructed by it is difficult to resist brute force attacks.

The leakage of the truth points seriously destroys the privacy of the original features and seriously threatens the security of FV

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