Biological characteristic cryptographic system based on fingerprint and error correcting code

Abstract

The invention discloses a biological characteristic cryptographic system based on fingerprints and an error correcting code. The biological characteristic cryptographic system is constructed by utilizing an image acquisition unit, a feature extraction unit, a two-value fixed-length feature vector generation unit, a template encryption unit, a template storage unit and a template decryption unit and the like. The method provided by the invention comprises the following steps: adopting a triangle which is formed by detail points of three fingerprints and conforms to a certain condition; taking a six-dimensional feature vector formed by a smaller included angle between the direction of the directional field in which the side length of the triangle and the detail points are located, and a connecting line of the detail points as a fingerprint feature; carrying out training and dimension reduction, so as to obtain a two-value fixed-length feature vector; correspondingly encrypting the two-value fixed-length feature vector to be used as a template to be stored; correspondingly transforming a query fingerprint feature, so as to obtain the corresponding two-value fixed-length feature vector; and carrying out decrypting and authenticating operations on the template fingerprint by the two-value fixed-length feature vector.

Description

technical field [0001] The invention belongs to the field of biometric identification, and relates to technical fields such as image processing, pattern recognition, cryptography, and information security, and particularly relates to fingerprint registration in an encryption domain based on mutual information based on direction fields, and its application to secure fingerprint authentication method in the system. Background technique [0002] As biometrics are used more and more widely in real life, people are paying more and more attention to the security and privacy issues it brings. According to surveys, the public's acceptance of biometrics, especially fingerprints, is not very high. The reason is that they are worried about leaking their identity information, which will bring hidden dangers to information security. Theoretically speaking, the biometric system is more or less likely to be attacked, and the security of the biometric template is the most important. In th...

AI Technical Summary

Problems solved by technology

The detection of the center point of the fingerprint is a difficult problem, it is easy to introduce detection errors, and even some fingerprints are difficult to detect the center point, so the above two methods have defects

[0004] Based on the above analysis, we found that there are some deficiencies in the existing fingerprint cryptosystems based on the fuzzy commitment mechanism.

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