A secure fingerprint authentication method and system

Abstract

The invention provides a safe fingerprint verification method and a system, and a safe fingerprint verification system is constructed by using an image acquisition unit, a verification characteristic extraction unit, an assisted characteristic extraction unit, a template encryption unit, a template storage unit, a registration parameter computing unit, a template decryption unit and the like. The method and the system provided by the invention take a fuzzy safety box method as a basic framework, adopt the number of ridge lines between the position of a fingerprint detailed point and the adjacent three detailed points thereof as verification characteristics, extract stable reference points from fingerprints and blocking direction fields of the peripheral specific neighborhoods thereof as assisted characteristics, use a method based on the direction field mutual information to evaluate the coincidence degree of the fingerprint registration, and search the optimum parameters by a searching strategy from roughness to refinement, namely, the optimum parameters are the registration parameter for the template fingerprint and the querying fingerprint. The registration parameters are used to convert the querying fingerprint characteristics, and encryption and verification operation are carried out on the template fingerprint by using the converted querying fingerprint verification characteristics.

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...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of information leakage in the security fingerprint authentication system, and propose and implement a method based on direction field mutual information to solve the encryption domain registration problem in the Fuzzy Fingerprint Vault system, and propose in the system implementation feature selection method

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