Fingerprint encryption template protection method and system based on orthogonal decomposition

Abstract

The invention relates to a fingerprint encryption template protection method and system based on orthogonal decomposition. In the process of registration, fingerprint acquisition, preprocessing and fingerprint feature extraction based on orthogonal decomposition are included, and dividing orthogonal codes in an orthogonal decomposition domain to obtain a fingerprint feature encryption operation domain and a feature matching operation domain independent of each other and then merging ciphertext features and matching features by orthogonal synthesis are included; a fingerprint encryption template is stored, and an orthogonally synthesized ciphertext template is stored into a library. In the process of authentication, after fingerprint acquisition and corresponding preprocessing operation are carried out, fingerprint feature extraction based on orthogonal decomposition is also carried out, feature matching is then carried out, and extracting fingerprint feature s in the feature matching operation domain by orthogonal decomposition and comparing with a feature matching domain of a stored template to carry out identity authentication. The invention can effectively protect fingerprint data privacy, has high security, and also has high safety and universality.

Description

technical field [0001] The invention belongs to the field of information security, and in particular relates to a fingerprint encryption template protection method and system based on orthogonal transformation. Background technique [0002] Fingerprints are the lines formed by the bumpy skin on the pads of the ends of human fingers, and are naturally formed physiological characteristics in the process of human evolution. Due to the universality, uniqueness and invariance of fingerprints, they are called "human ID cards". With the development of image processing and pattern recognition methods and the maturity of fingerprint sensor technology, the technology of digitizing fingerprint features for identification It has shown good application prospects in the fields of finance, public security, access control, and household registration management. However, while the fingerprint-based identification technology brings convenience, the personal privacy and security risks involve...

AI Technical Summary

Problems solved by technology

[0006] (1) The security and recognition accuracy of the biometric system cannot be considered

Traditional biometric cryptography cannot fully protect the privacy of biometric information, and untraceable biometric technology will affect the identification performance of the system;

[0007] (2) The calculation of the combination strategy of biometric features and keys is too complicated, which makes the computational complexity of biometric template generation, feature extraction and feature matching too high and difficult to implement;

[0008] (3) Only suitable for specific biometric feature extraction methods, poor robustness and universality

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