Biometric Matching Keys Using Auxiliary Matrices to Block Feature Inference
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Solution Overview
Problem
Existing cancellable biometrics schemes lack sufficient unidirectionality in transformations, leading to vulnerabilities where original features can be inferred from registered and matching data, and there is a risk of key leakage, compromising security.
Innovation Solution
A matching system utilizing random regular matrices for registration and matching keys, along with an auxiliary key matrix, generates concealed vectors through matrix products to ensure secure matching and key updates, preventing inference of original features and key leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transformation is made unidirectional to prevent key recovery, then security against key leakage is improved, but original features can still be inferred from registered and matching data
Solution Approach 1:
The patent introduces an auxiliary key matrix as an intermediary component that enables matching operations while preventing inference of both original features and transformation keys. The auxiliary key matrix acts as a mediator between the registered concealed vector and matching concealed vector, allowing secure comparison without exposing sensitive information.
Solution Approach 2:
The patent combines multiple transformation matrices (registration key matrix and matching key matrix) with the auxiliary key matrix to create a composite security structure. This composite approach ensures that even if one component is compromised, the overall system remains secure against both key recovery and feature inference attacks.
2Ease of operation
If registration key and matching key are made identical to simplify key management, then ease of operation is improved, but key leakage risk increases
Solution Approach 1:
The patent segments the key management into three distinct components: registration key matrix, matching key matrix, and auxiliary key matrix. This segmentation allows each key to have a specific function while collectively providing enhanced security, preventing the system from relying on a single key that would be vulnerable to leakage.
3Reliability
If random matrices are used for transformation to enhance security, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent changes the parameters of the transformation matrices by introducing the auxiliary key matrix with specific mathematical properties. This parameter change enhances security while maintaining computational efficiency, as the auxiliary key matrix enables straightforward matching operations through vector-matrix multiplication without requiring complex computational procedures.
Data Source
AI summary
A matching system includes a key generation apparatus that generates a registration key matrix, generates a matching key matrix, and generates an auxiliary key matrix from a matrix product of registration key matrix and the matching key matrix; a first transformation apparatus that generates a registered feature vector from registered information input, and generates a registered concealed vector by calculating a product of the registered feature vector and registration key matrix received from the key generation apparatus; a second transformation apparatus that generates a matching feature vector from matching information input, and generates a matching concealed vector by calculating a product of the matching feature vector and the matching key matrix received from the key generation apparatus; and a matching apparatus that matches the registered information and the matching information by calculating a vector-matrix product of the registered concealed vector, the matching concealed vector and the auxiliary key matrix.