Biometric Authentication Device Preventing Spoofing via Mismatch Analysis

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Solution Overview

Problem

Existing biometric authentication methods are vulnerable to spoofing even when illegally acquired biometric information is used, as the information itself is legitimate and cannot be differentiated from genuine data.

Innovation Solution

An authentication device and method that compares feature values extracted from acquired biometric information with master data, and determines not to authenticate if there is no difference in feature values that resulted in a mismatch, effectively preventing spoofing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If biometric authentication uses illegally acquired biometric information, then authentication can be performed, but spoofing cannot be prevented

Engineering Contradiction:

Improveauthentication securityVSAvoidspoofing vulnerability

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The system performs preliminary actions by acquiring biometric information multiple times before authentication and storing feature values that result in mismatches. This preliminary collection and analysis of mismatched feature values enables the system to detect spoofing attempts before final authentication occurs, resolving the contradiction between allowing authentication and preventing spoofing.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system implements feedback by comparing acquired biometric information against stored feature value master data and using the results to determine whether to proceed with authentication. The feedback loop includes analyzing mismatched feature values from multiple comparisons and using this information to make final authentication decisions, thereby preventing spoofing while maintaining legitimate authentication capability.

Inventive Principle:

Principle #23Feedback

2Reliability

If multiple comparisons are performed to prevent spoofing, then authentication security improves, but authentication time increases

Engineering Contradiction:

Improveanti-spoofing capabilityVSAvoidauthentication time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The system performs preliminary extraction and storage of feature values during the authentication process, so that when multiple comparisons are needed, the feature values are already prepared. This preliminary preparation reduces the time required for subsequent comparison operations while maintaining the security benefits of multiple comparisons.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12216748B2Authentication device, authentication method, and recording medium

Publication Date: 2025.02.04 NEC CORP

AI summary

An authentication device includes a comparison unit and a determination unit. The comparison unit compares, with feature value master data for authentication, each feature value needed for authentication that has been extracted from a plurality of pieces of acquired biometric information. The determination unit determines not to provide authentication when, as a result of comparison by the comparison unit, there is no difference in each of the feature values that resulted in a mismatch.