Biometric Authentication Thresholding for Lower False Acceptance
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Solution Overview
Problem
Existing authentication devices have a fixed threshold for determining user authentication, which limits the ability to decrease the false acceptance rate for erroneously authenticating individuals other than the preregistered user.
Innovation Solution
An authentication device that dynamically adjusts the threshold for authentication based on the number of successful biometric authentication events associated with specific terminal and user combinations, increasing the threshold when a predetermined number of successes is reached to reduce false acceptance rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed threshold is used for authentication determination, then the authentication process is simple and fast, but the false acceptance rate cannot be decreased below the set value
Solution Approach 1:
The patent implements dynamic threshold adjustment based on the number of successful authentications for each user-terminal combination. The threshold is not fixed but changes over time: it increases when a predetermined number of successes is reached, thereby reducing false acceptance rates. This dynamic adaptation resolves the contradiction by making the authentication process more reliable without requiring a completely complex system redesign.
Solution Approach 2:
The patent changes the authentication threshold parameter based on accumulated authentication success data. By monitoring the number of successful authentications and adjusting the threshold parameter accordingly, the system achieves lower false acceptance rates. This parameter change approach allows the system to adapt its security level without fundamental structural changes.
2Reliability
If the authentication threshold is increased to decrease false acceptance rate, then security is improved, but the probability of legitimate users being rejected increases
Solution Approach 1:
The threshold dynamically adapts based on the authentication history of each user-terminal combination. For legitimate users with many successful authentications, the threshold increases to prevent impostor access. For users with fewer successes, the threshold remains lower to ensure they can still authenticate. This dynamic behavior resolves the contradiction by applying different threshold levels contextually.
Solution Approach 2:
The patent applies different threshold values to different user-terminal combinations based on their individual authentication histories. Each combination has its own locally optimized threshold rather than a global uniform threshold. This allows the system to maintain high security for established legitimate users while preserving ease of operation for all users.
Data Source
AI summary
An authentication device authenticates a user using biometric information. The authentication device including: a storage unit, a first acquisition unit, a second acquisition unit, a controller, an authentication processing unit, and an update processing unit. When the first acquisition unit acquires identification information, and a combination for which the number of successes for the acquired identification information is greater than or equal to a predetermined number is present in combination information, the controller sets a threshold such that a false acceptance rate for erroneously authenticating a person other than a registered user becomes lower than when the combination is not present.