Biometric Sensor Fraud Detection via Encoded Illumination
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Solution Overview
Problem
Optical biometric sensing devices are vulnerable to frauds such as injecting fake images or replacing the prismatic optical element with a fraudulent one, which compromises the authenticity of the biometric data captured.
Innovation Solution
The solution involves encoding the illumination radiation with time-varying parameters, such as intensity and frequency, which is reflected along with the biometric image and compared in real-time to ensure authenticity, and optionally using an identification mark on the prismatic optical element to verify its presence in the captured image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the prismatic optical element is replaced with a fraudulent element, then the device complexity is reduced, but the reliability of biometric authentication deteriorates
Solution Approach 1:
The patent applies preliminary action by encoding the illumination radiation with time-varying characteristics before it interacts with the body organ. This encoding signature is embedded in advance into the light path, allowing subsequent verification that the optical element is authentic and has not been replaced, thereby preventing fraud while maintaining device simplicity.
Solution Approach 2:
The patent implements feedback by comparing the encoded characteristics of the illumination radiation with the reflected radiation after it has interacted with the body organ. This feedback mechanism verifies the authenticity of the optical element and detects any replacement or tampering, ensuring reliable biometric authentication.
2Reliability
If encoding illumination is added to verify authenticity, then the reliability of biometric authentication is improved, but the device complexity increases
Solution Approach 1:
The patent merges the encoding illumination function with the existing main illumination means. The encoding illumination is superimposed on the main illumination radiation, allowing both functions to be achieved through a single integrated light source rather than requiring separate encoding illumination devices, thus improving reliability while minimizing the increase in device complexity.
Solution Approach 2:
The main illumination means is given multi-functionality by enabling it to serve both as the primary light source for biometric imaging and as the carrier for encoding information. This universal approach allows the same illumination system to perform authentication and verification functions without adding separate dedicated encoding illumination devices.
3Difficulty of detecting and measuring
If time-varying encoding is applied to illumination radiation, then the difficulty of detecting and replicating the encoding signal is improved, but the use of energy increases
Solution Approach 1:
The patent applies periodic action by modulating the illumination radiation with time-varying encoding characteristics that change over time. This periodic modulation creates a dynamic encoding signal that is difficult to detect and replicate, as the encoding pattern continuously evolves, while the energy consumption remains manageable through efficient modulation techniques.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively authenticates the biometric data in real-time, preventing fraudulent activities by ensuring that the image comes from the original optical block and not a replaced or tampered one, while also making it difficult to detect or replicate the encoding signal.
Implementation Method 1
the dispersion-reflected radiation carrying the biometric image of said body organ is picked up
Implementation Method 2
it is reflected by dispersion by said main face towards the first inclined side face
Implementation Method 3
encoding illumination formed by radiation of which at least one characteristic parameter is encoded in a time varying manner
Implementation Method 4
sensor means situated facing the first side face to receive the reflected radiation conveying a biometric image
Data Source
AI summary
The invention relates to a method of checking the authenticity of biometric sensing performed optically, in which a body organ (6) placed on a main face (2) of a prismatic optical element (1) is illuminated (8) with total internal reflection, and then the reflected radiation carrying the biometric image of said body organ is picked up (9). The method comprises the steps of superposing on the main illumination (8) on the main face (2) of the prismatic optical element (1), encoding illumination (14) in such a manner that it is the encoded combined radiation that is reflected by said main face (2) and picked up (9), and comparing (17) the encoded combined radiation with the encoding of the encoding illuminating radiation; thereby detecting the authenticity of the reflected radiation conveying the biometric image associated with the body organ placed on the main face.