Fuzzy Biometric Digital Signature Verification
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Solution Overview
Problem
Traditional digital signature schemes using biometric data face challenges in verifying signatures due to measurement errors in biometric templates, leading to difficulties in matching and authentication, as two biometric templates of the same individual are never completely identical.
Innovation Solution
A method and device that verify the validity of a digital signature by comparing a verification biometric template with an enrollment biometric template, using the enrollment template as a public key, allowing for small differences between the two templates to ensure authenticity and prevent fraud.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional digital signature schemes are used with biometric data, then signature verification is performed under a single public key, but measurement errors cause biometric templates to differ, making verification problematic
Solution Approach 1:
The patent changes the parameter of public key representation from a single fixed value to a fuzzy set of possible values. By representing the public key as a biometric template that inherently allows for variation, the system accommodates measurement errors while maintaining verification reliability. The verification process compares the new biometric template against the stored template using similarity metrics rather than exact matching.
2Adaptability or versatility
If biometric templates are used as public keys allowing for variations, then authentication flexibility improves, but traditional signature verification schemes become inadequate
Solution Approach 1:
The patent introduces a fuzzy set representation as an intermediary between the biometric template and the digital signature verification process. This intermediary layer allows the system to handle biometric variations without requiring complete redesign of the verification scheme. The fuzzy set acts as a mediator that translates variable biometric data into a form compatible with digital signature verification.
3Measurement precision
If exact matching is used for biometric templates, then verification accuracy is high, but any measurement error causes verification failure
Solution Approach 1:
The patent applies beforehand cushioning by pre-processing biometric templates into fuzzy set representations that anticipate and accommodate future measurement variations. Instead of waiting for errors to occur and then handling them, the system proactively transforms the templates into a form that inherently absorbs expected variations, ensuring verification success while maintaining accuracy.
Data Source
Figure 1
AI summary
The present invention relates to a method and a device of verifying the validity a digital signature based on biometric data. A basic idea of the invention is that a verifier attains a first biometric template of the individual to be verified, for instance by having the individual provide her fingerprint via an appropriate sensor device. Then, the verifier receives a digital signature and a second biometric template. The verifier then verifies the digital signature by means of using either the first or the second biometric template as a public key. The attained (first) biometric template of the individual is compared with the received (second) biometric template associated with the signature and if a match occurs, the verifier can be confident that the digital signature and the associated (second) biometric template have not been manipulated by an attacker for impersonation purposes.