Real-Time Signature Verification for Accessible Card Authentication
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Solution Overview
Problem
Existing transaction authentication methods, such as PIN entry and signature comparison, are cumbersome and time-consuming, particularly for individuals with disabilities and on new POS screens, and do not effectively leverage digital signatures for real-time verification.
Innovation Solution
A system and method utilizing a mobile device and POS terminal to capture and compare digital signatures in real-time, evaluating features like length, time, orientation, area, and pressure changes, with a rules engine verifying the transaction signature against a reference signature using artificial intelligence and hashing for secure authentication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PIN entry is used for authentication, then security is maintained, but ease of operation deteriorates for handicapped persons and on new POS screens
Solution Approach 1:
The patent captures a digital copy of the user's signature on the touchscreen display and compares it to a stored reference signature. This digital copying approach replaces the need for physical signature pads or complex PIN entry, making the process easier for handicapped persons while maintaining security through automated verification.
Solution Approach 2:
The patent replaces mechanical signature capture devices (signature pads) and manual PIN entry with a touchscreen-based digital signature system. The touchscreen captures signature data directly through software, eliminating the need for separate hardware components and simplifying the user interaction.
2Measurement precision
If letter-by-letter signature comparison is used, then verification accuracy is improved, but time consumption and complexity increase
Solution Approach 1:
The patent transforms the signature verification process from letter-by-letter comparison to feature-based comparison. It extracts key parameters such as signature length, area, orientation, and pressure characteristics, then compares these condensed features against reference values. This parameter transformation maintains verification accuracy while dramatically reducing the time and computational complexity required.
Solution Approach 2:
The patent extracts only the essential features from the complete signature data (length, area, orientation, pressure points) rather than analyzing every individual stroke or letter. This selective extraction of critical parameters enables rapid verification while preserving the accuracy needed to distinguish genuine signatures from forgeries.
3Reliability
If traditional signature verification is used, then security is maintained, but productivity deteriorates due to time-consuming manual processes
Solution Approach 1:
The patent performs preliminary capture and analysis of signature features during the transaction process itself, rather than requiring separate verification steps. The system captures the signature, extracts features, and compares them in real-time as part of the transaction flow, eliminating post-transaction verification delays and improving overall processing speed while maintaining security.
Data Source
AI summary
A system and method for verifying a signature in real-time when authenticating a card-based transaction. Initially, a digital reference signature is captured on a mobile device, sent in hashed form to a rules engine, and evaluated for features such as length, time, orientation, area, and pressure changes. Subsequently, a digital transaction signature is captured on a POS terminal, sent in hashed form to the rules engine via an acquirer, and evaluated for the same features. The rules engine compares the features of the signatures. If the transaction signature is verified, the rules engine sends an authentication token to the acquirer, and the acquirer sends the token and an authorization request to an issuer. If not, the acquirer sends a denial message to the merchant. If the power level of the POS terminal is insufficient to properly capture the transaction signature for effective evaluation, then an alternative authentication method is used.