Dynamic Electronic Signature Capture via Touch Screen and Camera
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Solution Overview
Problem
Conventional electronic signature methods require private keys and public key infrastructure (PKI), which can be cumbersome and do not accurately represent traditional handwritten signatures, discouraging their use.
Innovation Solution
A method using a web server communicating with an electronic device equipped with a touch screen and dynamic image capturing module to capture and compile a handwritten signature as a dynamic image and audio signal, stored as a streaming file, and executed as an electronic signature without the need for private keys or PKI, incorporating a timestamp for security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electronic signatures (digital signatures) are used, then security and authentication are provided through PKI, but the system complexity increases due to private key storage and dedicated security programs
Solution Approach 1:
The patent extracts the core authentication function from the complex PKI infrastructure. Instead of requiring full PKI implementation with private keys and certificate authorities, the invention captures only the essential signature characteristics (handwriting image, pressure, speed, trajectory) directly from the touch screen, eliminating the need for private key storage and dedicated security programs while maintaining authentication capability
Solution Approach 2:
The patent creates a simplified copy of the traditional signature process. Rather than implementing the full PKI cryptographic system, it captures visual and dynamic characteristics of handwriting through touch screen data (coordinates, pressure, speed, time stamps) and uses these captured parameters as the authentication basis, replacing complex cryptographic copies with direct behavioral copies
2Reliability
If conventional digital signatures are used, then authentication is achieved, but the visual appearance deviates greatly from traditional handwritten signatures
Solution Approach 1:
The patent transitions from static digital signature images to dynamic signature representation. It captures real-time handwriting parameters including pressure variations, writing speed, acceleration, and time stamps, creating a living signature that reflects the actual signing process. This dynamic approach preserves the visual and behavioral characteristics of traditional signatures while enabling automated verification
Solution Approach 2:
The patent enriches the signature representation by capturing multiple dimensions of handwriting characteristics. It records pressure intensity (analogous to color intensity), writing speed variations, and temporal patterns, creating a multi-dimensional signature profile that visually and dynamically resembles traditional handwriting rather than static text strings
3Reliability
If PKI and private keys are required for electronic signatures, then security is provided, but user acceptance decreases due to cumbersome operation
Solution Approach 1:
The patent enables self-service signature capture through the touch screen interface. Users naturally sign their names by touching the screen, and the system automatically captures the handwriting parameters (coordinates, pressure, speed, time) without requiring users to understand or configure security settings, manage private keys, or install security software. The signature process becomes as simple as writing on paper
Solution Approach 2:
The patent replaces the mechanical PKI system (private key generation, storage, and management) with a direct touch screen capture mechanism. Instead of users interacting with complex cryptographic operations, the system directly records the physical act of signing through touch screen sensors, substituting mechanical key management with intuitive touch-based signature capture that users can perform naturally
Data Source
AI summary
In a method for generating an electronic signature, a web server provides a webpage to be displayed on a touch screen of an electronic device, receives a representative signal of a handwritten signature inputted by a signer and a dynamic image that presents a motion of the signer during signing the handwritten signature captured by the dynamic image capturing module simultaneously with the inputting of the handwritten signature. Afterward, the web server stores the dynamic image as a streaming file, compiles a data file that includes the representative signal and the streaming file, and executes the data file in the webpage as an electronic signature.