Mobile Device Shared Digital Signing via Optical Authentication
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Solution Overview
Problem
Existing digital signing systems are cumbersome and require smart card readers and PCs, limiting their use for shared digital signing by multiple users, especially in remote locations, and lack reliability and safety.
Innovation Solution
A method and system for shared digital signing using remote processors with databases for user authentication, mobile devices for document display and signature, and peer-to-peer data transmission, eliminating the need for smart card readers and PCs, ensuring secure and reliable multi-user signing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If smart card readers and PCs are used for digital signing, then signature verification reliability is improved, but device complexity and ease of operation deteriorate
Solution Approach 1:
The patent extracts the digital signing functionality from complex dedicated hardware (smart card readers, USB devices) and implements it in mobile devices with camera and display. The authentication is performed by capturing an image of the signature and verifying it against stored reference images, eliminating the need for specialized signing hardware while maintaining verification reliability.
Solution Approach 2:
The patent replaces the mechanical hardware-based signature verification system (smart card readers, USB tokens) with an optical/image-based system. Instead of requiring physical contact with specialized devices, users simply capture a photo of their signature with the mobile device camera, substituting mechanical interaction with optical capture and digital image processing.
2Reliability
If smart card readers and dedicated USB devices are required, then signature security is improved, but ease of operation and adaptability deteriorate
Solution Approach 1:
The patent makes the signature verification system universal by implementing it in mobile devices that users already possess and use daily. The same mobile device can capture the signature image, store reference images, perform verification, and even serve as the signing instrument, eliminating the need for separate dedicated hardware and greatly improving ease of operation.
Solution Approach 2:
The system enables self-service by allowing users to register their own signature images using their mobile device camera and to perform verification operations independently without requiring specialized hardware or assistance from authentication authorities. The mobile device itself provides all necessary functions.
3Reliability
If multiple users share a document through sequential signing, then digital signing capability is achieved, but productivity and ease of operation deteriorate
Solution Approach 1:
The patent implements preliminary action by allowing all authorized users to be pre-identified and prepare their signatures in advance. The system can verify multiple signatures sequentially or in parallel using each user's mobile device, and the document can be prepared with multiple signature fields ready for capture, significantly improving productivity compared to sequential manual signing processes.
Data Source
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AI summary
A method for digitally signing a digital document by a plurality of users (4', 4"), comprising the following steps: - preparing a remote processor (2) provided with a database (3) containing authentication information associated with users (4', 4") of the service; - electronically transmitting first identification information of the first electronic device (5) from the first electronic device (5) to the remote processor (2); - checking the identity of the first user (4'), on the basis of the first identification information, by interrogating the database (3); - electronically transmitting from the first mobile electronic device (5) to the second mobile electronic device (6) information designed to allow a display of the digital document (DO) on the second mobile electronic device (6); - electronically transmitting second identification information of the second electronic device (6) from the second electronic device (6) to the remote processor (2); - checking the identity of the second user (4"), on the basis of the second identification information, by interrogating the database (2); - electronically sending, in the case of a positive outcome of the identity checks, a notification of signature by the second user (4") to the first electronic device (5) so as to complete the digital signature of the electronic document (DO) by the first and the second user (4', 4").