Dynamic Digital Watermarking for Document Validation
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Solution Overview
Problem
Current digital watermarking technologies for identification documents lack effective methods to ensure the authenticity and validation of digital documents over time, particularly in preventing fraud and ensuring the identity of the document holder.
Innovation Solution
A method and system for applying multiple digital watermarks to a digital document, where each watermark is visually presented at different time points, forming a sequence that provides validation and authentication, with temporal patterns encoding information linking the document to its issuer and holder, and correlating data between watermarks for verification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single digital watermark is applied to a digital document, then the implementation is simple and quick, but the security and validation capability over time is insufficient
Solution Approach 1:
The patent divides the watermarking system into multiple temporal segments, applying separate watermarks at different time points (first watermark at time T1, second watermark at time T2). This segmentation allows the system to validate document authenticity across different moments, significantly improving reliability while maintaining manageable complexity through modular implementation.
Solution Approach 2:
The patent implements periodic watermarking by applying watermarks at regular or irregular time intervals during document display. This periodic action creates a temporal pattern that enhances validation capability, as the sequence of watermarks provides multiple verification opportunities without requiring continuous complex processing.
2Reliability
If multiple digital watermarks are applied at different time points, then the security and authentication capability is enhanced, but the system complexity and processing requirements increase
Solution Approach 1:
The patent introduces temporal dynamics to the watermarking system, where watermarks are applied dynamically at different time points based on document display events. This dynamic approach enhances fraud prevention capability by creating time-stamped verification points, while the system manages complexity through event-driven watermark application rather than continuous complex processing.
Solution Approach 2:
The patent applies watermarks in advance at specific time points during the document lifecycle (issuance, display, validation). This preliminary action embeds verification data before potential fraud occurs, enhancing security while simplifying later validation processes by having verification information already in place.
3Loss of information
If digital watermarks are applied intermittently according to temporal patterns, then the information encoding capability is improved, but the detection and measurement difficulty increases
Solution Approach 1:
The patent uses periodic or semi-periodic temporal patterns for watermark application, creating recognizable time intervals between watermarks. This periodicity enhances information encoding capability by embedding timing data within the pattern, while simultaneously making detection easier through the predictable, repeatable nature of the intervals.
Solution Approach 2:
The patent implements feedback mechanisms where the system monitors and tracks the application and detection of temporal watermarks. This feedback loop provides verification that the temporal patterns are being correctly applied and detected, reducing measurement difficulty by confirming pattern integrity and providing correction data if deviations occur.
Data Source
AI summary
Some implementations may provide a computer-implemented method for validating a digital document, the method including: receiving, at a computing device, the digital document comprising at least two digital watermarks, the digital document issued by a central entity; retrieving a first digital watermark from the digital document, the first digital watermark visually presented at a first time point; retrieving a second digital watermark from the digital document, the second digital watermark visually presented at a second time point, the second digital watermark being different from the first digital watermark and the second time point being different from the first time point; and reading the digital document based on the retrieved first and second digital watermarks.