Document Security Marks Superimposition for Anti-Forgery
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Solution Overview
Problem
Existing methods for securing documents, particularly those with watermarks, have become vulnerable to forgery as techniques for producing and simulating watermarks have become more accessible, making it difficult to distinguish authentic from counterfeit documents.
Innovation Solution
A method involving the formation of two marks on different surfaces or depths of a document, where at least one mark has an error rate greater than a predefined value when copied, increasing the difficulty for forgers to replicate the document accurately and allowing for improved detection of authenticity through superimposed images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single watermark is used to secure documents, then the security level is improved, but the complexity of detection and authentication increases
Solution Approach 1:
The security mark is divided into two separate components: a first mark applied to the front surface and a second mark applied to the back surface. Each mark contains partial information and can be independently verified, reducing the complexity of authentication while maintaining high security through the combined verification of both marks.
2Ease of manufacture
If watermark production techniques become more accessible, then manufacturing cost is reduced, but the vulnerability to forgery increases
Solution Approach 1:
The first and second marks are designed with asymmetric characteristics - they have different structures, patterns, or information content that are specifically correlated to each other. This asymmetry makes it difficult for forgers to reproduce both marks correctly even if they can produce watermark-like effects, as the specific asymmetric relationship between the two marks is difficult to replicate without access to the original document's security features.
3Measurement precision
If machine-readable information is inserted into the watermark, then authentication capability is improved, but the device complexity increases
Solution Approach 1:
The authentication system transitions from analyzing a single two-dimensional watermark to analyzing the spatial relationship between two marks on different surfaces (front and back of the document). This adds a dimensional aspect to authentication - the correlation between marks across the document's thickness - which provides enhanced security verification without requiring complex embedding of machine-readable information within each individual mark.
Data Source
AI summary
A document securization method includes:a first step of forming a first mark (205, 210) on a first surface of a document by utilizing a first marking element,a second step of forming a second mark (215) on another surface of the document or in the depth of the document by utilizing a second marking element,the two marks are superimposed when the document is illuminated by back-lighting andat least one (215) of the marks is a mark whose copy, made using marking elements identical to those utilized for forming the mark, causes an error rate, measured dot by dot, that is greater than a predefined value.