Security Document Text Printing Strikethrough Forgery Detection
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Solution Overview
Problem
Security documents face challenges in preventing forgery and tampering, particularly through the re-arrangement of characters, which can be difficult to detect visually or by machines.
Innovation Solution
Incorporating a strikethrough path through characters in a word, where the path's alignment is specific to the original document, making re-arrangement evident by misalignment, thus inhibiting tampering or forgery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If characters are printed in a standard font without additional security features, then the document is easy to reproduce and manipulate, but it becomes vulnerable to forgery and tampering through character re-arrangement
Solution Approach 1:
The strikethrough path is pre-configured during the original printing process to pass through specific portions of each character in a specific sequence. This preliminary action creates a built-in verification mechanism that will automatically reveal tampering, as any re-arranged characters will misalign with the predetermined path without requiring additional verification steps
Solution Approach 2:
The strikethrough path creates local variations in the visual appearance of characters by passing through specific portions (e.g., middle of 'E', top of 'T'). Each character position has a unique local quality defined by which portion is struck through, making the security feature integrated into the character structure itself rather than as a separate overlay
2Measurement precision
If a strikethrough path is added to prevent character re-arrangement, then forgery detection capability improves, but the printing process becomes more complex
Solution Approach 1:
The strikethrough path is merged with the character printing process itself, being applied in the same printing pass that forms the characters. This integration means the security feature and the text content are created simultaneously in a single printing operation, avoiding the need for separate verification equipment or multi-step processes
Solution Approach 2:
The strikethrough path creates asymmetric visual patterns through characters based on their position and identity in the sequence. Each character position has a unique asymmetric strike-through pattern that cannot be replicated by simple character re-arrangement, providing precise tampering detection through the resulting misalignment
3Reliability
If characters are excised and re-arranged to forge a document, then the forgery becomes undetectable by simple visual inspection, but the strikethrough path reveals misalignment
Solution Approach 1:
The strikethrough path provides immediate visual feedback about the integrity of the character sequence. When characters are re-arranged, the feedback mechanism automatically reveals the tampering through misalignment of the strike-through portions, making detection as simple as visual inspection without requiring complex measurement equipment
Data Source
AI summary
Printing or engraving or other techniques and resulting security documents can help inhibit or prevent tampering or forgery, such as by providing a strikethrough path through characters in a word. A characteristic of the strikethrough path can depend upon a characteristic of the word. For example, the strikethrough path can alternatingly ascend and descend through successive words in a sequence, such that the location of the strikethrough path within a particular character depends on that particular character, upon a location of the character within the word, or both. The strikethrough path can be constructed such that if characters are copied or excised and re-arranged, such re-arrangement is evident by misalignment of one or more portions of the strikethrough path that would otherwise be aligned in the original document.