Tear-off Film for Irreversible Security on Multi-layer Substrates
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Solution Overview
Problem
Existing solutions for securing hidden information on value documents, such as crypto wallets and banknotes, can be fraudulently restored or reused, allowing unauthorized access and resale, as they often rely on reversible alterations like scratching or peeling that can be reversed.
Innovation Solution
A multilayer substrate with a thermoplastic polymeric layer and a strip-shaped tear film embedded between paper plies, where hidden information is irreversibly exposed by tearing the tear film, ensuring the document cannot be restored to its original state once manipulated.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an opaque coating or sticker is used to hide information, then the information is protected from unauthorized access, but the document can be fraudulently restored or reused by replacing the coating or sticker
Solution Approach 1:
The patent extracts the hidden information from the document body and places it on a separate tear-off strip. This strip is initially attached to the document but can be cleanly separated. The information remains on the strip after separation, allowing the document to be returned to its original appearance while the information is securely retained on the detached strip, preventing fraudulent restoration
Solution Approach 2:
The patent divides the document into two functional segments: the main document body and a separate tear-off strip containing the hidden information. This segmentation allows the information-carrying portion to be physically separated from the document, enabling detection of unauthorized access while maintaining document integrity and preventing reuse
2Ease of operation
If a scratchable opaque layer is used, then the information can be exposed by scratching, but the layer can be restored or replaced to allow fraudulent reuse
Solution Approach 1:
The patent extracts the hidden information from the document body and places it on a separate tear-off strip. This strip is initially attached to the document but can be cleanly separated. The information remains on the strip after separation, allowing the document to be returned to its original appearance while the information is securely retained on the detached strip, preventing fraudulent restoration
Solution Approach 2:
The patent prepares the tear-off strip with hidden information and attaches it to the document in advance. The strip includes features that facilitate clean separation and provide visual indication of tampering. This preliminary preparation ensures that when the strip is removed, the document is left in its original state with clear evidence of the removal, preventing fraudulent reuse
3Ease of operation
If folded document halves are used to hide information, then the information is protected until separation, but the document can be resealed to allow fraudulent reuse
Solution Approach 1:
The patent extracts the hidden information from the document body and places it on a separate tear-off strip. This strip is initially attached to the document but can be cleanly separated. The information remains on the strip after separation, allowing the document to be returned to its original appearance while the information is securely retained on the detached strip, preventing fraudulent restoration
Solution Approach 2:
The patent incorporates visual indicators that change or reveal themselves upon unauthorized access. The tear-off strip includes features such as colored inks or patterns that provide clear visual evidence when removed or tampered with, making fraudulent restoration detectable through visual inspection
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach provides a high level of security by ensuring that hidden information, like private keys, can only be accessed through irreversible destruction, preventing fraudulent restoration and reuse, while public information remains accessible without altering the document.
Implementation Method 1
a plastic layer arranged between the paper plies and directly bonded to the paper plies on both sides which is made of at least one thermoplastic polymeric material
Data Source
AI summary
A security paper, having a first paper ply and a second paper ply, and a plastic ply made of a thermoplastic polymer material arranged between the paper layers (1, 2), wherein a strip-shaped tear-off film is embedded between the paper layers on the inner side of the second paper layer and at least partially embedded into the plastic layer. Hidden information is arranged on the inner side of the first paper ply and is covered by the strip-shaped tear-off film or is arranged on the surface of the strip-shaped tear-off film facing the first paper ply. The hidden information can be exposed by the strip-shaped tear-off film together with a strip of the second paper ply being irreversibly torn off the multi-layer substrate.