Photochromic Document Security Feature for Remote Verification

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Solution Overview

Problem

Existing methods for verifying the authenticity of security features on documents, such as ID cards, via electronic visual channels are unreliable due to poor transmission quality and susceptibility to manipulation, especially when no technical aids are available.

Innovation Solution

A method utilizing a photochromic security feature, like bacteriorhodopsin, which changes color when stimulated by specific light wavelengths, allowing for remote authentication by recording and transmitting images of the feature's color changes, with a service provider controlling the light emission and pattern display to verify authenticity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If optical security features are checked via electronic visual channel using webcam, then remote verification is enabled, but transmission quality deteriorates and manipulation becomes easier

Engineering Contradiction:

Improveremote verification capabilityVSAvoidauthenticity verification reliability

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent applies photochromic security features that change color when exposed to specific wavelengths of light. A challenge-response mechanism is implemented where the service provider sends a specific light pattern (challenge) and the document's photochromic feature responds with a color change (response). This dynamic color transformation cannot be captured in static counterfeit images, enabling reliable remote verification despite poor transmission quality.

Inventive Principle:

Principle #32Color changes

Solution Approach 2:

The verification process uses periodic light stimulation at specific wavelengths to trigger reversible color changes in the photochromic material. The service provider controls the timing and duration of light exposure, creating a time-dependent verification sequence that distinguishes authentic documents from static forgeries.

Inventive Principle:

Principle #19Periodic action

2Ease of operation

If static holographic features are used for verification, then visual checking is simple, but counterfeits can be easily procured and manipulated

Engineering Contradiction:

Improvevisual checking simplicityVSAvoidsusceptibility to counterfeiting

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The patent transforms static holographic features into dynamic photochromic elements that respond to light stimulation. The security feature transitions from a fixed state to a dynamically changing state based on external light input, making it impossible to replicate with static counterfeit images while maintaining visual simplicity for the user.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The photochromic material changes its optical parameters (color, absorption spectrum) in response to specific wavelength stimulation. This parameter change is controlled and reversible, providing a verifiable response that cannot be reproduced by counterfeiters who only have access to the document's appearance under normal lighting conditions.

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If user-controlled reading device is used for verification, then accessibility is improved, but security against internal attacks deteriorates

Engineering Contradiction:

Improveverification accessibilityVSAvoidprotection against internal attacks

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The system implements a challenge-response feedback mechanism where the service provider controls the light stimulation parameters and verifies the resulting color change response. This feedback loop ensures that even though the user controls the reading device, the verification process remains secure because the service provider dictates the verification conditions and validates the response against expected outcomes.

Inventive Principle:

Principle #23Feedback

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 method provides a reliable and user-friendly means to authenticate security features, resistant to manipulation and internal attacks, by using a reversible color-changing material that can be securely verified through image processing, enhancing the security of remote identity verification processes.

Implementation Method 1

the security feature changes its color when stimulated by light of a specific wavelength and changes its original color after the stimulation has ceased

Methodology Applied

Scientific EffectPhotochromism: Photochromism

Data Source

PatentEP3035301B1Method for checking authenticity of a document with a photochromic secuirity feature

Publication Date: 2022.02.09 GIESECKE & DEVRIENT EPAYMENTS GMBH

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AI summary

The present invention discloses a method for verifying the authenticity of a user's document 4, wherein the document 4 has a security feature, wherein the security feature changes its color when excited by light of a certain wavelength and returns to its original color after excitation, wherein at least one image of the security feature is taken by means of a camera 10 and the image is transmitted to a service provider for verifying the authenticity of the security feature.