Smart Terminal Visual Cryptography Authentication with Automated Image Calibration

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Solution Overview

Problem

Existing visual cryptography authentication systems require manual calibration of images on different-sized monitors, which can lead to unclear decryption images and increased risk of exposure and loss of encrypted data.

Innovation Solution

An authentication method and apparatus using visual cryptography on smart terminals, where a key image is pre-stored and an encrypted image is captured and converted to match in size and shape for overlay, enabling automated image calibration and secure decryption without manual adjustment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If manual calibration process is performed to adjust image size on different monitors, then decryption accuracy can be improved, but device complexity and ease of operation deteriorate

Engineering Contradiction:
Improvedecryption accuracyVSAvoidcalibration process complexity
Core Design Contradiction:
Measurement precisionVSDevice complexity

Solution Approach 1:

The system performs automatic calibration where the smart terminal autonomously captures the encrypted image, detects its dimensions, scales it to match the key image, and overlays them without requiring manual user intervention. The calibration process is self-executing through automated image processing algorithms.

Inventive Principle:
Principle #25Self-service

Solution Approach 2:

The manual mechanical calibration process is replaced with an automated digital image processing system. The terminal uses software-based image capture, scaling, and overlay operations instead of manual physical adjustment, eliminating the need for users to perform complex calibration tasks.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

2Measurement precision

If manual calibration process is performed to adjust image size on different monitors, then decryption accuracy can be improved, but ease of operation worsens

Engineering Contradiction:
Improvedecryption accuracyVSAvoiduser operation simplicity
Core Design Contradiction:
Measurement precisionVSEase of operation

Solution Approach 1:

The system performs automatic calibration where the smart terminal autonomously captures the encrypted image, detects its dimensions, scales it to match the key image, and overlays them without requiring manual user intervention. The calibration process is self-executing through automated image processing algorithms.

Inventive Principle:
Principle #25Self-service

Solution Approach 2:

The manual mechanical calibration process is replaced with an automated digital image processing system. The terminal uses software-based image capture, scaling, and overlay operations instead of manual physical adjustment, eliminating the need for users to perform complex calibration tasks.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

3Ease of operation

If encrypted image is displayed on different-sized monitors without calibration, then ease of operation is improved, but manufacturing precision deteriorates

Engineering Contradiction:
Improveauthentication process simplicityVSAvoidimage alignment precision
Core Design Contradiction:
Ease of operationVSManufacturing precision

Solution Approach 1:

The system performs preliminary calibration by capturing the encrypted image, detecting its actual display dimensions, and pre-scaling it to match the key image size before overlay. This preparatory scaling ensures precise alignment is achieved automatically, eliminating the need for manual adjustment during authentication.

Inventive Principle:
Principle #10Preliminary action

4Adaptability or versatility

If manual calibration is required for different monitor sizes, then adaptability worsens, but device complexity increases

Engineering Contradiction:
Improvemonitor size compatibilityVSAvoidcalibration system complexity
Core Design Contradiction:
Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The authentication system is designed to universally work across different monitor sizes and resolutions. The automatic calibration mechanism adapts to any display device by dynamically detecting and scaling the encrypted image to match the key image, making the system compatible with various screen configurations without requiring device-specific calibration procedures.

Inventive Principle:
Principle #6Universality (Multi-functionality)

Data Source

PatentUS11057214B2Authentication apparatus using visual cryptography and method thereof
Publication Date: 2021.07.06 TOBESMART CO LTD
  • US11057214B2 patent drawing
  • US11057214B2 patent drawing
  • US11057214B2 patent drawing

AI summary

An authentication method using visual cryptography in a smart terminal, including: receiving, from an authentication server, a key image in which a user's individual cryptography string generated by the authentication server is separated; requesting user authentication from the authentication server; after requesting the user authentication, receiving, from a camera, an encrypted image shown on a display device; extracting an encrypted area from the received encrypted image; converting the extracted encrypted area to match with the key image in size and shape and overlaying the encrypted area with the key image pre-stored in the smart terminal; displaying an authentication code shown in an area where the encrypted area is overlaid with the key image and receiving the authentication code to transmit the authentication code to the authentication server; and after transmitting the authentication code, receiving an authentication result from the authentication server to provide the authentication result to the user.