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HCSS-GB and IBESS: Secret Image Sharing Schemes with Enhanced Shadow Management and Visual-Gradient Access Control.

Huanrong Pan1,2, Wei Yan1,2, Rui Wang1,2

  • 1College of Electronic Engineering, National University of Defense Technology, Hefei 230037, China.

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|September 27, 2025
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Summary
This summary is machine-generated.

Two new secret image sharing (SIS) schemes, HCSS-GB and IBESS, enhance security and efficiency for sensitive image data. These methods address storage limitations and real-time needs, offering lossless recovery and improved shadow management.

Keywords:
Gaussian blurShamir secret sharingbit expansionefficient storage managementhierarchical access controlsecret image sharing

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Area of Science:

  • Computer Science
  • Information Security
  • Image Processing

Background:

  • Existing secret image sharing (SIS) schemes face limitations in privacy-sensitive domains like healthcare and military.
  • These limitations include complex shadow management, inadequate access control, and poor storage-speed trade-offs, hindering practical application.

Purpose of the Study:

  • To propose two novel SIS schemes, HCSS-GB and IBESS, to overcome the limitations of current methods.
  • To provide efficient and secure image protection solutions for diverse application scenarios.

Main Methods:

  • HCSS-GB: Utilizes Gaussian blur and Shamir's secret sharing for controllable sharing and meaningful shadow images without pixel expansion, ideal for limited storage.
  • IBESS: Employs bit expansion for real-time applications, combining shadow image bits with blurred carrier images for enhanced efficiency, despite increased storage.

Main Results:

  • Both HCSS-GB and IBESS achieve lossless image recovery (PSNR=∞, MSE=0, SSIM=1).
  • HCSS-GB offers a 1:1 storage ratio, suitable for storage-constrained environments.
  • IBESS demonstrates high efficiency, with sharing times as low as 2.1s for (7,8) threshold, ideal for real-time tasks.

Conclusions:

  • The proposed HCSS-GB and IBESS schemes offer effective solutions for secure image sharing and efficient shadow management.
  • Carrier image properties like contrast and sharpness significantly improve shadow distinguishability and hierarchical access control effectiveness.
  • Experimental validation confirms the reliability, efficiency, and practicality of both proposed SIS schemes.