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A flexible and visually meaningful multi-image compression, encryption and hiding scheme based on 2D compressive

Dongming Huo1, Zhilong Zhu1, Xin Zhou2

  • 1Key Laboratory of Advanced Perception and Intelligent Control of High-End Equipment, Ministry of Education, College of Electrical Engineering, Anhui Polytechnic University, Wuhu 241000, China.

Heliyon
|March 14, 2023
PubMed
Summary

This study introduces a visually secure multi-image encryption scheme using 2D compressive sensing. It encrypts multiple images into a single, meaningful cipher image without increasing data size, enhancing security and capacity.

Keywords:
Compressive sensingMulti-image encryptionVisually meaningful cipher image

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Area of Science:

  • Computer Science
  • Information Security
  • Digital Image Processing

Background:

  • Traditional image encryption produces noise-like images, attracting unwanted attention and cryptanalysis.
  • Visually meaningful image encryption offers enhanced security by disguising encrypted data as normal images.

Purpose of the Study:

  • To propose a flexible visually secure multi-image compression, encryption, and hiding scheme.
  • To increase information capacity and visual security of cipher images.
  • To achieve compression and encryption of multiple images without increasing ciphertext data.

Main Methods:

  • The scheme involves an encryption process using scrambling, non-linear transformation, and 2D compressive sensing (2DCS).
  • Multiple secret images are generated from plain images via 2DCS.
  • An embedding process utilizes integer wavelet transform and bit-plane decomposition to hide secret images within a host image's coefficients.

Main Results:

  • The proposed scheme successfully encrypts multiple images into a single, visually meaningful cipher image.
  • The method allows flexible adjustment of encryption capacity and visual security.
  • Simulation experiments confirmed the feasibility and effectiveness of the visually meaningful multi-image encryption scheme.

Conclusions:

  • The developed scheme provides a novel approach to visually secure multi-image encryption and hiding.
  • It offers a flexible solution for balancing information capacity and visual security in image encryption.
  • The technique enhances the security of digital images in public networks by creating visually meaningful cipher images.