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Improved Cryptanalysis and Enhancements of an Image Encryption Scheme Using Combined 1D Chaotic Maps.

Congxu Zhu1,2,3, Guojun Wang2, Kehui Sun4

  • 1School of Information Science and Engineering, Central South University, Changsha 410083, China.

Entropy (Basel, Switzerland)
|December 3, 2020
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Summary
This summary is machine-generated.

This study enhances chaos-based image encryption by improving cryptanalysis. An improved scheme, using image content for diffusion, significantly boosts security against chosen-plaintext attacks.

Keywords:
chaotic cryptographychosen-plaintext attackcryptanalysisimage encryptionimage information entropy

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Area of Science:

  • Cryptography
  • Image Processing
  • Computer Science

Background:

  • Chaos-based image encryption schemes integrate permutation, diffusion, and linear transformations.
  • Existing schemes may have vulnerabilities exploitable through cryptanalysis.

Purpose of the Study:

  • To present an improved cryptanalysis of a specific chaos-based image encryption scheme.
  • To develop a more secure enhanced color image encryption scheme.

Main Methods:

  • A chosen-plaintext attack algorithm was employed for cryptanalysis.
  • The improved scheme incorporates an image content-related approach for diffusion arrays.
  • Diffusion and confusion processes are interwoven for enhanced security.

Main Results:

  • The equivalent key streams and unknown parameters of the original cryptosystem were recovered.
  • The improved scheme demonstrated enhanced security against attacks.
  • Theoretical analysis and experimental validation confirmed the findings.

Conclusions:

  • The original chaos-based image encryption scheme has exploitable weaknesses.
  • The improved scheme offers superior security and is validated through rigorous analysis and experiments.