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Cryptanalysis of a New Chaotic Image Encryption Technique Based on Multiple Discrete Dynamical Maps.

Haiju Fan^1,2,3,4, Chenjiu Zhang^1,2,3,4, Heng Lu^1,2,3,4

¹College of Computer and Information Engineering, Henan Normal University, Xinxiang 453007, China.

Entropy (Basel, Switzerland)

|December 24, 2021

Summary

This summary is machine-generated.

A new chaotic image encryption method is insecure due to its simple structure. Cryptanalysis reveals vulnerabilities, allowing chosen-plaintext attacks to break the system efficiently, compromising digital image privacy.

Keywords:

chosen-plaintext attack cryptanalysis image encryption multiple dynamic maps permutation–diffusion structure

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Area of Science:

Cryptography
Image Processing
Applied Mathematics

Background:

A novel chaotic image encryption technique using multiple discrete dynamic maps was recently proposed.
The technique claims to offer excellent privacy for digital images.

Purpose of the Study:

To perform cryptanalysis on the proposed chaotic image encryption technique.
To demonstrate the vulnerabilities of the encryption scheme through chosen-plaintext attacks.
To propose efficient methods for breaking the cryptosystem.

Main Methods:

Cryptanalysis of the one-round permutation-diffusion structure.
Development of two distinct chosen-plaintext attack strategies.
Simulation and validation of the attack effectiveness.

Main Results:

Identified a lack of strong correlation between the encryption key and the plain image.
Demonstrated that the cryptosystem collapses due to this weakness.
Showcased two chosen-plaintext attacks requiring only 3 and 258 image pairs to break the system.

Conclusions:

The proposed chaotic image encryption technique is insecure and vulnerable to chosen-plaintext attacks.
The simplified structure, while reducing computational cost, compromises the overall security.
The developed attack methods effectively break the encryption system, highlighting the need for more robust techniques.