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A new color image encryption scheme using CML and a fractional-order chaotic system
Xiangjun Wu1, Yang Li2, Jürgen Kurths3
1College of Software, Henan University, Kaifeng, China; Potsdam Institute for Climate Impact Research (PIK), Potsdam, Germany; Department of Physics, Humboldt University zu Berlin, Berlin, Germany.
Plos One
|April 1, 2015
Summary
This study introduces a novel color image encryption algorithm using coupled-map lattices (CML) and fractional-order chaos. The method enhances security and robustness for practical, real-time image transmission.
Area of Science:
- Cryptography
- Information Security
- Applied Mathematics
Background:
- Chaos-based image cryptosystems are crucial for real-time encryption and transmission.
- Existing methods require enhanced security and robustness.
Purpose of the Study:
- To propose a novel color image encryption algorithm using coupled-map lattices (CML) and a fractional-order chaotic system.
- To improve the security and robustness of image encryption.
Main Methods:
- A permutation-diffusion structure with an image division-shuffling process.
- Utilizing coupled-map lattices (CML) and a fractional-order chaotic system.
- Employing a 280-bit external secret key for initial conditions and parameters.
Main Results:
- The proposed algorithm demonstrates high security through extensive statistical, entropy, differential, and key sensitivity analyses.
- The cryptosystem achieves fast encryption speeds suitable for practical applications.
- The method shows good robustness against noise, cropping, JPEG compression, rotation, and brightness adjustments.
Conclusions:
- The novel algorithm offers superior security and speed compared to existing schemes.
- The image encryption technique exhibits strong resilience against common image processing operations and geometric attacks.
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