A New Algorithm for Digital Image Encryption Based on Chaos Theory.

Yaghoub Pourasad,Abbas Mardani,Ramin Ranjbarzadeh

doi:10.3390/e23030341

Yaghoub Pourasad, Abbas Mardani + Show 1 more

Open Access

https://doi.org/10.3390/e23030341

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Abstract

In recent decades, image encryption, as one of the significant information security fields, has attracted many researchers and scientists. However, several studies have been performed with different methods, and novel and useful algorithms have been suggested to improve secure image encryption schemes. Nowadays, chaotic methods have been found in diverse fields, such as the design of cryptosystems and image encryption. Chaotic methods-based digital image encryptions are a novel image encryption method. This technique uses random chaos sequences for encrypting images, and it is a highly-secured and fast method for image encryption. Limited accuracy is one of the disadvantages of this technique. This paper researches the chaos sequence and wavelet transform value to find gaps. Thus, a novel technique was proposed for digital image encryption and improved previous algorithms. The technique is run in MATLAB, and a comparison is made in terms of various performance metrics such as the Number of Pixels Change Rate (NPCR), Peak Signal to Noise Ratio (PSNR), Correlation coefficient, and Unified Average Changing Intensity (UACI). The simulation and theoretical analysis indicate the proposed scheme’s effectiveness and show that this technique is a suitable choice for actual image encryption.

Highlights

In recent years, image encryption has been an attractive area for research
Different methods representing digital image encryption in studies are connected to the ever-increasing necessity of security
Image encryption based on the chaos method is a novel encryption method for images where a random chaos sequence is applied for encrypting the image as an effective way for solving the intractable problems of highly secure and fast image encryption

Summary

Introduction

Image encryption has been an attractive area for research. It is extensively recognized as a useful technique for secure transmission. Digital communication has become broader by the fast development of Internet technology [3,4]. People can send a digital image on the Internet anytime and anywhere [5,6]. This has resulted in the development of digital image encryption. Different methods representing digital image encryption in studies are connected to the ever-increasing necessity of security. Four approaches have been adopted for image encryption, applying various principles individually and achieving the same objectives. The four principles include sharing and secret segmentation, sequential permutation, chaotic dynamical systems, and modern cryptography, each with unique features [7,8,9,10,11,12,13]

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