Abstract
In order to improve the security and efficiency of image encryption, many researchers have continuously proposed new image encryption schemes in recent years. However, these image encryption schemes have not been fully analyzed and evaluated. In this paper, a newly reported image encryption scheme based on Feistel network and dynamic Deoxyribonucleic Acid (DNA) encoding is deeply and comprehensively investigated. This encryption scheme mainly adopts four encryption steps to encrypt the plain image, which are Generation of chaotic sequences, Hill encryption, Feistel network, and Pixel diffusion. Our analyses show that there are some problems in the secret key design and encryption process of this encryption scheme. After pointing out and analyzing these problems, we have made several necessary improvements to this encryption scheme and proposed the corresponding chosen-plaintext attack algorithm. The subsequent simulation tests and analyses have confirmed the effectiveness and feasibility of the proposed attack algorithm. Finally, for the problems in this encryption scheme and some current image encryption schemes, improvement suggestions are presented to provide references for the designers of future image encryption schemes.
Highlights
N OWADAYS, digital images are widely used because they can convey information vividly and intuitively
For an image encryption scheme based on a discrete chaotic map and Deoxyribonucleic Acid (DNA) encoding, Chen et al [56] simplified it to a substitution and permutation structure, and broke it by a chosenplaintext attack algorithm
In this paper, an Image Encryption Scheme based on Feistel network and Dynamic DNA encoding (IES-FD) is comprehensively analyzed and evaluated, and the security, feasibility and practicality problems in it are pointed out and discussed
Summary
N OWADAYS, digital images are widely used because they can convey information vividly and intuitively. In [43], a chaotic image encryption scheme based on Galois fields was presented This scheme first uses matrix multiplication operations to diffuse the plain image, and scrambles the pixels through two chaotic maps. For an image encryption scheme based on a discrete chaotic map and DNA encoding, Chen et al [56] simplified it to a substitution and permutation structure, and broke it by a chosenplaintext attack algorithm. In this paper, an Image Encryption Scheme based on Feistel network and Dynamic DNA encoding (IES-FD) is comprehensively analyzed and evaluated, and the security, feasibility and practicality problems in it are pointed out and discussed.
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