Abstract
To better protect the image information, an image encryption algorithm based on block scrambling and finite state machine is proposed. The method uses discrete wavelet transform (DWT) to divide the original image into four frequency bands. Secondly, chaotic sequences and zigzag scanning curve are used to construct a scrambling matrix to scramble the four frequency bands. Then combine the chaotic sequence, DNA coding, and automata to transform the state of the scrambled image. Finally, the key stream is used to diffuse the sequence to improve the security of cipher images further. Experimental results and security analysis show that the proposed encryption scheme can resist various attacks and ensure the secure transmission of images.
Highlights
With the development of communication technology, information security has been paid more and more attention
Luo [5] proposed an image encryption algorithm that uses two-dimensional discrete wavelet transform and chaotic system to carry out adaptive replacement of pixels
To solve the above problems, this paper proposes a hyperchaotic image encryption algorithm based on block scrambling and finite automata machine
Summary
With the development of communication technology, information security has been paid more and more attention. Luo [5] proposed an image encryption algorithm that uses two-dimensional discrete wavelet transform and chaotic system to carry out adaptive replacement of pixels. This method enhances encrypted images' security, but Logistic mapping's encryption structure is often relatively simple and has weak resistance to violent attacks and statistical analysis attacks [6]. The diffusion process is generally to perform bit XOR between the encrypted image and the generated chaotic sequence to change the image pixels. Wu [25] applied it to color image encryption, and diffusion between image pixels is carried out by combining DNA addition, subtraction, and XOR operations
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