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Fast Encryption Algorithm Based on Chaotic System and Cyclic Shift in Integer Wavelet Domain
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DOI：10.3390/fractalfract8020075.png)
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This paper introduces a new fast image encryption scheme based on a chaotic system and cyclic shift in the integer wavelet domain. In order to increase the effectiveness and security of encryption, we propose a new diffusion scheme by using bidirectional diffusion and cyclic shift and apply it to our encryption scheme. First, a two-level integer wavelet transform is used to split the plaintext picture into four low-frequency components. Second, we use random sequences generated by Chen's hyper-chaotic system to scramble four low-frequency components. The initial value is determined by Secure Hash Algorithm 256-bit (SHA256) and user-defined parameters, which increases the plaintext sensitivity. Then, the new diffusion scheme is applied to the matrix containing most of the information and matrices are transformed by a one-level inverse integer wavelet. Finally, to create the ciphertext image, the diffused matrices are subjected to the one-level inverse integer wavelet transform. In the simulation part, we examine the suggested algorithm's encryption impact. The findings demonstrate that the suggested technique has a sufficient key space and can successfully fend off common attacks.
Keyword:
image encryption
integer wavelet transform
Chen's hyper-chaotic map
cyclic shift
期刊
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3.3
论文数:
4.4K
被引数:
7.6K
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