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A new RGB image encryption algorithm based on hyper-chaotic-discrete-wavelet-packet-transform
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DOI：10.1007/s11042-023-17812-6.png)
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摘要
En 中文
The paper proposes a new hyper-chaotic-discrete-wavelet-packet-transform encryption algorithm for RGB images. The highlight is that the 512-bit hash of timestamp is used to get the initial values of the 4D hyper-chaotic system. The sequences generated by the 4D Lorenz system are used to construct 12 keys for encryption. The proposed encryption algorithm uses a newly designed 3D chaotic diffusion and inter-shuffling of pixels followed by 2D diffusion to improve security levels. The obtained images will go through another deep level of diffusion and shuffling in approximation coefficients (where most of the information is stored) after applying discrete wavelet packet transform at the desired level with a wavelet name selected by users. This step resists commonly well-known attacks such as differential, noise, and crop attacks. After that, modified approximation coefficients and other remaining coefficients, namely horizontal, vertical, and diagonal coefficients, are reverted back using the inverse wavelet packet transform. In the end, another layer of chaotic diffusion and row-column matrix shuffling is performed to avoid high redundancy and correlation in the encrypted image. The main advantage of using the hyper-chaotic system in the encryption process is that it gives a vast key space to make brute-force attacks infeasible and provides excellent speed to the proposed algorithm. The randomness of the encrypted image has been verified using the NIST SP800-22 statistical test suite. Several well-known attacks have been used to validate the algorithm's robustness. The proposed technique has been compared with other existing algorithms, and the data (presented in tables) confirm that the proposed algorithm is competitive and can be used for practical purposes. Finally, a conclusion, including a future scope, has been provided.
Keyword:
Hyper-chaotic system
Discrete wavelet packet transform
2D and 3D chaotic diffusion
Encryption
Decryption
期刊
IF:
3
论文数:
2.0W
被引数:
3.2W
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