School of Information Technology and Management, Hunan University of Finance and Economics, Changsha, China.
Zhongshan Institute, University of Electronic Science and Technology of China, Zhongshan, China.
PLoS One. 2024 Aug 27;19(8):e0300228. doi: 10.1371/journal.pone.0300228. eCollection 2024.
In response to the vulnerability of image encryption techniques to chosen plaintext attacks, this paper proposes a secure image communication scheme based on two-layer dynamic feedback encryption and discrete wavelet transform (DWT) information hiding. The proposed scheme employs a plaintext correlation and intermediate ciphertext feedback mechanism, and combines chaotic systems, bit-level permutation, bilateral diffusion, and dynamic confusion to ensure the security and confidentiality of transmitted images. Firstly, a dynamically chaotic encryption sequence associated with a secure plaintext hash value is generated and utilized for the first round of bit-level permutation, bilateral diffusion, and dynamic confusion, resulting in an intermediate ciphertext image. Similarly, the characteristic values of the intermediate ciphertext image are used to generate dynamically chaotic encryption sequences associated with them. These sequences are then employed for the second round of bit-level permutation, bilateral diffusion, and dynamic confusion to gain the final ciphertext image. The ciphertext image hidden by DWT also provides efficient encryption, higher level of security and robustness to attacks. This technology offers indiscernible secret data insertion, rendering it challenging for assailants to spot or extract concealed information. By combining the proposed dynamic closed-loop feedback secure image encryption scheme based on the 2D-SLMM chaotic system with DWT-based hiding, a comprehensive and robust image encryption approach can be achieved. According to the results of theoretical research and experimental simulation, our encryption scheme has dynamic encryption effect and reliable security performance. The scheme is highly sensitive to key and plaintext, and can effectively resist various common encryption attacks and maintain good robustness. Therefore, our proposed encryption algorithm is an ideal digital image privacy protection technology, which has a wide range of practical application prospects.
针对图像加密技术对选择明文攻击的脆弱性，本文提出了一种基于两层动态反馈加密和离散小波变换(DWT)信息隐藏的安全图像通信方案。该方案采用明文相关和中间密文反馈机制，结合混沌系统、位级置换、双边扩散和动态混淆，确保传输图像的安全性和保密性。首先，生成一个与安全明文哈希值相关的动态混沌加密序列，并将其用于第一轮位级置换、双边扩散和动态混淆，生成中间密文图像。同样，使用中间密文图像的特征值生成与之相关的动态混沌加密序列。然后，这些序列用于第二轮位级置换、双边扩散和动态混淆，以获得最终的密文图像。DWT 隐藏的密文图像也提供了高效的加密，更高的安全级别和对攻击的鲁棒性。这项技术提供了不可见的秘密数据插入，使得攻击者难以发现或提取隐藏的信息。通过将基于 2D-SLMM 混沌系统的动态闭环反馈安全图像加密方案与基于 DWT 的隐藏技术相结合，我们可以实现一种全面而强大的图像加密方法。根据理论研究和实验模拟的结果，我们的加密方案具有动态加密效果和可靠的安全性能。该方案对密钥和明文高度敏感，能够有效抵抗各种常见的加密攻击，并保持良好的鲁棒性。因此，我们提出的加密算法是一种理想的数字图像隐私保护技术，具有广泛的实际应用前景。
