抗明文攻击的动态DNA编码数字图像加密算法
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引用本文:黄湧,雷通.抗明文攻击的动态DNA编码数字图像加密算法[J].计算技术与自动化,2024,(2):138-144
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作者单位
黄湧,雷通 (中国能源建设集团 广东省电力设计研究院有限公司广东 广州 510000) 
中文摘要:针对传统图像加密算法易受明文攻击的问题,提出了结合DNA动态编码和离散混沌系统的数字图像加密算法。首先,选取动力学特性复杂且计算复杂度低的离散混沌系统,为图像密码系统提供优质熵源。接着,设计明文相关机制生成混沌加密序列以抵御选择明文攻击。然后,利用混沌序列对图像比特平面置乱,并依次进行DNA编码、混淆和解码的操作。最后,执行比特平面混淆以获得最终的密文。理论分析和实验结果表明,本文的图像加密算法具有密钥空间大、相邻像素相关性强、直方图统计特性优良等特性,该算法在抵抗明文攻击时的鲁棒性。
中文关键词:DNA编码  图像加密  混沌系统
 
Dynamic DNA-encoded Digital Image Encryption Algorithm Against Plaintext Attacks
Abstract:Aiming at the problem that traditional image encryption algorithms are susceptible to plaintext attacks, this paper proposes a digital image encryption algorithm that combines DNA dynamic coding and discrete chaotic system. Firstly, a discrete chaotic system with complex dynamics and low computational complexity is selected to provide a high-quality entropy source for the image cryptosystem. Next, a plaintext correlation mechanism is designed to generate chaotic encryption sequences to defend against selected plaintext attacks. Then, the chaotic sequence is used to disrupt the image bit plane and perform the operations of DNA encoding, obfuscation and decoding sequentially. Finally, bit-plane obfuscation is performed to obtain the final ciphertext. Theoretical analyses and experimental results show that the image encryption algorithm in this paper has the properties of large key space, strong correlation between adjacent pixels, and excellent statistical properties of histogram, the algorithm has the ability of robustly resisting plaintext attacks.
keywords:DNA coding  image encryption  chaos system
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