基于DNA置乱和光混沌医学多CT图像加密算法研究

Research on Medicine Multi-CT Image Encryption Algorithm Based on DNA Shuffling and Optical Chaos

摘要:

针对现有的基于比特置乱和图像重组的多图像加密算法存在置乱期间算法时间过长和加密复杂度低的不足，本文提出了一种基于比特置乱和图像DNA(Deoxyribonucleic acid)重组的医学多CT（Computed Tomography）图像加密算法，该算法的特点是叠加了DNA重组，加快了置乱速度，提高了密钥的复杂度。首先，提取各个输入图像的像素值，将它们重新组合成N张 的新像素图，再转化为二进制矩阵，通过DNA重组转化为DNA密码；接着采用3D（Three-dimensional）比特置乱的方法，对DNA密码的高位和低位进行对应的置乱；最后通过异或扩散的操作得到了密文图像。仿真测试表明，该算法生成的光混沌序列具有良好的随机性和复杂性，加密的密文图像能够抵御常见的攻击方式，对密钥和明文的变化具有足够的敏感性，具有良好的安全性能。

Abstract:

This paper addresses the lengthy processing time and low encryption complexity of existing multi-image encryption algorithms based on bit scrambling and image reorganization, we propose a new medical multi-CT (Computed Tomography) image encryption algorithm that combines bit scrambling with DNA (Deoxyribonucleic acid) recombination to enhance scrambling speed and key complexity. The feature of the proposed algorithm is that DNA recombination is superimposed, which speeds up the scrambling speed and strengthens the complexity of the key Firstly, each input image's pixel values were extracted, recombined into N m*n new pixel images, converted into binary matrices, and then transformed into DNA codes. Secondly, a three-dimensional bit scrambling method was applied to the high and low bits of the DNA codes. Finally, the ciphertext image was produced using an XOR diffusion operation. Simulation results indicate that the algorithm's optical chaotic sequence exhibits strong randomness and complexity, making the encrypted image resistant to common attacks. It is highly sensitive to changes in key and plaintext, ensuring strong security.