云环境下的图像分治压缩加密算法  

Divide and conquer image compression and encryption algorithm in a cloud environment

作　　者：白恩健[1] 曾皓炜 吴贇[1] 蒋学芹 BAI Enjian;ZENG Haowei;WU Yun;JIANG Xueqin(College of Information Science and Technology,Donghua University,Shanghai 201620,China)

机构地区：[1]东华大学信息科学与技术学院,上海201620

出　　处：《哈尔滨工程大学学报》2025年第3期592-600,共9页Journal of Harbin Engineering University

基　　金：国家自然科学基金项目(61972080);上海市自然科学基金项目(20ZR1400700).

摘　　要：为解决加密的图像在云环境下需要图像预览的应用需求,本文提出一种基于差值变换和脱氧核糖核酸编码的混沌图像分治压缩加密算法。通过差值变换将图像预处理为原始图像和供预览的小尺寸缩略图像,利用四维分数阶混沌系统对原始图像进行无损压缩加密,对缩略图像采用脱氧核糖核酸混合的高低位强加密,实现原始图像和缩略图像的分开解密,有效降低传输数据量和提高加密效率。实验结果证明:算法对原始图像的压缩比约为1.4,对全图强加密的效率比约为0.05~0.3。缩略图强加密具有良好的加密性能,能够抵御相关性分析、熵分析和差分分析等安全攻击。完全解密图像依赖于缩略图像的解密,算法的总体安全性能得到保障。A chaotic image divide-and-conquer compression and encryption algorithm based on difference value transformation and deoxyribonucleic acid(DNA)coding is proposed to satisfy the application requirements of image preview for encrypted images in a cloud environment.The image is preprocessed into the original image and a small-sized thumbnail image for preview through difference value transformation.The original image is losslessly compressed and encrypted using a four-dimensional fractional-order chaotic system.The thumbnail image is strongly encrypted using the DNA mixed high-low encryption to enable the split decryption of the original image and the thumbnail image,effectively reducing the amount of data transmitted and improving the encryption efficiency.The experimental results demonstrate that the algorithm achieves a compression ratio of approximately 1.4 for the original image and an efficiency ratio of approximately 0.05-0.3 for strong encryption of the entire image.The thumbnail strong encryption achieved exhibits excellent encryption performance and can resist security attacks,such as correlation,entropy,and differential analyses.The decryption of thumbnail images is essential for the complete decryption of the full images,ensuring the overall security performance of the algorithm.

关 键 词：云环境 图像预览 分治压缩加密 分数阶混沌系统 差值变换 脱氧核糖核酸加密 高低位加密 无损压缩 差值霍夫曼编码 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]