可用性增强的缩略图保持加密  

Usability-enhanced thumbnail-preserving encryption

作　　者：叶茜 张玉书 赵若宇 肖祥立 温文媖[2] YE Xi;ZHANG Yu-shu;ZHAO Ruo-yu;XIAO Xiang-li;WEN Wen-ying(College of Computer Science and Technology,Nanjing University of Aeronautics and Astronautics,Nanjing 211106;School of Information Management,Jiangxi University of Finance and Economics,Nanchang 330032,China)

机构地区：[1]南京航空航天大学计算机科学与技术学院,江苏南京211106 [2]江西财经大学信息管理学院,江西南昌330032

出　　处：《计算机工程与科学》2023年第9期1563-1571,共9页Computer Engineering & Science

基　　金：国家自然科学基金(62072237);南京航空航天大学研究生科研与实践创新计划(xcxjh20221608)。

摘　　要：传统加密在保护云储存图像隐私的同时使其完全丧失视觉可用性。尽管缩略图保持加密可平衡图像隐私性和视觉可用性,但现有方案均不考虑保留非视觉可用性。为此,提出一个可用性增强的缩略图保持加密方案。该方案利用信息隐藏的可逆性和灵活性,腾出原始图像的部分空间用于像素调整,从而保持密文缩略图与原始缩略图近似。在进行像素调整之前,对图像进行传统加密以保障安全性。在完成像素调整之后,凭借所剩余的空间容量嵌入额外信息,这些额外信息可为用户提供非视觉可用性。所提缩略图保持加密方案不仅平衡了隐私性和视觉可用性,还在一定程度上保留了非视觉可用性。最后,实验结果证实了所提方案的有效性和先进性。Traditional encryption protects the privacy of images stored in the cloud while completely depriving them of visual usability.Though thumbnail-preserving encryption(TPE)can balance image privacy and visual usability,none of the existing options consider the preservation of non-visual usability.In view of this,a usability-enhanced TPE scheme is proposed.This scheme takes advantage of the reversibility and flexibility of data hiding,freeing up part of the original image space for pixel adjustment to keep the ciphertext thumbnail similar to the original one.Before performing pixel adjustment,the image is traditionally encrypted for security.After the pixel adjustment is completed,the remaining space capacity is used to embed additional information that provides non-visual usability to users.Therefore,the proposed TPE solution not only balances privacy and visual usability,but also preserves non-visual usability to a certain extent.Finally,experimental results confirm the effectiveness and advancement of the proposed scheme.

关 键 词：缩略图保持加密 视觉隐私保护 信息隐藏 图像加密 云储存 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]