Docurity: A New Cryptographic Primitive for Collaborative Cloud Systems  

作　　者：Byeori Kim Minseong Choi Taek-Young Youn Jeong Hyun Yi Haehyun Cho 

机构地区：[1]Soongsil University,Seoul,06978,Korea [2]Dankook University,Yongin,16890,Korea

出　　处：《Intelligent Automation & Soft Computing》2023年第6期3725-3742,共18页智能自动化与软计算（英文）

基　　金：This work was supported in part by the Mid-Career Researcher and Basic Science Research Program through the National Research Foundation of Korea(NRF)funded by the Ministry of Science and ICT(MSIT);Future Planning under Grant NRF2020R1A2C2014336 and Grant NRF2021R1F1A105611511.

摘　　要：Recently,there has been a sudden shift from using traditional office applications to the collaborative cloud-based office suite such as Microsoft Office 365.Such cloud-based systems allow users to work together on the same docu-ment stored in a cloud server at once,by which users can effectively collaborate with each other.However,there are security concerns unsolved in using cloud col-laboration.One of the major concerns is the security of data stored in cloud ser-vers,which comes from the fact that data that multiple users are working together cannot be stored in encrypted form because of the dynamic characteristic of cloud collaboration.In this paper,we propose a novel mode of operation,DL-ECB,for AES by which we can modify,insert,and delete the ciphertext based on changes in plaintext.Therefore,we can use encrypted data in collaborative cloud-based platforms.To demonstrate that the DL-ECB mode can preserve the confidential-ity,integrity,and auditability of data used in collaborative cloud systems from adversaries,we implement and evaluate the prototype of the DL-ECB mode.

关 键 词：Cloud collaboration mode of operation auditability of ciphertext 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]