Secure and Efficient Data Storage and Sharing Scheme Based on Double Blockchain  

作　　者：Lejun Zhang Minghui Peng Weizheng Wang Yansen Su Shuna Cui Seokhoon Kim 

机构地区：[1]College of Information Engineering,Yangzhou University,Yangzhou,225127,China [2]School Math&Computer Science,Quanzhou Normal University,Quanzhou,362000,China [3]Division of Computer Science,University of Aizu,Aizu–Wakamatsu,9658580,Japan [4]Key Laboratory of Intelligent Computing and Signal Processing of Ministry of Education,School of Computer Science and Technology,Anhui University,Hefei,230601,China [5]Medical College of Yangzhou University,Yangzhou,225001,China [6]Department of Gynecology and Obstetrics,Affiliated Hospital of Yangzhou University,Yangzhou,China [7]Department of Computer Software Engineering,Soonchunhyang University,Asan,Korea

出　　处：《Computers, Materials & Continua》2021年第1期499-515,共17页计算机、材料和连续体（英文）

基　　金：the Natural Science Foundation of Heilongjiang Province of China under Grant No.LC2016024;Natural Science Foundation of the Jiangsu Higher Education Institutions Grant No.17KJB520044;Six Talent Peaks Project in Jiangsu Province No.XYDXX–108.

摘　　要：In the digital era,electronic medical record(EMR)has been a major way for hospitals to store patients’medical data.The traditional centralized medical system and semi-trusted cloud storage are difficult to achieve dynamic balance between privacy protection and data sharing.The storage capacity of blockchain is limited and single blockchain schemes have poor scalability and low throughput.To address these issues,we propose a secure and efficient medical data storage and sharing scheme based on double blockchain.In our scheme,we encrypt the original EMR and store it in the cloud.The storage blockchain stores the index of the complete EMR,and the shared blockchain stores the index of the shared part of the EMR.Users with different attributes can make requests to different blockchains to share different parts according to their own permissions.Through experiments,it was found that cloud storage combined with blockchain not only solved the problem of limited storage capacity of blockchain,but also greatly reduced the risk of leakage of the original EMR.Content Extraction Signature(CES)combined with the double blockchain technology realized the separation of the privacy part and the shared part of the original EMR.The symmetric encryption technology combined with Ciphertext-Policy Attribute-Based Encryption(CP–ABE)not only ensures the safe storage of data in the cloud,but also achieves the consistency and convenience of data update,avoiding redundant backup of data.Safety analysis and performance analysis verified the feasibility and effectiveness of our scheme.

关 键 词：Cloud storage blockchain electronic medical records access control data sharing PRIVACY 

分 类 号：TP3[自动化与计算机技术—计算机科学与技术]