Using Blockchain for Data Auditing in Cloud Storage

• Published in: Cloud Computing and Security Vol. 11065; pp. 335 - 345
• Main Authors: Li, Chunhua, Hu, Jiaqi, Zhou, Ke, Wang, Yuanzhang, Deng, Hongyu
• Format: Book Chapter
• Language: English
• Published: Switzerland Springer International Publishing AG 2018; Springer International Publishing
• Series: Lecture Notes in Computer Science
• Subjects: Behavior auditing; Blockchain; Cloud storage; Customizable log
• ISBN: 3030000117; 9783030000110
• ISSN: 0302-9743; 1611-3349
• DOI: 10.1007/978-3-030-00012-7_31

Cloud storage is one of the most important service of cloud computing. Since cloud service providers can not be completely trusted, traditional auditing methods can’t guarantee the security of data sources. This paper proposes a security framework for cloud data audit using blockchain technology. User’s operational information on the file is formed to a block after validated by all checked nodes in the blockchain network, and then to be put into the blockchain. Any modification or fake to the operational information can be inspected through the chain structure of block, thus ensuring the security of auditing data source. We construct a prototype in an Ethereum-based blockchain using Aliyun as data storage service, then test the time overhead of uploading file, broadcasting operation information and packing information into block chain. The results show that the time for packaging block remains unchanged from an overall viewpoint, and as the file size increasing, packaging block occupies less percentage in the entire process of file uploading or downloading.