Résumé: Cloud computing is a network model of on-demand access for sharing configurable computing resource pools. Comparedwith conventional service architectures, cloud computing introduces newsecurity challenges in secure service management and control, privacy protection, data integrity protection in distributed databases, data backup, and synchronization. Blockchain can be leveraged to address these challenges, partly due to the underlying characteristics such as transparency, traceability, decentralization, security, immutability, and automation. We present a comprehensive survey of how blockchain is applied to provide security services in the cloud computing model and we analyze the research trends of blockchain-related techniques in current cloud computing models. During the reviewing, we also briefly investigate how cloud computing can affect blockchain, especially about the performance improvements that cloud computing can provide for the blockchain. Our contributions include the following: (i) summarizing the possible architectures and models of the integration of blockchain and cloud computing and the roles of cloud computing in blockchain; (ii) classifying and discussing recent, relevant works based on different blockchain-based security services in the cloud computing model; (iii) simply investigating what improvements cloud computing can provide for the blockchain; (iv) introducing the current development status of the industry/major cloud providers in the direction of combining cloud and blockchain; (v) analyzing the main barriers and challenges of The work was supported by the National Key Research and Development Program of China (No. 2019QY0800), the Blockchain Core Technology Strategic Research Program of Ministry of Education of China (No. 2020KJ010301), the Shandong Provincial Key Research and Development Program (No. 2020CXGC010107), the National Natural Science Foundation of China (Nos. 61972294, 61932016, 61872192), the Special Project on Science and Technology Program of Hubei Provience (No. 2020AEA013), the Natural Science Foundation of Hubei Province (No. 2020CFA052), and the Wuhan Municipal Science and Technology Project (No. 2020010601012187). The work of K.-K. R. Choo was supported only by National Science Foundation CREST under Grant HRD-1736209, and the Cloud Technology Endowed Professorship.

Langue: Anglais