Abstract
The proliferation of mobile smartphones and the Internet has enabled people to stay online, gradually changing how people live and work. Particularly during epidemic isolation, people are more likely to communicate online via the Internet. Limited by the storage capacity and network bandwidth of mobile terminals, users are more likely to use the cloud to store and share data. However, data stored by centralized cloud services in a semi-trusted environment is at risk of being compromised, and most systems use cryptographic access control for the data, which failed to achieve fine-grained access control. In this paper, we propose a data access control system based on cloud and blockchain integration (CBI), which takes the decentralized, tamper-proof characteristics of blockchain and combines the advantages of cloud storage to design a novel integrated architecture, and designed a CBI-CP-ABE algorithm to implement attribute-based encryption for fine-grained access control. Experiments show that our proposed solution has similar performance to traditional data access control systems, and users have higher control and management rights over their data in the cloud so that they can store and share data more securely and keep track of their data usage.
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