FACOS: Enabling Privacy Protection Through Fine-Grained Access Control with On-chain and Off-chain System
Chao Liu, Cankun Hou, Tianyu Jiang, Jianting Ning, Hui Qiao, Yusen Wu

TL;DR
FACOS is a blockchain-based system that provides fine-grained, privacy-preserving access control for sensitive data across sectors, enhancing security, scalability, and auditability through innovative on-chain and off-chain solutions.
Contribution
The paper introduces FACOS, a novel permissioned blockchain system that integrates TEE and Byzantine fault tolerance to improve off-chain data security and access control.
Findings
Enhanced off-chain data security with Byzantine fault tolerance
Improved client verification using TEE-based solutions
Better scalability and practicality than existing systems
Abstract
Data-driven landscape across finance, government, and healthcare, the continuous generation of information demands robust solutions for secure storage, efficient dissemination, and fine-grained access control. Blockchain technology emerges as a significant tool, offering decentralized storage while upholding the tenets of data security and accessibility. However, on-chain and off-chain strategies are still confronted with issues such as untrusted off-chain data storage, absence of data ownership, limited access control policy for clients, and a deficiency in data privacy and auditability. To solve these challenges, we propose a permissioned blockchain-based privacy-preserving fine-grained access control on-chain and off-chain system, namely FACOS. We applied three fine-grained access control solutions and comprehensively analyzed them in different aspects, which provides an intuitive…
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Taxonomy
TopicsSecurity and Verification in Computing
