Blockchain-Based Smart Contract Access Control System

Abstract

Research has shown that smart contracts have become a significant and promising technology. However, the lack of mature and stable security mechanism, such as access control, makes smart contracts quite vulnerable. To mitigate this problem, we present an attributed-based access control system based on blockchain by building a hierarchical management mechanism of contract administrator and contract owner. After combining blockchain inherent synchronization function with our designed system-level smart contract, all peers can easily get access control rules timely. Moreover, we modify the original smart contract finite state machine to prevent malicious modification on the rules through system contract. In our evaluation, the system only introduces 2%-5% additional cost with assured security on Hyperledger.