Blockchain-Based Access Control for Securing Critical Infrastructures

In the recent world of digital transformation, securing critical infrastructures such as power grids, transportation systems, and communication networks has become paramount. The conventional methods for access control, which largely depend on centralized models, are increasingly vulnerable to cyber-attacks and data breaches. This paper introduces a novel approach to enhance the security of critical infrastructures using blockchain technology. By leveraging the inherent properties of blockchain, such as decentralization, transparency, and immutability, our method establishes a robust framework for access control. This decentralized access control system (DACS) utilizes smart contracts to automate and enforce access policies without the need for a central authority. The blockchain-based system ensures that all access requests and approvals are recorded on a tamper-proof ledger, enhancing the auditability and accountability of the access control process. We evaluate the performance of our proposed system through simulations that demonstrate its resilience against common security threats, including unauthorized access and insider attacks. Additionally, the system's scalability and efficiency in handling large-scale networks are analysed. Our findings indicate that blockchain-based access control significantly enhances the security posture of critical infrastructures while ensuring compliance with stringent regulatory requirements.