Decentralized and Secure Access Control Model for Multi-Cloud Data Storage

Abstract

Cloud storage has transformed data management by offering improved scalability, flexibility, and efficiency. However, as more sensitive information is stored in the cloud, security concerns have grown significantly. Traditional cloud storage systems, which rely on centralized access control policies, are vulnerable to risks, such as unauthorized access and data breaches. This study introduces a blockchain-based approach that enhances access control in multi-cloud storage environments. The proposed model uses a decentralized access control paradigm to improve security, while also creating an immutable record of all data activities. Access permissions are managed dynamically to prevent unauthorized parties from accessing the data and encryption keys. Every access attempt is logged securely, providing a transparent and verifiable history for all user interactions. The layered design of the framework combines strong security, transparency, and scalability, making it well suited for handling sensitive data. The experimental results highlight the efficiency of the system in key areas such as encryption speed, upload latency, and scalability. These findings demonstrate the ability of the framework to address the constraints of conventional centralized access control paradigms, particularly in terms of auditing and logging.