BLOCKCHAIN-BASED ACCESS CONTROL MODELS FOR SECURE MULTI-CLOUD SOFTWARE SYSTEMS

The rapid adoption of multi-cloud architectures enables organizations to balance cost, performance, and resilience by distributing workloads across different providers. However, this distributed environment introduces significant security and access control challenges, including inconsistent policies, fragmented identity management, and heightened risks of insider threats and data breaches. Traditional access control models—such as Role-Based Access Control (RBAC) and Attribute-Based Access Control (ABAC)—struggle to provide unified enforcement across heterogeneous cloud platforms while ensuring transparency, auditability, and trust.
This paper explores the potential of blockchain-based access control models to secure multi-cloud software systems by leveraging the immutability, decentralization, and consensus mechanisms of distributed ledger technology. Blockchain smart contracts can automate access control enforcement, eliminate reliance on centralized identity providers, and ensure tamper-proof audit trails of access decisions. Recent studies highlight that 80% of enterprises already operate in hybrid or multi-cloud environments (Flexera 2023), while 45% of cloud security incidents are linked to misconfigured or inconsistent access policies (IBM Cloud Security Report 2022)—underscoring the urgency for innovative solutions.
We analyze blockchain-enhanced RBAC and ABAC frameworks, discuss hybrid on-chain/off-chain policy enforcement, and evaluate the trade-offs of performance, scalability, and compliance. Case studies from healthcare and financial systems illustrate how blockchain access models improve accountability and regulatory alignment (e.g., HIPAA, GDPR, PCI DSS) in mission-critical workloads. Furthermore, we address key challenges such as transaction latency, interoperability across cloud providers, and privacy-preserving access control.
The paper concludes that blockchain-based access control provides a paradigm shift in securing multi-cloud environments, offering organizations a path toward transparent, verifiable, and adaptive identity and access management. By integrating blockchain with AI-driven monitoring and zero trust architectures, the future of multi-cloud security will move toward autonomous, trustless, and regulation-compliant ecosystems capable of sustaining the demands of next-generation digital services.