E-governance portals are now important infrastructures in the provision of transparent, secure and efficient services to the citizens due to the rapid digitization of the public services. Nevertheless, conventional access control systems like RBAC and PBAC are not able to handle the dynamic, privacy-aware and auditing needs of new digital governance systems. This research paper presents a blockchain-supported access control system which integrates decentralized policy enforcement and Ciphertext-Policy Attribute-Based Encryption (CP-ABE) to provide fine-grained and tamper-resistant access control decisions in e-governance contexts. The architecture uses the concept of smart contracts to evaluate policies dynamically, decentralized identity (DID) management, and event recording that is immutable. The results of simulation show that it is highly scalable, has low access latency, and can protect user privacy, even when the number of users is large. The proposed model is more effective than traditional frameworks in the aspect of auditability, promptness of policy update, and impeding unauthorized access. An overall analysis will compare the system with other systems that are currently in use in access control, and it will be demonstrated that the system is applicable to the scalable citizen-friendly governance systems. The results indicate that access models that include blockchain can contribute to improving the credibility, transparency, and compliance of governmental digital services to a considerable degree.
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