BLOCK CHAIN BASED ZERO TRUST NETWORK ACCESS SYSTEM

Abstract

With the increasing number of cyber threats and sophisticated attacks, traditional network security models that rely on perimeter-based defenses are no longer sufficient. The Zero Trust Network Access (ZTNA) model addresses this issue by enforcing strict identity verification for every user and device attempting to access network resources. This project proposes a blockchain-based Zero Trust Network Access system to enhance security, transparency, and trust in network communications. In the proposed system, blockchain technology is used to maintain a decentralized and tamper-proof ledger of authentication and access records. Smart contracts are utilized to enforce access control policies dynamically, ensuring that only authenticated and authorized users can access specific resources. Each access request is verified based on multiple parameters such as user identity, device status, and contextual information. The system is implemented using blockchain frameworks and integrated with machine learning-based anomaly detection to identify suspicious activities. Experimental results demonstrate improved security, reduced risk of unauthorized access, and enhanced auditability compared to traditional systems. This approach provides a scalable and robust solution for modern network security challenges.