International Journal of Research and Development in Engineering Sciences https://www.ijrdes.com YEGIREDDI RAMESH 8 2 (March - April) 2026 03 March-April enBlock ChainCyber SecurityDLTRansom ware DefenseHyper ledger FabricZero-Trust Architecture. Academic institutions have become prominent targets for evolving cyber threats including ransom ware credential theft data manipulation attacks and intellectualproperty exploitation Traditional centralized security infrastructures used in universities are increasingly inadequate due to distributed learning environments large user populations and heterogeneous digital ecosystems This paper proposes a block chainenabled cyber security framework designed to enhance trust transparency and security in academic networks A permissioned block chain model is implemented to secure academic credentials research data and accesscontrol logs Experimental evaluation using hyper ledger Fabric demonstrates improvements in integrity assurance tamper resistance and detection of unauthorized record modification Comparative performance testing with conventional database systems shows enhanced traceability and reduced vulnerability to manipulation The results indicate that block chain technologies can effectively strengthen cyber Defense mechanisms in academic environments and provide a trustworthy foundation for secure digital academic ecosystems Copyright (c) 2026 International Journal of Research and Development in Engineering Sciences. All rights reserved. 2026 All Rights Reserved