1Majji Pavan Kumar, 2Rebba Surya, 3Gogula Ajay, 4Sake Sravanthi, 5Mr.V.V.B. Chari 03 04 Secure file sharing is a critical requirement in modern digital ecosystems especially with increasing concerns about data privacy integrity and unauthorized access Traditional centralized storage systems often suffer from singlepoint failures data tampering and privacy vulnerabilities This project proposes a decentralized secure file sharing system leveraging Blockchain and InterPlanetary File System IPFS Blockchain ensures immutability transparency and tamperevident audit trails for file transactions IPFS provides distributed contentaddressed storage that eliminates reliance on centralized servers Users can upload share and retrieve files securely using cryptographic hashes Smart contracts govern access control permission updates and file metadata management on the blockchain File content itself is stored on IPFS while its reference hash is recorded onchain for verification Endtoend encryption ensures confidentiality of sensitive data Consensus mechanisms prevent unauthorized modifications The system supports user authentication and rolebased access control Decentralized storage enhances fault tolerance and availability Realtime tracking of file changes prevents data tampering Auditable logs enable forensic investigations Scalability is achieved through distributed networks The architecture supports interoperability with existing storage solutions This approach strengthens data security privacy and trust for collaborative environments Overall blockchain and IPFS jointly provide a scalable and secure file sharing framework for modern applications Copyright (c) Journal of Science Engineering Technology and Management Science. All rights reserved 2026