Secure File Sharing Using Blockchain and IPFS with Smart Contract-Based Access Control

With the growing demand for secure, decentralized file sharing solutions, this study presents a blockchain and IPFS-based framework for efficient data storage and access control. The proposed system leverages asymmetric encryption, smart contracts, and distributed access management to ensure confidentiality and integrity. The files are encrypted using AES-256 before they are stored in IPFS, and SHA-256 hashing is used to verify the content. Access control is guaranteed using blockchain-based policies, encrypting access keys and dynamic permissions to ensure that users can exchange files. An intelligent contract automates authentication, access and distribution of keys, minimizing dependence on centralized bodies. In addition, suppliers of storage facilities for an incentive mechanism reward the economy of economic and scalable storage. By using consensus mechanisms, such as proof of aspiration (POS) or proof of the authorities (POA), the system prevents unauthorized modifications and increases data security. This approach provides a reliable solution for organizations requiring controlled access to confidential data, with potential applications in the field of financial, health care and public sectors.