Published Paper Details:

The rapid expansion of digital communication has increased the need for secure data exchange across networks. Traditional file-sharing systems are vulnerable to unauthorized access, data leakage, and cyber-attacks, particularly when files are transmitted without encryption or stored without proper access control. This research presents a Secure File Transfer System utilizing a hybrid encryption approach combining AES-256 and RSA-2048 to ensure confidentiality and integrity during file transmission. AES is used for encrypting data due to its computational efficiency, while RSA encrypts the AES key to enhance security. Additionally, a PIN-based decryption mechanism and role-based access control (RBAC) are implemented to restrict unauthorized file access and ensure operational privacy. The system is built using Python Flask, SQLite, and cryptographic libraries with session validation to prevent backdoor access after logout. Experimental results demonstrate that the proposed system effectively protects sensitive files during upload, storage, and retrieval, while maintaining fast processing and strong authentication. This hybrid security model offers a scalable and reliable solution suitable for academic, enterprise, and cloud file-sharing environments.