Secure File Sharing System on Cloud

Cloud computing has become a widely adopted technology for storing and sharing data due to its scalability, flexibility, and cost-effectiveness 1. However, storing sensitive information on third-party cloud servers introduces significant security risks such as unauthorized access, data breaches, and cyber-attacks 2. Ensuring confidentiality, integrity, and secure access control remains a major challenge in cloud-based file sharing systems 3. This research proposes a Secure File Sharing System on Cloud that focuses on protecting data through strong encryption and controlled access mechanisms. The proposed system uses advanced cryptographic techniques to secure files before uploading them to the cloud. Symmetric encryption algorithms such as AES are applied to encrypt file content 1, while asymmetric encryption like RSA is used for secure key exchange 4. This ensures that only authorized users with valid decryption keys can access the shared files. Even if the cloud storage is compromised, encrypted data remains 12. unreadable to attackers 5. To strengthen security further, the system incorporates multi-factor authentication and role-based access control 6. Users are assigned specific roles, and permissions are granted based on their authorization level. Secure key management is implemented to prevent exposure of encryption keys 7. Additionally, cryptographic hash functions such as SHA-256 are used to verify data integrity and detect any unauthorized modifications 2. The system also enables secure file sharing through encrypted links with time-limited access, allowing users to revoke permissions when necessary. By integrating encryption, authentication, and integrity verification, the proposed solution enhances trust and security in cloud environments while maintaining system efficiency and usability.