Authcloudfile: Encrypted File Storage with QR-Based Access and Expiration Control

Abstract: File sharing is a fundamental aspect of digital communication, enabling users to exchange data efficiently across networks. However, traditional file-sharing methods, such as email attachments, cloud storage links, and peer-to-peer transfers, often face security vulnerabilities, including unauthorized access, data interception, and weak encryption mechanisms. Many existing systems lack robust authentication or rely on manual key exchange, making them susceptible to attacks such as man-in- the-middle (MITM), phishing, and unauthorized data breaches. To overcome these challenges, the project integrates AES encryption, Two-Factor Authentication (2FA), and Reed-Solomon error correction to ensure confidentiality, integrity, and reliability. The system requires users to authenticate via 2FA (username, password, and OTP verification) before uploading files. Each uploaded file undergoes AES- 256 encryption, ensuring that only authorized recipients can decrypt it. A QR code is generated, embedding a secure file access link while incorporating Reed- Solomon error correction for improved scanning accuracy.