Using post-quantum encryption, asymmetric and symmetric cryptography, and digital signatures, this study offers a sophisticated cryptographic file-sharing system that guarantees data integrity, confidentiality, and authenticity. Elliptic Curve Digital Signature Algorithm (ECDSA) for authentication, Advanced Encryption Standard (AES) for file encryption, and Kyber for key generation and exchange are all integrated into the suggested system. Furthermore, three-factor authentication (3FA) including password, OTP verification and face recognization is used to improve system security during login. The solution is suitable for both personal and business file- sharing applications since experimental results demonstrate how well it reduces security flaws while preserving performance.