Design and Implementation of a Quantum Enhanced Hybrid Cryptosystem Using BB84 and Classical Encryption

This paper is all about making digital communication more secure by combining quantum technology with traditional encryption methods. Normally, we use algorithms like RSA and AES to encrypt messages, but with the increase of quantum technology, those methods might not be safe enough in the future. So, in this system, we’ve used something called the BB84 quantum cryptography key distribution protocol, when using the law of quantum physics to securely create keys for encryption. These keys are then used in RSA and AES to encrypt and decrypt messages, making the communication extremely secure. We’ve also built a simple graphical interface where users can generate keys, encrypt/decrypt messages, and even see visual graphs comparing the performance of our hybrid system with standalone AES and RSA. Overall, this paper shows how we can build a future-proof secure communication system by blending classical cryptography with quantum concepts in a practical and user-friendly way.