International Journal for Research in Applied Science and Engineering Technology

Secure Chat Application Using BB84 Protocol

Ch. Jagadeesh, A. Eekshita, K. Jeswanth Sai, K. Vijayalakshmi, Ch. Rakesh

Published Jun 20, 2026• 0 citations

Abstract

As quantum computing continues to advance, many of the encryption methods used in today’s chat applications may no longer be secure. Techniques like RSA and Elliptic Curve Cryptography, which are currently reliable, could be broken by quantum algorithms such as Shor’s algorithm, creating risks for private communication. To address this issue, the project presents a Post-Quantum Secure Chat Application designed to remain secure even in the future. It uses Quantum Key Distribution(QKD), specifically the BB84 protocol, to generate and share encryption keys safely. Since measuring a quantum state changes it, any attempt to intercept the key can be detected. In this system, the key exchange process is simulated using quantum tools. If interference occurs, errors appear, alerting the system. Once a secure key is established, messages are encrypted using quantum-resistant methods to ensure privacy. The application includes a simple web interface for real-time messaging, a backend for handling users and messages, and a quantum module for secure key generation. The results show that the system enables secure communication and can detect eavesdropping attempts. Overall, this project demonstrated how quantum-based techniques can improve cybersecurity and provide a future-ready communication solution.

DOI: 10.22214/ijraset.2026.83746

Related papers

Development of A BB84-Based Quantum Security System

Pravin R. Kamble, Shriram Narkhede, Gayatri Bhosale +1 more

The rapid advancement of quantum computing poses a serious threat to traditional cryptographic systems such as RSA and Elliptic Curve Cryptography (ECC), which rely on computational difficulty for security. Quantum algorithms like Shor’s and Grover’s have the potential to break or weaken these methods, putting modern communication systems at risk. To address this challenge, this work presents a quantum-safe com-munication framework that combines the BB84 Quantum Key Distribution (QKD) protocol with Post-Quantum Cryptography (PQC) techniques, aiming to ensure secure data exchange in the presence of quantum-capable adversaries. In this system, the BB84 protocol is simulated to enable secure key exchange between two parties over a virtual quantum channel. The generated key is refined through processes such as basis matching, error correction, and privacy amplification using SHA-256 to ensure reliability and secrecy. For secur-ing communication, One-Time Pad (OTP) encryption is used alongside HMAC-SHA3-256 to provide both confidentiality and message integrity. Additionally, file encryption is handled using the XChaCha20-Poly1305 algorithm, selected for its efficiency and strong protection against potential vulnerabilities like nonce reuse. To further enhance security, the framework integrates a hybrid key management approach using the Kyber-512 Key Encapsulation Mechanism (KEM) combined with a Key Deriva-tion Function (KDF), merging classical and quantum-resistant techniques. Experimental results demonstrate the effectiveness of the system, achieving a Quantum Bit Error Rate (QBER) of 2.5% and successful performance in both message and file en-cryption. Overall, this work contributes toward the development of practical and resilient communication systems designed for the emerging quantum era.

International Journal of Latest Technology in Engineering Management & Applied ScienceJul 4, 20260 citations

Quantum Secure Chat System using Quantum Key Distribution and AES Encryption

Shivnarayan Sreeanand, Srivathsan B

In the era of quantum computing, conventional encryption methods are becoming more vulnerable to quantum attacks and more secure communication protocols are needed. This paper describes a Quantum Secure Chat System that facilitates real-time communication between two parties through Quantum Key Distribution (QKD) using the BB84 protocol and AES-GCM encryption to protect confidentiality and integrity. The system employs QKD for key distribution and mitigates eavesdropping attempts, whereby attempted interceptions alert parties that the key cannot be trusted. In conjunction, the system employs Quantum Random Number Generation (QRNG) to mitigate the risk of non-random and biased keys. From the front end perspective, the chat system has an intuitive interface built of HTML, CSS, and JavaScript for two users to communicate in encrypted format. From the back-end, it has implemented a Django REST framework for QKD, AES encryption, and message decryption. Information about eavesdropper detection, quantum keys, cipher text, and decrypted messages is displayed to the user and aids transparency in the key exchanging and data encryption/decryption process. The system was robustly developed and tested with release candidates to establish eavesdropping detection, as well as the ability to manage encryption and decryption in an efficient manner. Furthermore, it provides evidence of a strong security capability between the combinations of QKD and AES as a solution to enable real-time messaging.

Jun 10, 20240 citations

Quantum cryptography for secure messaging

JANGAM BHARGAVI, YERLA ASHRITHA, MULAGALA SRI HARSHITHA +1 more

The project “Quantum Cryptography for Secure Messaging” aims to create a highly secure communication system using the BB84 protocol, a key method in quantum key distribution. As traditional encryption systems face growing threats from cyberattacks and future quantum computers, this project provides a future-proof solution for message encryption. It uses simulated quantum bits (qubits) to generate secret keys based on quantum mechanics, ensuring that any eavesdropping attempts can be detected instantly. The process involves encoding binary data into quantum states, securely exchanging keys, and applying them for symmetric encryption of messages. Key features include real-time key generation, automatic encryption and decryption, and intrusion detection. The expected outcome is a working prototype of a secure messaging system that can resist both current and emerging security challenges, highlighting the potential of quantum cryptography as a foundation for the next generation of digital security.

World Journal of Advanced Research and ReviewsMar 25, 20260 citations

Secure Chat Application using Quantum Cryptography Simulation

Swapnil Pagar, Gore Sahil, Arote Rohit +2 more

This study introduces a secure chat application based on quantum cryptography simulation to strengthen the privacy and security of online messaging. The proposed system combines traditional chat functionality with Quantum Key Distribution (QKD) to safeguard conversations against eavesdropping and impersonation attacks. Using the BB84 quantum protocol, the application performs secure key exchange in a simulated environment, ensuring that only authorized users can access the messages. Simulation results demonstrate that the system achieves significantly better security than conventional encryption methods. This research provides a practical and straightforward framework for quantum-enhanced secure communication, highlighting its feasibility for real-world deployment in the future.

Jun 7, 20260 citations

Quantum Based Private Chat Space for Secure Organization

J.Prabavadhi, AmirthaVarshhini.S, Bhuvaneshwari.S, Priyadarshini.R, Yuavsri.M

The project "Quantum-Based Private Chatspace for Secure Organization" focuses on developing a secure communication platform tailored for organizational use. Leveraging quantum communication technologies, it aims to establish a chat environment capable of protecting sensitive information. The system will utilize quantum key distribution (QKD) to create and exchange cryptographic keys that are inherently resistant to eavesdropping, laying a solid foundation for secure communication. Key features will include end-to-end encryption, message integrity checks, and user authentication to meet enterprise-level security demands. The implementation of quantum security protocols will greatly strengthen data privacy and confidentiality, offering a cutting-edge defense against modern cyber threats. Furthermore, the project will involve a detailed assessment of potential security risks and rigorous testing to validate the system’s reliability and real-world applicability, thereby promoting advanced communication solutions in organizational settings.

Communications on Applied Nonlinear AnalysisSep 30, 20250 citations

Design and Implementation of a BB84-Based Two-Way Quantum Secure Communication System with AES-GCM Encryption

Abhijit Shirsath, Virendra Subhedar, Mayank Joshi, Dr. Vandana Rohakale

Quantum computing technologies are rapidly evolving and are expected to challenge the security of traditional cryptographicsystems in the near future. To address this issue, this research introduces a secure two-way communication framework based onthe BB84 Quantum Key Distribution (QKD) protocol combined with AES-GCM encryption. The proposed system establishesquantum-generated secret keys between two communicating nodes and uses those keys for authenticated symmetric encryption.The implementation includes dynamic key pool management, automatic key regeneration, Quantum Bit Error Rate (QBER)analysis, eavesdropper detection, and real-time secure communication monitoring. A Streamlit-based graphical interface enablesvisualization of quantum transmission behavior, communication status, encrypted message exchange, and channel securitymetrics. Experimental observations show that the system successfully detects interception attempts through increased QBERwhile maintaining reliable communication under secure channel conditions. The developed framework demonstrates thepracticality of integrating quantum key exchange mechanisms with modern encryption methods for next-generation securecommunication systems.

Jun 27, 20260 citations