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Lecture notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering

A Secure Blockchain Network with Quantum Key Encryption and Authentication

Ashutosh Dhar Dwivedi, Μάριος Αναγνωστόπουλος, Jens Myrup Pedersen

Published Sep 4, 2025• 0 citations
Publisher
DOI
10.1007/978-3-031-94445-1_21

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The rapid spreading of Internet of Things (IoT) applications have been significant challenges in achieving secure, lightweight and scalable authentication particularly due to the arising threats of quantum threats. In order to solve these issues, this paper introduces the Dynamic Adaptive Post-Quantum Elliptic Blockchain (DAPQEB) protocol which combines Elliptic Curve Cryptography (ECC), Post-Quantum Cryptography (PQC) and blockchain technology to perform decentralized and tamper-proof authentication. The protocol makes use of hybrid key generation based on ECC and PQC secrets, further supported by Key Derivation Function (HKDF)-based derivation of sessions and blockchain-based attestation that is not revoked. An active adaptation scheme also contributes to resilience by modifying the cryptographic functions depending on device resources and threat intensity, tradeoffs between performance and security. Experimental simulations on simulation networks are performed using several network sizes with energy model parameters, latency and adaptive thresholds. These findings prove that DAPQEB is more effective than the existing methods in energy consumption, throughput, ratio of packet delivery, network lifetime and detection rate. Although its generation, encryption and decryption time are slightly higher, these are reasonable trade-offs with increased robustness and quantum resistance. Altogether, DAPQEB is a resource-optimized, scalable and secure authentication system that is been applied in energy-sensitive and large-scale IoT networks.
Background and Aims: Rising quantum hazards and flaws in conventional encryption make cloud-based healthcare data security harder. Quantum-Secure HealthChain, a new architecture using blockchain and quantum computing, improves medical data security, patient privacy, and data fidelity. Methods: To prevent quantum attacks, the proposed system uses Quantum Key Distribution (QKD) for safe cryptographic key exchange and quantum-resistant encryption. Blockchain technology secures medical records, while multi-layered encryption ensures data privacy. Quantum Biometric Authentication improves access control using quantum entanglement and biometric data. Key generation, encryption, blockchain storage, authentication, and decryption are system process steps. Experimental evaluation focuses on encryption speed, resource economy, throughput, and scalability using simulated healthcare data. Results: Experimental data demonstrate system strength and efficiency. Encryption and decryption perform consistently for 1 to 100 MB data sizes with negligible overhead. Throughput can reach 105 transactions per second under normal demand; CPU (82%) and memory (210 MB) utilization are low. Scalability studies show linear expansion lets the system handle increased data volumes and user demands without sacrificing performance. Security study confirms quantum attack, data corruption, and unauthorized access resistance. Conclusion: Quantum-Secure HealthChain offers a revolutionary method to cloud-based healthcare system security. Blockchain-quantum computing integration ensures strong authentication, safe key exchange, and quantum-resistant encryption. Its security, scalability, and efficiency make it a future-ready platform for safe medical data management, reducing quantum computing hazards.
As 6G networks are about to serve billions of devices, secure and reliable authentication is a key challenge. Conventional authentication solutions are under attack from both centralized and future quantum computing threats. This paper introduces a new authentication protocol that incorporates randomness generated by quantum mechanics and blockchain technology to achieve a lightweight, decentralized, and post-quantum secure solution for 6G scenarios. Each device creates a truly random key from a Quantum Random Number Generator (QRNG), and this key is then securely stored on a blockchain in hashed form. When the device tries to join the network, its key is checked against the blockchain ledger to provide for one-time, tamper- evident authentication without the need for centralized servers. The protocol is designed to support smart contracts for expiry and revocation of keys, rendering it appropriate for dense and highly dynamic 6G networks. Our system provides increased security, immunity against future quantum attacks, and efficient scaling for IoT, healthcare, and autonomous communication systems.