Security of Quantum Key Distribution

Sakshi Singh, Avdhesh Gupta, Anu Chaudhary

The theory of QKD was first introduced in the 1980s. Initially, classical cryptographic methods were used to secure communication, but it was not a secure approach. Quantum Key Distribution (QKD) represents high-tech solution in the arena of secure and reliable cryptography and communication. Quantum key distribution make the use of quantum superposition and quantum entanglement to facilitate the secure interchange of cryptographic keys between two parties, with a theoretical invulnerability resistant to many threats, also including the threats that classical computing faces. On the other hand, blockchain is secured through cryptographic measures. A wide range of block chain applications rely on digital signatures and hash function which is easily traceable by quantum computers. The progress in quantum computing poses a potential risk of compromising existing cryptographic algorithms, in response to this challenge, proposals for potential solutions, such as the development of quantum-resistant blockchains, are being presented. The motivation of this study is to secure blockchain with the help of QKD. Fundamentally, understanding quantum key distribution is challenging. Hence, this research employs a Quantum Key Distribution Network simulator to analyze key distribution. The study focuses on illuminating the security concerns within blockchain and explores a potential solution through the deployment of quantum key distribution. Additionally, the research delves into the examination of a quantum key distribution network using a dedicated simulator.

Norbert Lütkenhaus

Jincheng Zhang

Quantum Key Distribution (QKD) represents a paradigm shift in secure communication, leveraging the fundamental laws of quantum mechanics to guarantee key exchange. This paper investigates the application of topological security to QKD, proposing a novel algorithm that analyzes the vulnerabilities inherent in the key distribution process to enhance security and proactively identify potential attack risks. We propose a method that models the key distribution process with a focus on the robustness of the underlying topology, effectively assessing security levels and identifying potential weaknesses. The core mechanism centers around leveraging the inherent properties of quantum systems to build a robust and secure key distribution protocol. This paper presents a comprehensive evaluation of this approach, demonstrating its potential to significantly improve the security of QKD systems.

Víctor Zapatero

Vimal Gaur, Devika Mehra, Anchit Aggarwal +2 more

Liujun Wang, You-Yang Zhou, Jian-Ming Yin +1 more

With the development of quantum computers, traditional cryptographic systems are facing more and more serious security threats. Fortunately, quantum key distribution (QKD) and post-quantum cryptography (PQC) are two cryptographic mechanisms with quantum-resistant security, and both will become important solutions for future information security. However, neither of them is perfect, and they are complementary. Quantum key distribution has unconditional security that post-quantum cryptography does not have, and PQC can provide secure and convenient authentication for QKD networks. In this paper, we propose two protocols based on PQC to realize the full authentication of the QKD data post-processing, and we only need to assume the short-term security of PQC algorithm to ensure the long-term quantum resistant security of distributed keys. We found that for the above two authentication protocols, attackers cannot successfully implement replay attacks. These authentication protocols can solve the problems of the current pre-shared key authentication in the application of large-scale quantum key distribution networks, and are expected to realize a key distribution mechanism with practical operability and quantum resistant security, which will be beneficial to promote the deployment and application of quantum key distribution networks.