Understanding QKD's Security Guarantees

Jincheng Zhang

Quantum Key Distribution (QKD) is a promising technology for secure communication, leveraging the principles of quantum mechanics to ensure the confidentiality of transmitted data. This paper explores the application of a probabilistic quantum key distribution (QKD) algorithm, employing a novel approach based on quantum entanglement and topology to provide a rigorous security proof. The core mechanism involves exploiting the inherent probabilistic nature of quantum systems to demonstrate the algorithm's resistance to eavesdropping. We provide a detailed mathematical framework and justification for the proposed proof, emphasizing the role of topology in shaping the security properties. This research aims to advance the understanding of QKD's security through a probabilistic framework, offering a distinct approach to guarantee secure key exchange.

Gansel, Antoine

Horace P. Yuen

The importance of quantum key distribution as a cryptographic method depends upon its purported strong security guarantee. The following gives reasons on why such strong security guarantee has not been validly established and why good QKD security is difficult to obtain.

Daniel J. Rogers

Daniel J. Bernstein

It is often claimed that the security of quantum key distribution (QKD) is guaranteed by the laws of physics. However, this claim is content-free if the underlying theoretical definition of QKD is not actually compatible with the laws of physics. This paper observes that (1) the laws of physics pose serious obstacles to the security of QKD and (2) the same laws are ignored in all QKD "security proofs".

Akihisa Tomita