CQPToolkit

CQP Tool kit The system provides various components for integrating QKD into a security system. It's written in C++11 but uses GRPC interfaces so can be integrated with lots of different languages. Quick Start To run the software natively, ether: download and install the Ubuntu deb packages or...

CVE-2026-22020-Weak-Seed-in-Quantum-Key-Distribution-Error-Correction

CVE-2026-22020 – Weak Seed in Quantum Key Distribution Error Correction Program Code Python qkdweakseed.py - Simulated QKD privacy amplification with weak seed import hashlib, os, time def privacyamplificationsiftedkey, seed: Weak: seed derived from current time, predictable if seed is None: seed...

Combining Post-Quantum Cryptography and Quantum Key Distribution: Taxonomy, Constructions, Proofs, Standards, Deployments and Open Problems

Post-quantum cryptography PQC and quantum key distribution QKD address the quantum threat from opposite directions: PQC replaces vulnerable public-key algorithms with schemes believed to resist quantum cryptanalysis, while QKD derives keys whose secrecy rests on physical assumptions rather than...

Quantum Machine Learning Protection of Military Quantum Key Distribution against Cryptographically Camouflaged Attacks

Quantum key distribution proves its protocol secure and says nothing about the hardware beneath it, so military and government operators fielding it for command-and-control keys monitor the channel for implementation attacks, and that monitoring has a blind spot. An adversary with a kleptographic...

Quantum Key Distribution with Entanglement-Swapped Photons from a Quantum Emitter

Quantum key distribution QKD is a fundamental functionality of quantum networks. Extending its range requires quantum repeaters, a technology still under development and not yet demonstrated in combination with quantum cryptographic protocols. Here, we address the elementary operation of a viable...

Learnt Attacks on Quantum Key Distribution under Channel Noise and Device Drift

Quantum key distribution QKD links are provisioned from security analyses of stationary channels, whereas the devices that determine the channel drift between recalibrations. Whether an eavesdropper who cannot alter the channel's own noise gains by following that drift has not been quantified...

Making the Most of Leftovers: Improved Privacy Amplification for Quantum Key Distribution

The amount of secret key that can be obtained from a quantum key distribution run depends on both the physically observed error rates and the mathematical bounds used to certify security. For finite datasets, conservative bounds force users to discard a substantial fraction of the potentially...

Deterministic QKD Source Robust against Side-Channel Attacks

Quantum key distribution QKD is secure in principle, but practical security can be undermined by discrepancies between real devices and the idealized models assumed in security proofs. Source side channels, including those exploited by Trojan-horse attacks, are particularly detrimental: neglectin...

Enhancing the Security of Coherent One-Way Quantum Key Distribution Using CHSH Correlations

The coherent one-way COW protocol is a quantum key distribution scheme that has attracted significant attention, leading to the development and commercialization of practical implementations. Despite this progress, the security of the COW protocol has remained a fundamental challenge since its...

Benchmarking Optical Receivers for Quantum Communication and Randomness Certification

The choice of optical receiver determines which properties of the transmitted states remain visible in the observed data and therefore affects the performance of different quantum protocols. We compare continuous-variable, photon-counting and hybrid receivers within the same prepare-and-measure...

Noise Resilience of Quantum Key Distribution Protocols Secured against Independent Attacks with One-Way Communication

We investigate the resilience to noise of single-qubit quantum key distribution QKD protocols in the scenario of security against independent eavesdropping attacks and key distillation based on one-way classical communication. To this end, we introduce a noise-based metric that quantifies the...

Hacking Measurement-Device-Independent Quantum Key Distribution

The security of practical quantum key distribution QKD systems is fundamentally constrained by vulnerabilities of single-photon detectors. Measurement-device-independent quantum key distribution MDI-QKD was proposed to remove this limitation by allowing all measurements to be performed by a...

Authentication in Quantum Networks

In this review, we survey the cryptographic task of authentication from the perspective of quantum communication. We review three main flavours of authentication that are often conflated in the literature: authentication of classical messages, authentication of quantum messages, and entity...

Quantum Resonance Encryption for Secure Data Storage and Communication with Quantum Kicked Top

In a shared quantum computer, how to ensure data privacy and protection from access by unauthorized parties? We propose a genuine quantum protocol for protecting user's data which is not accessible even to the service provider. The protocol is based on quantum kicked top -- the dynamics of a spin...

Practical Countermeasure against Attacks Exploiting Detection Efficiency Mismatch in Quantum Key Distribution

We demonstrate a practical countermeasure against a well-known class of attacks on quantum key distribution QKD systems that exploit detection efficiency mismatch, where the receiver's detectors do not exhibit identical responses to incoming photons across all degrees of freedom. This class of...

Numerical Security Analysis for Practical Quantum Key Distribution

Quantum key distribution QKD promises information-theoretic security based on quantum mechanics and idealized device models. Practical implementations, however, deviate from these models due to unavoidable device imperfections, and existing security proofs fall short of capturing the complexity o...

Security of Decoy-State Quantum Key Distribution with Correlated Bit-And-Basis Encoders

Practical quantum key distribution QKD modulators inevitably introduce correlations, causing the state emitted in a given round to depend on the setting choices made in previous rounds. These correlations break the round-by-round independence structure on which many widely used security proof...

Rigorous Security Proofs for Practical Quantum Key Distribution

This thesis is concerned with rigorous security analyses of practical Quantum Key Distribution QKD protocols, using a variety of modern proof techniques. The main results are as follows. First, we establish a security proof for variable-length QKD protocols against IID collective attacks, and...

Quantum-Safe IPsec in the Banking Industry

The emergence of Cryptographically Relevant Quantum Computers CRQCs presents a critical threat to classical cryptographic systems, particularly widely adopted protocols such as RSA, Diffie-Hellman DH, and Elliptic Curve Cryptography ECC. Given their extensive use in the financial sector, the adve...

PQC-Enhanced QKD Networks: A Layered Approach

We present a layered and modular network architecture that combines Quantum Key Distribution QKD and Post-Quantum Cryptography PQC to provide scalable end-to-end security across long distance multi-hop, trusted-node quantum networks. To ensure interoperability and efficient practical deployment,...