In the contemporary quantum world, all the things depend on upcoming quantum technology because of its effectiveness and robustness on deploying it in certain devices. An important use of quantum cryptography is quantum key distribution (QKD), which promises strong security by utilising quantum mechanical properties. However, real-world attack strategies have created practical vulnerabilities. The practical security analysis of intercept-and-resend attacks over continuous variable quantum key distribution (CV-QKD) and discrete variable quantum key distribution (DV-QKD) protocols is investigated in this work. The simulation models can be developed using custom NumPy and QuTip, we systematically analyze the protocols performance under changing channel losses and attack probabilities for the successful emulation of quantum communication processes. In order to evaluate protocol robustness, our study assesses key security measures such as Key generation rate and channel loss exemplified by simulation over QKD protocols. Our simulation testbed shows the sensitivity of the protocols to Intercept-and-Resend (IR) attacks and recognize under various environments where the security premises breakdown. The main objective of this work is to bridge the research gap between quantum theoretic security and its deployment in real-world communication networks, provides a clear insight into the design and development of more sophisticated quantum secure framework.
In the contemporary quantum world, all the things depend on upcoming quantum technology because of its effectiveness and robustness on deploying it in certain devices. An important use of quantum cryptography is quantum key distribution (QKD), which promises strong security by utilising quantum mechanical properties. However, real-world attack strategies have created practical vulnerabilities. The practical security analysis of intercept-and-resend attacks over continuous variable quantum key distribution (CV-QKD) and discrete variable quantum key distribution (DV-QKD) protocols is investigated in this work. The simulation models can be developed using custom NumPy and QuTip, we systematically analyze the protocols performance under changing channel losses and attack probabilities for the successful emulation of quantum communication processes. In order to evaluate protocol robustness, our study assesses key security measures such as Key generation rate and channel loss exemplified by simulation over QKD protocols. Our simulation testbed shows the sensitivity of the protocols to Intercept-and-Resend (IR) attacks and recognize under various environments where the security premises breakdown. The main objective of this work is to bridge the research gap between quantum theoretic security and its deployment in real-world communication networks, provides a clear insight into the design and development of more sophisticated quantum secure framework.
By utilizing concepts from quantum physics like entanglement and superposition, quantum cryptography is revolutionizing data security. This study focuses on the application of classical computational models for simulation-based analysis of Quantum Key Distribution (QKD) protocols, namely BB84 and E91. By taking use of quantum features, QKD makes secure key exchange possible and guarantees that any effort at eavesdropping may be identified because of the disruption of quantum states. In order to assess how quantum communication channels behave under different noise and attack scenarios, the study models and simulates these channels. The study evaluates the efficacy and robustness of BB84 and E91 protocols in practical network settings by contrasting their performance and error tolerance. In order to determine if integrating quantum-secured systems with current classical infrastructures is feasible, scalability issues are also investigated. These simulations’ outcomes shed light on feasible security levels, resource needs, and workable deployment tactics. In the end, this research highlights how quantum cryptography may advance the basis for next-generation secure information networks by bridging the gap between theoretical quantum security models and real-world communication systems with the use of strong simulation frameworks.
Quantum Key Distribution (QKD) is revolutionizing cryptography by promising information-theoretic security through the immutable laws of quantum mechanics. Yet, the challenge of transforming these idealized security models into practical, resilient systems remains a pressing issue, especially as quantum computing evolves. In this review, we critically dissect and synthesize the latest advancements in QKD protocols and their security vulnerabilities, with a strong emphasis on rigorous security proofs. We actively categorize contemporary QKD schemes into three key classes: uncertainty principle-based protocols (e.g., BB84), hybrid architectures that enable secure direct communication (eg, three-stage protocol), and continuous-variable frameworks. We further include two modern classes of QKD protocols, namely Twin-field QKD and Device-Independent QKD, both of which were developed to have practical implementations over the last decade. Moreover, we highlight important experimental breakthroughs and innovative mitigation strategies, including the deployment of advanced Quantum Error Correction Codes (QECCs), that significantly enhance channel fidelity and system robustness. By mapping the current landscape, from sophisticated quantum attacks to state-of-the-art error correction methods, this review fills an important gap in the literature. To bring everything together, the relevance of this review concerning quantum augmented networks (QuANets) is also presented. This allows the readers to gain a comprehensive understanding of the security promises of quantum key distribution from theoretical proofs to experimental validations.
Quantum Key Distribution (QKD) has emerged as a critical component of secure communication in the post-quantum era. This study provides a comparative security and performance analysis of leading QKD protocols—BB84, E91, and Continuous Variable QKD—using experimental and simulated data from terrestrial and satellite-based implementations. Key metrics such as secret key rate, bit error rate, and resistance to quantum attacks are analyzed. Regression and predictive modeling are used to quantify performance decay over distance and noise. The results indicate BB84's robustness and broad applicability, while CV-QKD offers throughput advantages in short-range networks. Keywords: Quantum Key Distribution, QKD, BB84, E91, Continuous Variable QKD, Cryptographic Security, Quantum Communication, Post-Quantum Security
The BB84 protocol is fundamental to quantum-secure communications, yet its extension to multi-receiver networks remains underexplored. This study addresses this gap by implementing a dual-receiver BB84 framework in Qiskit to evaluate security against intercept–resend and photon-number-splitting (PNS) attacks. Our methodology incorporates weak coherent pulses and realistic channel imperfections. Key findings show that intercept–resend attacks induce a detectable (~25%) increase in QBER, while PNS attacks allow a 100% gain in eavesdropper information with less than 2.5% QBER—revealing a critical vulnerability, which highlights the importance of a true single-photon source. The findings emphasize the suitability of BB84 for multiparty QKD scenarios, either as a decoy-state mechanism for enhanced eavesdropping detection or as a direct secure communication protocol.
How to guarantee the practical security of continuous-variable quantum key distribution (CVQKD) system has been an important issue in the quantum cryptography applications. In contrast to the previous practical security strategies, which focus on the intercept-resend attack or the Gaussian attack, we investigate the practical security strategy based on a general attack, i.e., an arbitrated individual attack or collective attack on the system by Eve in this paper. The low bound of intensity disturbance of the local oscillator signal for eavesdropper successfully concealing herself is obtained, considering all noises can be used by Eve in the practical environment. Furthermore, we obtain an optimal monitoring condition for the practical CVQKD system so that legitimate communicators can monitor the general attack in real-time. As examples, practical security of two special systems, i.e., the Gaussian modulated coherent state CVQKD system and the middle-based CVQKD system, are investigated under the intercept-resend attacks.
Continuous-variable quantum key distribution (CV-QKD) has emerged as a promising approach for secure quantum communication, offering advantages such as high key generation rates, compatibility with standard telecommunication infrastructure, and potential for integration on photonic chips. This review provides an accessible introduction to the theory of CV-QKD, aimed at researchers entering this rapidly developing field. We focus on fundamental concepts, key protocols, and security analysis essential for understanding CV-QKD systems, with a special emphasis on prepare-and-measure protocols using coherent states under asymptotic security conditions. We explain their equivalence to entanglement-based protocols and detail the security proof framework against collective attacks, encompassing both Gaussian and discrete modulation schemes. We also briefly address more advanced topics, including measurement-device-independent CV-QKD and finite-size security analysis. This work is motivated by Brazil's growing investment in quantum communication technologies. By presenting a clear learning path from basic concepts to advanced topics, this work aims to equip newcomers with the essential tools to engage with current research in CV-QKD, thereby supporting the training of a new generation of researchers in this strategic field.