Quantum cryptography, or more specifically quantum key distribution (QKD), is the first offspring of quantum information that has reached the stage of real-world application. Its security is based on the fact that a possible spy (Eve, the eavesdropper) cannot obtain information about the bits that Alice sends to Bob, without introducing perturbations. Therefore authorized partners can detect the spy by estimating the amount of error in their lists. The central objective of this paper is to implement and improve practical systems for quantum cryptography. The essential work carried in our research laboratory concerns the software development to implement of Quantum Key Distribution (QKD) Network based on LEO orbit number and reduce the telecommunication interruption risks and this will provide indeed a better communication quality, and investigations into the causes of losses in the system and attempts to minimize the quantum bit error rate (QBER).
Quantum cryptography, or more specifically quantum key distribution (QKD), is the first offspring of quantum information that has reached the stage of real-world application. Its security is based on the fact that a possible spy (Eve, the eavesdropper) cannot obtain information about the bits that Alice sends to Bob, without introducing perturbations. Therefore authorized partners can detect the spy by estimating the amount of error in their lists. The central objective of this paper is to implement and improve practical systems for quantum cryptography. The essential work carried in our research laboratory concerns the software development to implement of Quantum Key Distribution (QKD) Network based on LEO orbit number and reduce the telecommunication interruption risks and this will provide indeed a better communication quality, and investigations into the causes of losses in the system and attempts to minimize the quantum bit error rate (QBER).
The use of LEO satellite systems has become widespread throughout the world, not only from the services standpoint but in large scale communication networks as well, as they make it possible to communicate from any point of the globe. Lately, the communications in the satellite field have been markedly developed thanks to the Low Earth Orbit (LEO) satellites and GEO satellite orbit. This paper deals with the main survey of these networks by a demonstration of satellite constellations constitutions and the different interfering factors, namely the number of satellites in each orbit, modelling the HANDCHECK problems or Handover satellite probably blocking. In order to preserve the information, to make sure that a seamless communication between two satellite zones is ensured the Hand check should continuously be present in satellite networks. Although the achievement of such schemes is routine work in the laboratory, nontrivial problems emerge in long-distance applications. At present, the only suitable system for long-distance quantum communication is photons. The essential work carried out in our research laboratory concerns an approach in software development of the implementation of Quantum Key Distribution (QKD) Networks with LEO orbit satellites and a reduction of the telecommunication interruption risks, which indeed will provide a better communication quality.
At first sight, quantum key distribution (QKD) through the atmosphere (“free space”), might appear to be a very much more challenging problem than QKD with weak laser pulses in optical fiber: the transmitter and receiver must reliably acquire, point, and track each other to establish and maintain the quantum channel. We report approach development of a quantum cryptographic networks for secure space communication, including a Quantum photon source and a pulse laser source. Through that can be used to encrypt classical message, it will allow the development of global communication with unprecedented security. The essential work carried in our research paper concerns a new idea in satellites transmission whit implement of Quantum Key Distribution (QKD) algorithm based on photon encrypted code, including to reduce the telecommunication interruption risks and this will provide indeed a better free space communication quality.
Quantum Satellite Communications is a novel branch of transmissions which exploit quantum cryptography phenomena to guarantee the secrecy of quantum cryptographic keys. We report on the development of a Quantum Cryptographic Networks for approach to more secure space communications, including a Handover or Handoff systems and a faint pulse laser source. Through that can be used to encrypt classical message, it will allow the development of global communication with unprecedented security. A big step in the communications from the public service links between users all over the surface of the earth, how it is a major concern for all researchers to improve the yield and quality of telecommunications satellite in the world by improving the characteristics of the handover to achieve global coverage. The essential work carried in our research paper concerns approach development to implement Quantum Communications in satellite constellations networks, in object to reduce the telecommunication interruption risks and this will provide indeed of better free space communication quality.
Quantum key distribution (QKD) leveraging satellites holds promise for global-scale secure communication. However, its practical deployment is threatened by the inherent predictability of satellite orbits, which exposes quantum channels to targeted eavesdropping attacks, compromising the physical-layer security guarantees of QKD. Through security analysis, we demonstrate that such attacks can drastically increase the quantum bit error rate (QBER) from 4.7% to 27.5%, effectively disrupting secure key generation. To address this fundamental vulnerability, we introduce a novel defense framework that integrates two strategies: (1) Stealthy Deployment, which obfuscates quantum satellites within massive LEO constellations to drastically increase an adversary’s search space, and (2) Dynamic Re-routing, which is an adaptive countermeasure that re-establishes QKD sessions via alternative paths upon eavesdropping detection. Evaluated through large-scale simulations incorporating real-world satellite data, our framework demonstrates up to a 90% improvement in key generation rate under active attack, ensuring robust and resilient satellite-based QKD without modifications to the underlying quantum hardware.
With the rapid advancement of Low Earth Orbit (LEO) satellite constellations, ensuring the security of satellite-to-ground communication has become a critical concern. Traditional cryptographic techniques, while effective against classical attacks, face increasing threats from quantum computing. This paper proposes a quantum key secure transmission method tailored for LEO satellite-ground communication scenarios. The method integrates quantum key distribution (QKD) with dynamic channel estimation and orbital mobility prediction to support secure and low-latency key handshakes between satellites and ground stations. A hybrid encryption strategy is introduced, where QKD-generated keys are used to refresh symmetric session keys in real time, significantly enhancing resistance to eavesdropping and man-in-the-middle attacks. Simulation results demonstrate that the proposed method ensures stable key distribution under Doppler-shifted and intermittent link conditions, achieving improved secrecy capacity and resilience against quantum-level adversaries. This work provides a viable and scalable quantum-safe communication solution for future secure satellite networks.
This study aims at extending the concept of QKD to the optical free-space quantum communications domain. Moreover, the feasibility of a global satellite based quantum key distribution, in the low earth orbit (LEO) is investigated. Inline with this, three different link scenarios, including ground-to-ground, ground-to-satellite and satellite-to-satellite are considered. Moreover, system performance is analysed to show the sensitivity of the link to effect such as atmospheric attenuation, turbulence and detector noise. Generally, these factors are assumed to impair system performance by causing an overall increase in the systems quantum bit error rate (QBER), let alone limiting the communication bit rate and transmission distance of the link. The obtained results reveal the feasibility of satellite-based quantum key distribution in the LEO platform, a concept which could be potentially extended to geostationary earth orbit (GEO).