scholarly journals Nonclassical Attack on a Quantum Key Distribution System

Entropy ◽  
2021 ◽  
Vol 23 (5) ◽  
pp. 509
Author(s):  
Anton Pljonkin ◽  
Dmitry Petrov ◽  
Lilia Sabantina ◽  
Kamila Dakhkilgova
Keyword(s):  
Optical Communication ◽  
Distribution System ◽  
Quantum Key Distribution ◽  
Distribution Systems ◽  
System Development ◽  
Experimental Studies ◽  
Key Distribution ◽  
Time Interval ◽  
Quantum Protocol ◽  
Research Show

The article is focused on research of an attack on the quantum key distribution system and proposes a countermeasure method. Particularly noteworthy is that this is not a classic attack on a quantum protocol. We describe an attack on the process of calibration. Results of the research show that quantum key distribution systems have vulnerabilities not only in the protocols, but also in other vital system components. The described type of attack does not affect the cryptographic strength of the received keys and does not point to the vulnerability of the quantum key distribution protocol. We also propose a method for autocompensating optical communication system development, which protects synchronization from unauthorized access. The proposed method is based on the use of sync pulses attenuated to a photon level in the process of detecting a time interval with a signal. The paper presents the results of experimental studies that show the discrepancies between the theoretical and real parameters of the system. The obtained data allow the length of the quantum channel to be calculated with high accuracy.

scholarly journals Vulnerability of the Synchronization Process in the Quantum Key Distribution System

2019 ◽  
Vol 9 (1) ◽  
pp. 50-58 ◽  
Author(s):  
A. P. Pljonkin
Keyword(s):  
Distribution System ◽  
Quantum Key Distribution ◽  
Communication Channel ◽  
Quantum Communication ◽  
Experimental Studies ◽  
Key Distribution ◽  
Time Interval ◽  
Typical Structure ◽  
Synchronization Process ◽  
Quantum Communication Channel

A typical structure of an auto-compensation system for quantum key distribution is given. The principle of operation of a fiber-optic system for the distribution of quantum keys with phase coding of photon states is described. The operation of the system in the synchronization mode and the formation of quantum keys was investigated. The process of detecting a time interval with an optical synchronization pulse is analyzed. The structural scheme of the experimental stand of the quantum-cryptographic network is given. Data are obtained that attest to the presence of a multiphoton signal during the transmission of sync pulses from the transceiver station to the coding and backward direction. The results of experimental studies are presented, which prove the existence of a vulnerability in the process of synchronization of the quantum key distribution system. It is shown that the use of a multiphoton optical pulse as a sync signal makes it possible for an attacker to unauthorized access to a quantum communication channel. The experimental results show that tapping a portion of the optical power from the quantum communication channel during the synchronization process allows an attacker to remain unnoticed while the quantum protocol is operating. Experimentally proved the possibility of introducing malfunctions into the operation of the quantum communication system at the stage of key formation, while remaining invisible for control means.

scholarly journals Vulnerability of the Synchronization Process in the Quantum Key Distribution System

2021 ◽  
pp. 345-354
Author(s):  
A. P. Pljonkin
Keyword(s):  
Distribution System ◽  
Quantum Key Distribution ◽  
Communication Channel ◽  
Quantum Communication ◽  
Experimental Studies ◽  
Key Distribution ◽  
Time Interval ◽  
Synchronization Process ◽  
Quantum Communication Channel ◽  
Fiber Optic System

A typical structure of an auto-compensation system for quantum key distribution is given. The principle of operation of a fiber-optic system for the distribution of quantum keys with phase coding of photon states is described. The operation of the system in the synchronization mode and the formation of quantum keys was investigated. The process of detecting a time interval with an optical synchronization pulse is analyzed. The structural scheme of the experimental stand of the quantum-cryptographic network is given. Data are obtained that attest to the presence of a multiphoton signal during the transmission of sync pulses from the transceiver station to the coding and backward direction. The results of experimental studies are presented, which prove the existence of a vulnerability in the process of synchronization of the quantum key distribution system. It is shown that the use of a multiphoton optical pulse as a sync signal makes it possible for an attacker to unauthorized access to a quantum communication channel. The experimental results show that tapping a portion of the optical power from the quantum communication channel during the synchronization process allows an attacker to remain unnoticed while the quantum protocol is operating. Experimentally proved the possibility of introducing malfunctions into the operation of the quantum communication system at the stage of key formation, while remaining invisible for control means.

Modeling of Quantum Key Distribution System for Secure Information Transfer

2014 ◽  
pp. 811-840
Author(s):  
K. E. Rumyantsev ◽  
D. M. Golubchikov
Keyword(s):  
Distribution System ◽  
Quantum Key Distribution ◽  
Information Transfer ◽  
Distribution Systems ◽  
Key Distribution ◽  
Photon State ◽  
Secure Information ◽  
Sequence Production ◽  
Security Infrastructure ◽  
Processing Algorithms

This chapter is an analysis of commercial quantum key distribution systems. Upon analysis, the generalized structure of QKDS with phase coding of a photon state is presented. The structure includes modules that immediately participate in the task of distribution and processing of quantum states. Phases of key sequence productions are studied. Expressions that allow the estimation of physical characteristics of optoelectronic components, as well as information processing algorithms impact to rate of key sequence production, are formed. Information security infrastructure can be utilized, for instance, to formulate requirements to maximize tolerable error level in quantum channel with a given rate of key sequence production.

scholarly journals A low cost, short range quantum key distribution system

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
David Lowndes ◽  
Stefan Frick ◽  
Andy Hart ◽  
John Rarity
Keyword(s):  
Form Factor ◽  
Distribution System ◽  
Quantum Key Distribution ◽  
Short Range ◽  
Distribution Systems ◽  
Low Cost ◽  
Key Distribution ◽  
Consumer Market

AbstractWe present a miniaturized quantum key distribution system, designed to augment the more mature quantum key distribution systems currently commercially available. Our device is designed for the consumer market, and so size, weight and power are more important than raw performance. To achieve our form factor, the transmitter is handheld and the receiver is a larger fixed terminal. We envisage users would bring their transmitters to centrally located receivers and exchange keys which they could use at a later point. Transmitting qubits at 80 MHz, the peak key rate is in excess of 20 kbps. The transmitter device fits within an envelope of <150 ml, weighs 65 g and consumes 3.15 W of power.

A study of BB84 protocol in a device-independent scenario: from the view of entanglement distillation

2013 ◽  
Vol 13 (9&10) ◽  
pp. 827-832
Author(s):  
Zhen-Qiang Yin ◽  
Wei Chen ◽  
Shuang Wang ◽  
Hong-Wei Li ◽  
Guang-Can Guo ◽  
...  
Keyword(s):  
Distribution System ◽  
Quantum Key Distribution ◽  
Distribution Systems ◽  
Real Life ◽  
Key Distribution ◽  
Secret Key ◽  
Quantum Devices ◽  
Bb84 Protocol ◽  
The Past ◽  
Entanglement Distillation

For the past few years, the security of practical quantum key distribution systems has attracted a lot of attention. Device-independent quantum key distribution was proposed to design a real-life secure quantum key distribution system with imperfect and untrusted quantum devices. In this paper, we analyzed the security of BB84 protocol in a device-independent scenario based on the entanglement distillation method. Since most of the reported loopholes are in receivers of quantum key distribution systems, we focus on condition that the transmitter of the system is perfectly coincident with the requirement of the BB84 protocol, while the receiver can be controlled by eavesdropper. Finally, the lower bound of the final secret-key rate was proposed and we explained why the secure-key rate is similar to the well-known result for the original entanglement distillation protocol.

scholarly journals Improving the Performance of Practical Quantum Key Distribution With Advantage Distillation Technology

2021 ◽  
Author(s):  
Hong-Wei Li ◽  
Chun-Mei Zhang ◽  
Mu-Sheng Jiang ◽  
Qing-Yu Cai
Keyword(s):  
Distribution System ◽  
Quantum Key Distribution ◽  
Distribution Systems ◽  
Key Distribution ◽  
Measurement Device ◽  
Transmission Distance ◽  
State Measurement ◽  
Quantum Step ◽  
State Device ◽  
Measurement Device Independent

Abstract To improve the maximal transmission distance and the maximal error rate tolerance, we apply the advantage distillation technology to analyze security of the practical decoy-sate quantum key distribution system. Based on the practical experimental parameters, the device-dependent quantum key distribution protocols and the measurement-device-independent quantum key distribution protocols have been respectively analyzed, and our analysis results demonstrate that the advantage distillation technology can significantly improve the performance of different quantum key distribution protocols. In the four-state and six-state device-dependent quantum key distribution protocols, we prove that the maximal transmission distance can be improved from 142 km to 180 km and from 146 km to 187 km respectively. In the four-state and six-state measurement-device-independent quantum key distribution protocols, we prove that the maximal transmission distance can be improved from 195 km to 273 km and from 200 km to 282 km respectively. More interestingly, the advantage distillation technology does not need to change the hardware devices about the quantum step, thus it can be conveniently to be applied in various practical quantum key distribution systems.

Modeling of Quantum Key Distribution System for Secure Information Transfer

2013 ◽  
pp. 314-342
Author(s):  
K. E. Rumyantsev ◽  
D. M. Golubchikov
Keyword(s):  
Distribution System ◽  
Quantum Key Distribution ◽  
Information Transfer ◽  
Distribution Systems ◽  
Key Distribution ◽  
Photon State ◽  
Secure Information ◽  
Sequence Production ◽  
Security Infrastructure ◽  
Processing Algorithms

This chapter is an analysis of commercial quantum key distribution systems. Upon analysis, the generalized structure of QKDS with phase coding of a photon state is presented. The structure includes modules that immediately participate in the task of distribution and processing of quantum states. Phases of key sequence productions are studied. Expressions that allow the estimation of physical characteristics of optoelectronic components, as well as information processing algorithms impact to rate of key sequence production, are formed. Information security infrastructure can be utilized, for instance, to formulate requirements to maximize tolerable error level in quantum channel with a given rate of key sequence production.

scholarly journals Synchronization in Quantum Key Distribution Systems

Cryptography ◽  
2017 ◽  
Vol 1 (3) ◽  
pp. 18 ◽  
Author(s):  
Anton Pljonkin ◽  
Konstantin Rumyantsev ◽  
Pradeep Singh
Keyword(s):  
Quantum Key Distribution ◽  
Distribution Systems ◽  
Key Distribution
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