Nonclassical Attack on a Quantum Key Distribution System

Abstract

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.

Extending OTDR Distance Span by External Front-End Optical Preamplifier

“…Finally, in an OTDR based sensor system, using EDFA has created an experimental knowledge base regarding gain, insertion loss, and pumping configurations, which would be worth merging with the analytical model derived here [30][31][32][33][34].…”

Network-Compatible Unconditionally Secured Classical Key Distribution via Quantum Superposition-Induced Deterministic Randomness

“…The more information traffic increases, the more data security should be emphasized. Current information security relies on computational complexity [2] and is thus vulnerable to both classical [3] and quantum attacks [4][5][6]. In classical cryptography such as public key cryptography [7], the key length has gradually increased over decades to protect data from potential eavesdropping, mostly relying on computing power [8].…”

Magnetic Carbon Nanofiber Mats for Prospective Single Photon Avalanche Diode (SPAD) Sensing Applications

“…Magnetic nanofibers are of great interest for basic research of their magnetic properties as well as for possible applications in spintronics, neuromorphic computing and data transfer [ 21 , 22 , 23 ]. Secure data transfer is of great interest nowadays and requires effective strategies [ 24 , 25 ]. For some kinds of applications, nanofiber mats with agglomeration and beads are advantageous because magnetic nanoparticles collect in beads and thus form a network with nodes [ 2 ].…”

“…In our previous study by Döpke et al, PAN/magnetite nanofiber mats were prepared and the magnetic properties were investigated [ 2 ]. Here, networks of magnetic nanofibers with beads that can be used to transport data in the form of domain walls moving along them and combined with objects that could be used to store data and transport [ 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 …”