Analysis of coherent quantum cryptography protocol vulnerability to an active beam-splitting attack

Kronberg, D. A.; Kiktenko, Evgeniy O.; Fedorov, Aleksey K.; Kurochkin, Y. V.

doi:10.1070/qel16240

Cited by 10 publications

(3 citation statements)

References 32 publications

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“…Protocols that fall under this category include Coherent One-Way protocols [6][7][8]30], early versions of the Differential Phase Shift protocols [31,32], Strong Reference B92 protocols [33][34][35] and Y-00 protocols [36,37]. The full security proof includes analysis of a general coherent attack, but to upper-bound the key generation rate in these protocols, we may consider the beam-splitting (BS) attack [38][39][40], in which Eve steals the portion of the signal expected to be lost in the line and then retransmits the remaining part to Bob through an ideal channel.…”

Section: Analysis Schemementioning

confidence: 99%

Boosting Quantum Key Distribution via the End-to-End Loss Control

Kodukhov

Kirsanov

et al. 2023

Cryptography

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With the rise of quantum technologies, data security increasingly relies on quantum cryptography and its most notable application, quantum key distribution (QKD). Yet, current technological limitations, in particular, the unavailability of quantum repeaters, cause relatively low key distribution rates in practical QKD implementations. Here, we demonstrate a remarkable improvement in the QKD performance using end-to-end line tomography for the wide class of relevant protocols. Our approach is based on the real-time detection of interventions in the transmission channel, enabling an adaptive response that modifies the QKD setup and post-processing parameters, leading, thereby, to a substantial increase in the key distribution rates. Our findings provide everlastingly secure efficient quantum cryptography deployment potentially overcoming the repeaterless rate-distance limit.

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Section: Analysis Schemementioning

confidence: 99%

Boosting Quantum Key Distribution via the End-to-End Loss Control

Kodukhov

Kirsanov

et al. 2023

Cryptography

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“…Note that, in recent works [60][61][62][63], generalizations of the beam splitting attack for the B92, COW, and DPS protocols are considered. In these generalizations, the adversary can change the intensity of states and their further actions depend on whether they has managed to extract information from the part of the state diverted by the beam splitter.…”

Section: Beam Splitting Attackmentioning

confidence: 99%

Security of the decoy state method for quantum key distribution

Trushechkin,

Kiktenko,

Kronberg

et al. 2021

Preprint

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Quantum cryptography or, more precisely, quantum key distribution (QKD), is one of the advanced areas in the field of quantum technologies. The confidentiality of keys distributed with the use of QKD protocols is guaranteed by the fundamental laws of quantum mechanics. This paper is devoted to the decoy state method, a countermeasure against vulnerabilities caused by the use of coherent states of light for QKD protocols whose security is proved under the assumption of single-photon states. We give a formal security proof of the decoy state method against all possible attacks. We compare two widely known attacks on multiphoton pulses: photon-number splitting and beam splitting. Finally, we discuss the equivalence of polarization and phase coding.

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“…Examples include, in particular, the distributed-phase-reference (DPR) approach [11][12][13][14][15][16][17][18][19], specifically, differential-phase-shift [11][12][13][14][15] and COW [16][17][18][19] QKD protocols. A general security proof of DPR-QKD in a realistic setting has been missing, and only particular cases have been considered [20][21][22][23][24][25][26][27][28]. This problem has been recently generally resolved, and lower bounds for a special variant of the COW protocol have been obtained [29].…”

Section: Introductionmentioning

confidence: 99%

Quantum soft filtering for the improved security analysis of the coherent one-way quantum-key-distribution protocol

et al. 2020

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A precise security analysis of practical quantum key distribution (QKD) systems is an important step for improving their performance. Here we consider a class of quantum soft filtering operations, which generalizes the unambiguous state discrimination (USD) technique. These operations can be applied as a basis for a security analysis of the original coherent one-way (COW) QKD protocol since their application interpolates between beam-splitting (BS) and USD attacks. We demonstrate that a zero-error attack based on quantum soft filtering operations gives a larger amount of the information for Eve at a given level of losses. We calculate the Eve information as a function of the channel length. The efficiency of the proposed attack highly depends on the level of the monitoring under the maintenance of the statistics of control (decoy) states, and best-case results are achieved in the case of the absence of maintenance of control state statistics. Our results form additional requirements for the analysis of practical QKD systems based on the COW QKD protocol and its variants by providing an upper bound on the security.

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Analysis of coherent quantum cryptography protocol vulnerability to an active beam-splitting attack

Cited by 10 publications

References 32 publications

Boosting Quantum Key Distribution via the End-to-End Loss Control

Boosting Quantum Key Distribution via the End-to-End Loss Control

Security of the decoy state method for quantum key distribution

Quantum soft filtering for the improved security analysis of the coherent one-way quantum-key-distribution protocol

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