A Two-way QKD Protocol Outperforming One-way Protocols at Low QBER

Lietzén, Jari; Vehkalahti, Roope; Tirkkonen, Olav

doi:10.1109/isit44484.2020.9174522

Cited by 4 publications

(7 citation statements)

References 16 publications

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“…A notable example of symmetric key distribution to produce and distribute secret keys is quantum key distribution (QKD) setting [7], [14], [23], [29]. In QKD the nonorthogonal states of a quantum system provide correlated observations of randomness for end users [23].…”

Section: A Related Workmentioning

confidence: 99%

Secret Key Generation Between Ambient Backscatter Devices

Lietzén

Tirkkonen

2023

IEEE Access

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We analyze secret key generation between ambient backscatter devices where the channel between an ambient transmitter and the backscatter devices is used as a source of randomness. The devices do not need to estimate or measure the channel between themselves, which greatly simplifies the gathering of raw key material. We analyze the eavesdropper's mutual information based on fundamental principles and apply privacy amplification to remove any information that the eavesdropper overheard during the error correction phase. We show how the legitimate users can estimate the eavesdropper's knowledge and trade off between achievable key rate and the eavesdropper's knowledge of the final key. When modeling the channel between the ambient transmitter and the backscatter devices using state-of-the-art 3GPP channel models we show that even in non-line-of-sight channels the distance from legitimate users to an eavesdropper being larger than a few wavelengths is not alone a sufficient security guarantee. This is in contrast with previous secret key generation methods where distance is assumed to prevent the eavesdropper from having any information about the key prior to error correction. Our simulations show that a distance based approach is too optimistic and there is a possibility that the eavesdropper still knows a substantial part of the final key. INDEX TERMSSecret key generation, physical layer security, ambient backscatter communication.

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Section: A Related Workmentioning

confidence: 99%

Secret Key Generation Between Ambient Backscatter Devices

Lietzén

Tirkkonen

2023

IEEE Access

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“…We present a key growing protocol; Alice and Bob start with some existing secret key. A similar protocol was discussed in [15] in a QKD setting. In the source model setting, the key rate analysis, and thus the privacy amplification step changes completely.…”

Section: Advantage Distillation With Secret Keys From Parity Bitsmentioning

confidence: 99%

“…Step 9 are fed to the protocol and the protocol terminates after a predetermined number of rounds, after which round M + 1 is separately treated.With M = 1 the protocol is similar to the QKD protocol of [11]. The distinct difference to the QKDprotocols [11], [15] is in Step 8, which will be addressed next.…”

Section: Correct Parity Bitmentioning

confidence: 99%

“…Two-way key distillation has been widely considered in the context of Quantum Key Distribution (QKD), where Alice and Bob may assume that all errors on the channel are caused by deliberate action of Eve. In [15] we introduced a two-way key distillation protocol for QKD, where secret keys were created by correcting parity bits. We showed that the considered twoway protocol generates considerably more secret key than any one-way protocol, under the restricted individual attack model.…”

Section: Introductionmentioning

confidence: 99%

“…In TPPR, parity checking is used for advantage distillation as in PCP [6], [12], but instead of discarding parity bits after each advantage distillation round, key bits are collected from error corrected parity bits. The steps of the protocol analyzed here are the same as in the QKD case [15], but the underlying privacy amplification analysis, and accordingly the resulting key rate differs drastically between the QKD and satellite setting. We perform complete information theoretical security analysis of TPPR in the classical communication setting when Alice and Bob correct all parity bits in secret.…”

Section: Introductionmentioning

confidence: 99%

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Secret Keys from Parity Bits in the Satellite Setting

Lietzén¹,

Tirkkonen²,

Vehkalahti

2022

2022 IEEE International Symposium on Information Theory (ISIT)

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We consider a two-way secret key distribution protocol in the satellite setting, where Alice, Bob and Eve each decode bits from noisy signals received from a source in their environment. Alice and Bob perform advantage distillation to find a secret key. We apply a Two-way Protocol with Parity bit Reconciliation (TPPR) where secret keys are collected from parity bits in course of advantage distillation, not only from the final distilled bits. We analyze the mutual information acquired by Eve from exploiting the original eavesdropped information together with the information leaked during the distillation protocol, as well as TPPR secret key rate. Comparing to the Parity-Check Protocol (PCP) known in the literature, TPPR provides complementary performance. In operation regions where PCP fare badly as compared to one-way protocols, TPPR provides gains in key rate.

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