Secret Keys from Parity Bits in the Satellite Setting

Jari Lietzén, Olav Tirkkonen, Roope Vehkalahti

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

1 Citation (Scopus)
24 Downloads (Pure)


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 ParityCheck 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.

Original languageEnglish
Title of host publication2022 IEEE International Symposium on Information Theory, ISIT 2022
Number of pages6
ISBN (Electronic)978-1-6654-2159-1
Publication statusPublished - 2022
MoE publication typeA4 Conference publication
EventIEEE International Symposium on Information Theory - Espoo, Finland
Duration: 26 Jun 20221 Jul 2022

Publication series

NameIEEE International Symposium on Information Theory
ISSN (Print)2157-8095
ISSN (Electronic)2157-8117


ConferenceIEEE International Symposium on Information Theory
Abbreviated titleISIT


  • secret key agreement
  • source model


Dive into the research topics of 'Secret Keys from Parity Bits in the Satellite Setting'. Together they form a unique fingerprint.

Cite this