Reference : Revisiting Deniability in Quantum Key Exchange via Covert Communication and Entanglem...
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Physical, chemical, mathematical & earth Sciences : Physics
Engineering, computing & technology : Computer science
Computational Sciences; Security, Reliability and Trust
Revisiting Deniability in Quantum Key Exchange via Covert Communication and Entanglement Distillation
Atashpendar, Arash mailto [University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT) > >]
Policharla, Guru Vamsi [Indian Institute of Technology Bombay, India > Department of Physics]
Roenne, Peter [University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT) > >]
Ryan, Peter [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Computer Science and Communications Research Unit (CSC) >]
Secure IT Systems, 23rd Nordic Conference, NordSec 2018. Lecture Notes in Computer Science, vol 11252. Springer, Cham
The 23rd Nordic Conference on Secure IT Systems (NordSec 2018)
28-11-2018 to 30-11-2018
[en] Deniability ; Quantum Key Exchange ; Covert Quantum Communication ; Quantum Entanglement Distillation ; View Indistinguishability ; Quantum Cryptography ; Covert Quantum Key Exchange ; Key Equivocation ; Deniable Key Exchange
[en] We revisit the notion of deniability in quantum key exchange (QKE), a topic that remains largely unexplored. In the only work on this subject by Donald Beaver, it is argued that QKE is not necessarily deniable due to an eavesdropping attack that limits key equivocation. We provide more insight into the nature of this attack and how it extends to other constructions such as QKE obtained from uncloneable encryption. We then adopt the framework for quantum authenticated key exchange, developed by Mosca et al., and extend it to introduce the notion of coercer-deniable QKE, formalized in terms of the indistinguishability of real and fake coercer views. Next, we apply results from a recent work by Arrazola and Scarani on covert quantum communication to establish a connection between covert QKE and deniability. We propose DC-QKE, a simple deniable covert QKE protocol, and prove its deniability via a reduction to the security of covert QKE. Finally, we consider how entanglement distillation can be used to enable information-theoretically deniable protocols for QKE and tasks beyond key exchange.

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