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Unconditionally secure digital signatures implemented in an eight-user quantum network

Y Pelet, Ittoop Puthoor, N Venkatachalam, S Wengerowsky, M Loncaric, SP Neumann, B Liu, Z Samec, M Stipcevic, R Ursin, E Andersson, Rarity JG, D Aktas, SK Joshi

Published Oct 3, 2022• 0 citations
Publisher
DOI
10.25405/ncl.34498830

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Abstract The ability to know and verifiably demonstrate the origins of messages can often be as important as encrypting the message itself. Here we present an experimental demonstration of an unconditionally secure digital signature (USS) protocol implemented for the first time, to the best of our knowledge, on a fully connected quantum network without trusted nodes. We choose a USS protocol which is secure against forging, repudiation and messages are transferrable. We show the feasibility of unconditionally secure signatures using only bi-partite entangled states distributed throughout the network and experimentally evaluate the performance of the protocol in real world scenarios with varying message lengths.
Wireless communication has become prominent due to its ubiquitous computing. Addressing privacy enhanced security mechanism in Wireless Mesh Networks (WMNs) is a challenging task. Classical solution to address the foresaid issue offers conditional security, which does not guarantee secure routing mechanism as it can be broken by quantum computing. In this paper, a new method is proposed which integrates quantum principles in wireless communication. Quantum Key Distribution Protocols (QKDPs) like BB84 and B92 are employed in order to establish secret key among network users, which affords unconditional security. Better security and anonymity is ensured with the use of quantum digital signatures together with pseudonym. Hence proposed protocol achieves secure privacy enhanced quantum wireless communications and also it is feasible with current technology.