Anonymity in networked communication is vital for many privacy-preserving tasks. Secure key distribution alone is insufficient for high-security communications. Often, knowing who transmits a message to whom and when must also be kept hidden from an adversary. Here, we experimentally demonstrate five information-theoretically secure anonymity protocols on an eight user city-wide quantum network using polarisation entangled photon pairs. At the heart of these protocols is anonymous broadcasting, which is a cryptographic primitive that allows one user to reveal one bit of information while keeping their identity anonymous. For a network of n users, the protocols retain anonymity for the sender, given that no more than n − 2 users are colluding. This is an implementation of genuine multi-user cryptographic protocols beyond standard QKD. Our anonymous protocols enhance the functionality of any fully-connected Quantum Key Distribution network without trusted nodes.

Experimental implementation of secure anonymous protocols on an eight-user quantum key distribution network / Huang, Zixin; Joshi, Siddarth Koduru; Aktas, Djeylan; Lupo, Cosmo; Quintavalle, Armanda O.; Venkatachalam, Natarajan; Wengerowsky, Sören; Lončarić, Martin; Neumann, Sebastian Philipp; Liu, Bo; Samec, Željko; Kling, Laurent; Stipčević, Mario; Ursin, Rupert; Rarity, John G.. - In: NPJ QUANTUM INFORMATION. - ISSN 2056-6387. - 8:1(2022). [10.1038/s41534-022-00535-1]

Experimental implementation of secure anonymous protocols on an eight-user quantum key distribution network

Lupo, Cosmo;
2022-01-01

Abstract

Anonymity in networked communication is vital for many privacy-preserving tasks. Secure key distribution alone is insufficient for high-security communications. Often, knowing who transmits a message to whom and when must also be kept hidden from an adversary. Here, we experimentally demonstrate five information-theoretically secure anonymity protocols on an eight user city-wide quantum network using polarisation entangled photon pairs. At the heart of these protocols is anonymous broadcasting, which is a cryptographic primitive that allows one user to reveal one bit of information while keeping their identity anonymous. For a network of n users, the protocols retain anonymity for the sender, given that no more than n − 2 users are colluding. This is an implementation of genuine multi-user cryptographic protocols beyond standard QKD. Our anonymous protocols enhance the functionality of any fully-connected Quantum Key Distribution network without trusted nodes.
2022
Experimental implementation of secure anonymous protocols on an eight-user quantum key distribution network / Huang, Zixin; Joshi, Siddarth Koduru; Aktas, Djeylan; Lupo, Cosmo; Quintavalle, Armanda O.; Venkatachalam, Natarajan; Wengerowsky, Sören; Lončarić, Martin; Neumann, Sebastian Philipp; Liu, Bo; Samec, Željko; Kling, Laurent; Stipčević, Mario; Ursin, Rupert; Rarity, John G.. - In: NPJ QUANTUM INFORMATION. - ISSN 2056-6387. - 8:1(2022). [10.1038/s41534-022-00535-1]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/236198
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