Conference Key Agreement from Secret Sharing

Colin Boyd

Frederik Hahn, Jarn de Jong, Anna Pappa

Conference key agreement (CKA) is a cryptographic effort of multiple parties to establish a shared secret key.In future quantum networks, generating secret keys in an anonymous way is of tremendous importance for parties that want to keep their shared key secret and at the same time protect their own identity.We provide a definition of anonymity for general protocols and present a CKA protocol that is provably anonymous under realistic adversarial scenarios.We base our protocol on shared Greenberger-Horne-Zeilinger states, which have been proposed as more efficient resources for CKA protocols, compared to bipartite entangled resources.The existence of secure and anonymous protocols based on multipartite entangled states provides a new insight on their potential as resources and paves the way for further applications.

孝也 栃窪

Frederik Hahn, Jarn de Jong, Christopher Thalacker +3 more

Quantum Conference Key Agreement (CKA) is a cryptographic effort of multiple parties to establish a shared secret key. While bipartite quantum key distribution protocols are also useful in the context of CKA, multipartite protocols allow for a more efficient generation of the necessary correlations and are therefore viewed favorably in the context of quantum networks. In future quantum networks, generating secret keys in an anonymous way is of tremendous importance for parties that do not only want to keep their shared key secret but also protect their own identity, e.g. in the context of whistle-blowing. In this paper we provide the first protocol for Anonymous Quantum Conference Key Agreement and demonstrate it using four-photon Greenberger-Horne-Zeilinger ($\mathrm{GHZ}$) states.

Benjamin Fisher, Tyler Stowell, J. Gabriel Richardson +7 more

Quantum Conference Key Agreement (QCKA) allows a group of users to establish a shared secret key. We describe the experimental characterization of a “Green Machine” photonic integrated circuit (PIC) and its simulated performance in QCKA.

Himanshu Tyagi, Shun Watanabe