GHZ correlation provides secure Anonymous Veto Protocol
This work addresses the need for secure anonymous communication in cryptography, offering a novel quantum approach that could enhance privacy in applications like voting or messaging, though it is incremental as it builds on existing classical primitives.
The authors tackled the problem of hiding sender identities in cryptographic protocols like Anonymous Veto and Dining Cryptographers by developing a quantum protocol using GHZ correlations, resulting in a secure solution based on quantum nonlocality without relying on computational hardness or shared private keys.
Anonymous Veto (AV) and Dining cryptographers (DC) are two basic primitives for the cryptographic problems where the main aim is to hide the identity of the senders of the messages. These can be achieved by classical methods where the security is based either on computational hardness or on shared private keys. In this regard, we present a secure quantum protocol for both DC and AV by exploiting the GHZ correlations. We first solve a generalized version of the DC problem with the help of multiparty GHZ state. This allow us to provide a secure quantum protocol for the AV. Securities for both the protocols rely on some novel and fundamental features of GHZ correlations related to quantum nonlocality.