Quantum Anonymous Veto protocol (original) (raw)

Anonymous Veto (AV) and Dining cryptographers (DC) are two basic primitives for the cryptographic problems that can hide the identity of the sender(s) of classical information. They can be achieved by classical methods and the security is based on computational hardness or requires pairwise shared private keys. In this regard, we present a secure quantum protocol for both DC and AV problems by exploiting the GHZ correlation. 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 problem. Security of both the protocols rely on some novel and fundamental features of the GHZ correlation known as GHZ paradox.