An asymmetric dynamic multiparty quantum secret sharing against active attacks

Abstract

We propose a dynamic quantum secret sharing (DQSS) protocol based on traveling single-qubits where any number of players can join or leave the protocol according to the dealer’s and players’ will. The protocol can resist collusion attacks of dishonest players by using an honesty test based on some unambiguous unitary operations. Specifically, the proposed protocol is secure against active attacks from dishonest players, which is different from existing protocols that consider only passive attacks based on the assumption that players are honest but curious. By using the asymmetric strategy, the efficiency of our DQSS protocol can be made asymptotically close to 100%. Compared with previous DQSS protocols, our protocol is securer, more efficient and more practical.