Dynamic Multiparty Quantum Secret Sharing With a Trusted Party Based on Generalized GHZ State

This paper proposes a dynamic multiparty to quantum secret sharing scheme, where two distant groups of participants can share the common secrets. In our present trusted third party is required reliably prepare all resources. Each agent only needs perform local unitary operations or single-particle measurement completing process sharing. Secret be recovered if agents cooperate each other. Furthermore, new added deleted from current scheme with help party. Finally, security analysis shows that resist various attacks. Compared former existing researches, more efficient in real application.