Inspired by quantum secure direct communication, a three-party quantum secret sharing approach is proposed. In the preparation phase, the sender shares a GHZ state among users. After she ensures about the security of the channel, she generates an auxiliary GHZ state and keeps it. Then she encodes three-bit information on the GHZ states, by applying the appropriate gates on her qubits. In the decoding phase, the three parties measure their qubits. The receivers achieve no information on the encoded message individually and just when they know the others' measurement results have access to the secret message. The security of the preparation phase against various attacks is investigated. Since no qubits carrying the message are transmitted, the protocol is completely secure, if the perfect quantum channel is used. The proposed approach has a better efficiency as compared to the previous ones.Theory of quantum computation and information [1][2][3][4], as a new researching field, is constituted by quantum mechanics, computer sciences and the theory of classical information. It leads to astonishing developing in various fields of processing and transmitting of information.Quantum cryptography [5, 6] is one of the significant branches in quantum information field. Quantum cryptography begins with discovering of quantum key distribution. In 1984, Bennett and Brassard [7], proposed the first quantum key distribution protocol, BB84, with "unconditional security". Quantum secret sharing (QSS) [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22], that combines quantum mechanics and classical cryptography, is another important class of quantum cryptography. In quantum secret sharing, the sender, Alice is not certain about the honesty of her receivers, Bob and Charlie, and she does not know which one is not honest. So the secret message is not transmitted directly to the users. It is divided into two encoded parts and then transmitted to different users such that none of them can option no information about the shared secret. The secret message is accessible, if two users are cooperated. Many researches have been carried out after the first QSS protocol, called HBB99, was proposed by Hillery, Buźek and Berthiaume [8] in 1999. Proposed protocols have used different quantum states, such as single qubits [9-11], EPR 1 pairs [12-17] and GHZ 2 states [8, 18-22]. HBB99 protocol transmits single-bit classical message by GHZ state. Then L. Xiao et al. [18] proposed a protocol, called XLDP04 which improved the efficiency of HBB99 protocol. J. Wang et al. [20] presented multiparty quantum secret sharing using quantum secure direct communication that improved the efficiency of XLDP04 protocol. J. Wang et al. protocol transmits one secret message bit, by sharing GHZ state among users and producing one auxiliary qubit. After that, Y. Liu et al.[21] proposed another QSS protocol using quantum secure direct communication that improved the efficiency of J. Wang et al. protocol. In this scheme, by sharing GHZ state and producing an auxil...
