Scheme for sharing classical information via tripartite entangled states

We investigate schemes for quantum secret sharing and quantum densecoding via tripartite entangled states. We present a scheme forsharing classical information via entanglement swapping using twotripartite entangled GHZ states. In order to throw light upon thesecurity affairs of the quantum dense coding protocol, we alsosuggest a secure quantum dense coding scheme via W state byanalogy with the theory of sharing information among involved users.