  A novel scheme for secure direct communication between Alice and Bob is
proposed, where there is no need for establishing a shared secret key. The
communication is based on Einstein-Podolsky-Rosen pairs and teleportation
between Alice and Bob. After insuring the security of the quantum channel (EPR
pairs), Bob encodes the secret message directly on a sequence of particle
states and transmits them to Alice by teleportation. In this scheme
teleportation transmits Bob's message without revealing any information to a
potential eavesdropper. Alice can read out the encoded messages directly by the
measurement on her qubits. Because there is not a transmission of the qubit
which carry the secret message between Alice and Bob, it is completely secure
for direct secret communication if perfect quantum channel is used.
