  A deterministic direct quantum communication protocol by using swapping
quantum entanglement and local unitary operations is proposed in this paper. A
set of ordered EPR pairs in one of the four Bell states is used. For each pair,
each of the two legitimate users owns a photon of the entangled pair via
quantum channel. The pairs are divided into two types of group, i.e., the
checking groups and the encoding-decoding groups. In the checking groups,
taking advantage of the swapping quantum entanglement and Alice's (the message
sender's) public announcement, the eavesdropping can be detected provided that
the number of the checking groups is big enough. After insuring the security of
the quantum channel, Alice encodes her bits via the local unitary operations on
the encoding-decoding groups. Then she performs her Bell measurements on her
photons and publicly announces her measurement results. After her announcement,
the message receiver Bob performs his Bell measurements on his photons and
directly extracts the encoding bits by using the property of the quantum
entanglement swapping. The security of the present scheme is also discussed:
under the attack scenarios to our best knowledge, the scheme is secure.
