Abstract
We propose an experimentally feasible scheme for implementing controlled quantum secure direct communication by using a five-atom cluster state in cavity QED. According to the results measured by the sender and the controller, the receiver can obtain different secret messages in a deterministic way with unit successful probability. In the communication processes, one only need separate measurements with the assistance of a strong classical driving field. In addition, the scheme is insensitive to the cavity decay and the thermal field.
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