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In today's world is a modern information world, in order to adapt to the change constantly battlefield environment high requirement for secure information communication, based on watermark detection technology in the research on spread spectrum watermark information generated by the secret key, followed by the wavelet transform of the modulated watermark information is embedded in the operation. The receiver uses the reverse operation of the encrypted information is demodulated to restore the computer after detection, realize the secret information transmission. The simulation results show that the proposed scheme can effectively realize the covert transmission of information. It has good security and robustness to clipping attacks.