For the purpose of guaranteeing convenience secure communication between police mobile and servers, this paper studies the design of audio steganography and its application in police mobile secure communication based on speech interaction, because of the imperceptible charater of audio steganography and convenient and fast of speech interaction. And it proposes an improved audio steganography method. Original signal is segmented by hamming function. Redundant interval is determined by short-time energy. Embedding interval is decideded, according to redundant interval and statistic data, then embed steganography information. Simulation experiment shows the excellent subjective imperceptibility of the audio steganography method. On this basis, the audio steganography method is applied in police mobile secure communication based on speech interaction. This kind of secure communication model based on this method is proposed and related experimental results show the correctness and feasibility of the model.%音频隐写不会引起人的听觉感知,且语音具有交互方便、快捷的特点.为保障管用移动终端与服务器之间安全方便地通信,探讨音频隐写方法的设计,及其在基于语音交互的警用移动终端安全通信中的应用,提出一种改进的音频隐写方法.该方法用汉明窗函数对原始信号分帧,根据计算的短时能量确定冗余区间,结合统计经验及滞后掩蔽效应确定嵌入区间,顺序嵌入信息.模拟实验结果表明,该音频隐写方法具有良好的主观不可感知性,且基于该方法的通信模式是正确可行的.
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