中文摘要：

改进了前期提出的基于即时通信软件的隐蔽通信模型,提出了自适应的套接字函数截获方法,通过挂接Bol SipPhone的语音流进行了实现,并提出了基于套接字函数的Bol SipPhone语音流识别方法。研究分析了其语音流中G.723.1的LSF参数最不重要比特位（LSB）,利用LSB替换的方法实现了信息隐藏。实验结果表明,提出的自适应截获方法和语音流识别方法能够适用于现有的即时通信软件,拓宽了基于流媒体的信息隐藏的应用范围,具有良好的发展前景。

英文摘要：

This paper improved the previous stegnographic model based on instant communication software by proposing an adaptive intercepted method based on sockets functions,and which was implemented by hooking the flow of Bol SipPhone speech.Then proposed the speech identification method based on sockets functions for Bol SipPhone,and studied the least significant bits（LSB） in the LSF parameters of G.723.1,at last inplemented the stegnography based on Bol SipPhone by LSB substitution method.Experimental results show that the methods of adaptive intercepted sockets functions and speech recognition can be generally applied in the instant communication softwares,which broaden the scope of application for information hiding based on the streaming media and have good prospects for development.