即时通讯音频信道载波传输研究

即时通讯工具在带给公众信息交流便利的同时也成为信息泄露的重要源头。为了提高信息的安全性，采用以即时通讯工具为平台，利用其音频信道进行数字载波信号传送，将相对重要的信息调制到载波上进行发送，接收时再通过解调完成信息的接收。实验中调制和解调采用了二进制差分相移键控方式。将二进制码元信息调制后在腾讯QQ的音频信道中进行传输，接收端成功接收并解调还原出码元信息。通过实验证明了该方法的可行性。

Instant Messaging Audio Channel Carrier Transmission

Instant messaging tool is an important source of information leakage, while bringing much con- venience to the public for their information exchange. In order to improve the security of information and with instant communication tool as the platform, the audio channel is used to transmit digital carrier signal, the relatively important information modulated to the carrier for transmission, and the receiving of complete information finished through demodulation. Experiments of modulation and demodulation is done by using the binary differential phase shift keying method. After meta information modulation, the binary code is transmitted in Tencent QQ audio channel, while in the receiving end, the binary code is successfully re- ceived and demodulated. The experiment indicates the feasibility of this method.