文章选取Logistic 映射和Chen 映射两种混沌算法对IPTV 系统中的音频和图像进行加密分析，给出了音频信号的两种混沌映射加密过程，构建了初值和调制压缩系数两个混沌密钥。接着对图像信号采用了两种混沌映射的加密方法，对比分析了两种算法在密钥量、敏感性、时间复杂度等方面的性能。最终确定以Logistic 与Chen 映射两种组成复合映射，生成二重密钥，对音频和图像进行加密，为IPTV系统在互联网中的传输提供安全保障。

Based on the chaotic Logistic map and Chen map, this paper analyzes the encryption of audios and images in the IPTV system, proposes two chaotic encryption process of audio signal, and obtains the two chaotic keys of the initial value and the compression coefficient. Then it uses the two chaotic encryption methods in image signal, and compares the performance of two algorithms in terms of secret key amount, sensitivity, time complexity and so on. Ultimately, a new complex map is synthesized by Logistic map and Chen map, double keys are generated to encrypt the audio and image signals, so as to provide security for the transmission of IPTV programs in the internet.