【摘要】 H.264是一个面向未来IP和无线网络的视频编码标准,应用范围越来越广泛,因而安全加密技术逐步成为研究的热点。论文针对H.264的特点,提出一种利用数据加密标准DES的输出反馈模式OFB对H.264少量视频数据进行加密的算法,所选取的数据来自于DCT变换后的DC及部分AC系数。理论分析和实验结果表明,该算法选择加密部分视频数据,减小了加密的数据量,从而降低了加密系统的计算复杂度,具有较快的加解密速度,提高了实时性和安全性,且适合于移动多媒体、无线多媒体网络的数据流的安全传送。更多还原

【Abstract】 H.264 is a kind of video coding standard oriented to future IP and wireless networks. As H.264 is applied in many aspects,its security has become a research focus. According to the features of H.264,this paper proposes a video encryption algorithm,which is based on DES(Data Encryption Standard) OFB(Output Feedback) mode,encrypts only small parts of the video data. The encrypted data is composed of DC and part of AC coefficient transformed by DCT. Theoretical analysis and experimental results indicate,this algorithm selects parts of video data,and decrease the complexity of this system. So it has a faster speed,improves security,and is suitable for secure transfer of data stream on mobile multimedia and wireless network.更多还原