Flicker Forensics for Pirate Device Identification
Flicker Forensics for Pirate Device Identification
复制标题
用于盗版设备识别的闪烁取证
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
G. Doërr
中科院分区：
文献类型：
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作者：
Adi Hajj;Séverine Baudry;B. Chupeau;G. Doërr
基于密码的内容保护是在传输过程中保护多媒体内容的有效手段。然而，内容最终在呈现时被解密，使其容易受到盗版的影响，例如使用摄像机来记录在LCD屏幕上显示的电影。由于呈现设备和获取设备之间的相互作用，这种类型的盗版自然会在盗版视频中留下可见的闪烁信号。这种闪烁的参数固有地依赖于盗版设备的特性，例如LCD屏幕的背光和摄像机的读出时间。在这篇文章中，我们介绍了一种法医方法来估计这些参数，通过分析闪烁信号存在于盗版录音。实验结果清楚地表明，这些估计技术的准确性提供了有效的手段，告诉故事的设备已被用于盗版感谢消费电子制造商使用的各种工厂设置。
Cryptography-based content protection is an efficient means to protect multimedia content during transport. Nevertheless, content is eventually decrypted at rendering time, leaving it vulnerable to piracy e.g. using a camcorder to record movies displayed on an LCD screen. Such type of piracy naturally imprints a visible flicker signal in the pirate video due to the interplay between the rendering and acquisition devices. The parameters of such flicker are inherently tied to the characteristics of the pirate devices such as the back-light of the LCD screen and the read-out time of the camcorder. In this article, we introduce a forensic methodology to estimate such parameters by analyzing the flicker signal present in pirate recordings. Experimental results clearly showcase that the accuracy of these estimation techniques offers efficient means to tell-tale which devices have been used for piracy thanks to the variety of factory settings used by consumer electronics manufacturers.