多媒体文件内容加密保护的方法研究探讨
首发时间:2003-10-26
摘要:本文探讨了两种对多媒体文件进行加密的方法,全文件加密和格式加密方法,并比较了两种方法的优缺点;对加密多媒体文件的播放,作者通过对DirectShow技术体系结构的分析,提出了一种实现对加密多媒体文件播放的新方法。该方法通过编写新的源滤波器,对加密多媒体文件进行解密操作,使之成为系统可辨识的多媒体格式,并利用Windows系统自带的Media Player进行播放。这种方法大大降低了软件开发的成本、时间和难度。
关键词: 加密 解密 DirectShow 滤波器
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Study of The Encrypt Protection of Multimedia FileContent
Abstract:This paper discussed two encrypting methods of multimedia files, all-file-encrypting and format-encrypting, and compared the two methods. Discussing the construct of DirectShow technology system, this paper put forward a new method which realizes the playing back of encrypted multimedia content. Building up a new source filter, we decrypt the encrypted multimedia files. Then they can be played using Media Player, which is a built-in part of Windows system. Using this method, the expense and difficulty of software development can be reduced.
Keywords: Encrypt Decrypt DirectShow Filter
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