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Abstract
We have analyzed histogram of movie files formats like mp4, avi and mkv. Three file formats are a major part of movie files which deal in on and off line as digital contents. In digital forensics, file format identification is very important. When one traces the illegal trade of digital contents, the format of digital contents provides important clues. The widely known methods to identify a file format use metadata like magic number or magic byte in the file. But we do identify file formats under no present of metadata by histogram analysis.
1. Introduction
File type detection methods can be categorized into three kinds: extension-based, magic bytes-based, and content-based methods and none of them are comprehensive enough to satisfy all the requirements [1]. The easiest method of file format detection is the extension-based method. The Microsoft's operating systems use such approach almost exclusively. All the file types, at least in the Windows-based systems, are generally accompanied by an extension. This approach can be applied to both binary and text files. However, it has a great vulnerability while it can be easily spoofed by a simple file renaming.
The second method of file format detection that is devoted to the binary files is based on the magic bytes. The magic bytes are some predefined signatures in the header or trailer of binary files. A file header is the first portion of a computer file that contains metadata. Metadata is the background information that describes the content, quality, condition, and other appropriate characteristics of the data. The file header contains necessary information for the corresponding application to recognize and understand the file.
The third method...