International Journal of Engineering Research in Computer Science and Engineering (IJERCSE)

Monthly Journal for Science , Computer Science and Engineering

Volume4,November 2017,

Topic : Automated Generation of a Natural Challenge File for File Carving Algorithms

Authors:K. Srinivas || Dr. T. Venugopal

Abstract:File Carving is a technique of reassembling unordered mixed file fragments, without using files’ metadata such as FAT, for reconstructing the actual files present on the disk. In the areas of data recovery and digital forensics this situation arises. A challenge file consists of number of files, in the form of fragments, mixed in random order. In this paper authors have presented a software system that generates a challenge file by implementing, at user level, a file system which broadly follows FAT file system. This software system uses a large size file to store file fragments just like a kernel level file system uses disk to store files. The kernel level file system fragments the file, as per the availability of free clusters, at the time of creation of the file. By viewing the challenge file as a virtual disk, it consists of the number of virtual clusters. The software system presented in this paper, a user level file system, fragments the file, as per the availability of free clusters, on the virtual disk i.e., the challenge file. This challenge file consists of mixed file fragments of number of user files. The content of the challenge file is a result of software module which broadly follows FAT file system. The challenge file thus generated is, therefore a natural challenge file. This challenge file provides the writers of file carving algorithms a platform to test their algorithms. The designers of file carvers can use the challenge file conveniently as a virtual disk, in place of the actual disk, thus eliminating the need of physical hard disk for testing their algorithms. There are number of other benefits of this approach as outlined in this paper.

Keywords: File carving; file system; challenge file; digital forensics; data recovery

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DOI: 01.1617/vol4/iss11/pid94306

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Thomson Reuters ID : q-6288-2016.
ORCiD Research ID : 0000-0001-9540-6799

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Journal Code : IJERCSE
Electronic ISSN : 2394-2320
Impact Factor : 4.890
Frequency : monthly
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