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Author(s): P.Thiyagarajan | G.Aghila | V. Prasanna Venkatesan

Journal: Signal & Image Processing
ISSN 2229-3922

Volume: 2;
Issue: 4;
Start page: 201;
Date: 2012;
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Keywords: Image Steganography | Steganalysis | Forensics Examiner | LSB | RGB | HSI | Stego-Images

The major threat in cyber crime for digital forensic examiner is to identify, analyze and interpret theconcealed information inside digital medium such as image, audio and video. There are strong indicationsthat hiding information inside digital medium has been used for planning criminal activities. In this way, itis important to develop a steganalysis technique which detects the existence of hidden messages insidedigital medium. This paper focuses on universal image steganalysis method which uses RGB to HSI colourmodel conversion. Any Universal Steganalysis algorithm developed should be tested with various stegoimagesto prove its efficiency. The developed Universal Steganalysis algorithm is tested in stego-imagedatabase which is obtained by implementing various RGB Least Significant Bit Steganographic algorithms.Though there are many stego-image sources available on the internet it lacks in the information such ashow many rows has been infected by the steganography algorithms, how many bits have been modified andwhich channel has been affected. These parameters are important for Steganalysis algorithms and it helpsto rate its efficiency. Proposed Steganalysis using Colour Model has been tested with our Image Databaseand the results were affirmative.
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