03-02-2011, 09:30 PM
The methods of detecting the use of steganography also developing with the techniques for steganography are growing rapidly. the general purpose of Steganalysis is to collect sufficient statistical evidence about the presence of hidden messages in images,The Steganalysis attacks attacks can be of the following types:
-aural: the significant parts of a digital content is stripped away so that the human percepton is facilitated.A common method is to show the LSB of the image.
-structural:in certain cases, the the format of the digital file is changed when the hidden information is embedded in the iamge. But this leaves behind an easily detectable pattern in the structure of the file. This can be used to detect the message.
- statistical
Digital pictures of natural scenes have distinct statistical behavior. The image can be checked for alteration using the proper statistical analysis. Thus the forgeries are made mathematically detectable.
LIMITATIONS OF STEGANOFGRAPHY
The limitations of steganography are caused due to the medium used to hide the data. The major changes to the original file should be avoided. Thus only limited room is left for the user to embed the message.
STEGANALYSIS-DETECTING STEGANOGRAPHY.pdf (Size: 169.9 KB / Downloads: 191)