Steganography in Ubuntu/ Debian: Hiding data in images and audio files

Thursday, 17 December 2009 05:46 Joby Joseph How to ? - Linux

steganography is the technique used for hiding various data in different type of image and audio files with out changing the basic characteristics of file. Steghide is a utility for steganography. The color- respectivly sample-frequencies are not changed thus making the embedding resistant against first-order statistical tests.

Features include:
* Compression of embedded data
* Encryption of embedded data
* Embedding of a checksum to verify the integrity of the extraced data
* Support for JPEG, BMP, WAV and AU files

How to install steghide in Ubuntu / Debian
Open a terminal
$apt-get install steghide (or Use Synaptic Package Manager)

Basic Usage
$ steghide embed -cf picture.jpg -ef love.txt
Enter passphrase:

Re-Enter passphrase:

embedding "love.txt" in "picture.jpg"... done

This command will embed the file love.txt in the cover file picture.jpg

After you have embedded your love letter love.txt data as shown above and you can send the file picture.jpg to your lover.

Now How to extract file

$ teghide extract -sf picture.jpg
Enter passphrase:
the file "love.txt" does already exist. overwrite ? (y/n) y
wrote extracted data to "love.txt".

This will give file information

steghide info picture.jpg
"picture.jpg":
format: jpeg
capacity: 1.2 KB
Try to get information about embedded data ? (y/n) y
Enter passphrase:
embedded file "love.txt":
    size: 34.0 Byte
    encrypted: rijndael-128, cbc
    compressed: yes