steganography tutorial

Welcome.

Steghide is a steganography tool. The main purpose of this tool is to hide confidential data in an image or audio file. In this tutorial, I will explain the tools and usage in a beginner-friendly way.

Topics discussed :
**1. Image Steganography

More options 2.1 Information retrieve
2.2 Compression mode
2.3 Encryption Algorithms
Audio Steganography**

Below showing, my cover file — index.jpeg and my.txt is the secret data file

Text file to hide inside image / audio

Image and secret text file

Image Steganography

Basic of image steganography :

Steghide supports JPEG, BMP, WAV and AU file formats. File formats like PNG are not supported with this tool. But BMP, GIF and JPG are also supported.
Embed mode is used to hide data inside file
-ef \= The file I want to hide inside another file
-cf = Cover file, the image file I will use to hide inside
A password is required to embed the file. This will add extra security to the file we want to protect.

Hiding data inside an image

Picture after embedding

Extract mode is used to retrieve the secret file from the image
-sf = specify the file with secret message
You will need the password that was used while embedding file

Extract and read secret data

More options

Information retrieve :

Before extracting data from any image / audio file, we can check for the information
If the file is password protected, we will need that password to view the information about embedded file
Info module is used to do this.

Information retrieve

Compression mode :

Compression is used to save memory space, but a small mistake can corrupt the entire file
steghide has 9 level (1 to 9) for compression
lowest level (1) = fast compression
highest level (9) = best compression
-z is used to specify the level