Steganography

Steghide

steghide is one of the popular steganography tools that is able to hide a message inside an image. The advantage of using it is that it can encrypt data with a passphrase and the only way to unlock is having that password or otherwise you can't extract any data from it.

Install steghide by typing sudo apt install steghide.

-Download the given task files and extract it

-To extract a file, type steghide extract -sf <file.name>

-once extracted, then it will give you a text file

-check it

Exiftool is a tool that works with metadata in image. Metadata is data that describes other data.

Exiftool allows you to edit or view image metadata. You can simply install it by typing sudo apt install exiftool.

As you can see, when you simply type exiftool <image filename>, it shows you the data about the image file like document name, file type, and etc.

Spectrograms steganography is a method of hiding a message inside an audio file. It's worth to use it whenever you deal with audio stego. We are going to use Sonic Visualizer (go to https://www.sonicvisualiser.org/download.html) to analyze the spectrogram of the audio. For linux user, download it and go to properties and click 'allow this program to run'.

Open Sonic Visualizer -> Click file->open -> select file you want to analyze -> click Layer -> add a spectrogram