We often send secrets messages using some type of cryptographic methods .
We can also send a secret message inside a file using stegonography. Here we are using tool called steghide.
In steghide, We are embedding a secret message inside a jpeg file. We often send images to our friends, so most of them thinks that is only an image file.
Let’s install the tool ( In Debian distributions)
$sudo apt install steghide
Embedding Secret message inside a Image
- Let’s Assume you have image file called image.jpeg
- Create a secret text inside a secret.txt file
- Using below command, we can create our steg file called image.jpeg(where secret.txt hidden inside this file)
$steghide embed -cf image.jpeg -ef secret.txt
- After executing the command, it’s ask to set passphrase. If anyone found out some file embed in image file, he have to provide a password to see a secret text inside secret.txt
Extract the message from the steg file
- By using below commad we can extract the secret message inside an image file.
$steghide extract -sf image.jpeg
- If user set passphrase, you have to enter the passphrase to extract the secret message.
If you have received a file that contains embedded data and you want to get some information about it before extracting it.We can use info command shown below.
$steghide info image.jpeg
You can also embedded a secret text with other file formats such as audio,video etc.
