Steganography.py is an entry-level steganography project by Ethan Genser. It encodes the color values for each pixel on the secret image in the last bit of the color values in the coresponding pixels on the cover image.
Before you can run this program, ensure that you have the following software installed and functional:
- Python 3.5.2 or better
- PIL version 5.0.0 or better
With default implementation:
Before starting this program, simply ensure that the files Implementation.py and Steganography.py are in the same folder. Then, open Implementation.py in a compatible Python terminal. The program will ask you whether you would like to encrypt or decrypt an image. If you have never used the program before, start off by typing 'encrypt' and pressing enter/return. The program when proceed to ask for the location of two images. The first image will be the cover image. The second image is the secret image that is hidden inside the cover image. The two images do not have to be the same size, however, the program will normalize the dimensions of both the cover image and hidden image before encoding. This means the resulting encoded image will have the width of the thinnest image and the height of the shortest image. After the program finishes execution, it will save the encrypted image with the name Encrypted_Image.png. You can now use the program to retrieve the hidden image back from the encryted image. To do this, start Implementation.py and type 'decrypt' and press enter/return. The program will ask for the location of the image. Once you have entered the encrypted image's location, the program will begin the decryption process. When complete, the recovered image will be saved with the name 'Decrypted_Image.png'.
With custom implementation:
To use the Steganography module in your own custom program, add the following line to the top of your program:
import Steganography as sg
After this, the module's two basic functions encrypt and decrypt will become available for use. The encrypt function takes two images as arguments and return a single, encrypted image. The decrypt function takes a single, encrypted image and, as the name implies, returns the decrypted image hidden inside.
Steganography.py is based on PIL v5.0.0. As such, the program is only capable of loading images with PIL compatible file extensions. In addition, some image formats that are supported by the PIL library may not be supported by Steganography.py. Listed bellow are the currently supported file extension supported by Steganography.py (Attempt to load any file not included in the list bellow, may cause the program to not function properly or crash). A full list of the PIL library's compatible image formats can be found here.
- PNG
- BMP
Bellow is the a list of each program file and a brief explanation of its role:
- Implementation.py: This is an example of how Steganography.py can be implemented in a project.
- Steganography.py: This is the main module. Contains the
encryptanddecryptfunctions.
- Ethan Genser - Creator
This project is licensed under the Apache License Version 2.0 - see the LICENSE file for details.