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One Time Pad: Key Reuse

Demonstrated by Sierra on Jan 26.

This demo demonstrates the pitfalls of key re-use with one time pads. The demonstration program was

The program consumes an image representing a one time pad key, then encrypts two different images with the same key. Finally, it XORs the two encrypted images together, which causes a certain amount of information leakage.

You can invoke the script like this:

python <image1-path> <image2-path>

Note: The program relies on the cv2 and numpy Python packages. If you have the pip installer for Python, you can install these as follows (you may need to install these using sudo if you don’t have root permissions):

pip install opencv-python
pip install numpy