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The Code Golf is essentially to create an unkeyed 1:1 function to transform images. As such, it's highly vulnerable to chosen-plaintext attacks: if an attacker can convince Alice or Bob to transmit a carefully-crafted image, they can build up a map of what pixels get moved to where for that image size. Further, if the images being transmitted have ...


Basically this is a transposition cipher. What you would do is looking for pattern and rearrange like with this text example: http://www.richkni.co.uk/php/crypta/trans0.php Your example with grey scale text would be easier as the picture on code golf because you could see very easy what is a correct solution.

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