Here is yet another Tux image in bmp format encrypted using a block cipher in ECB mode. Once again, it shows us that it is not secure. The top left picture is the original, while the 3 other images are generated by encrypting image data using PRESENT-80 block cipher with 3 different keys.
This small exercise was suggested by Nikita Veshchikov during the exercise sessions of the course “Introduction to Cryptography” given by Professor Olivier Markowitch.
The C++ code by Jérôme Hellinckx is available and you can try it for yourself.