This challenge series introduces in detail the handling of the differential cryptanalysis (DCA). In the first two challenges you have to decrypt encrypted images and enter the code shown in the images. The first challenge needs no filtering, as only valid plaintext-ciphertext pairs are delivered.
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Hello,

I am one of the authors of this challenge. We tried to create a challenge which explains how differential cryptanalysis works in practice (clearly, using toy ciphers).

We would like to ask some questions to our solvers:

1) How would you rate the difficulty of this challenge? Did it fit to level 2?

2) Did you use our tutorial and information to learn about differential cryptanalysis or did you already have pre-knowledge about that?

3) Which tools did you use for solving the challenge?

4) Do you have any suggestions how we can improve future challenges about (differential) cryptanalysis?

Kind regards,
Nils :-)