I can't find out how to break 1 round of feistel network (obtaining the key).
I understand why this equation takes place:
$R_1 \oplus L_0 = f(R_0, k_1)$
But how can i find the key ($k_1$) from it?
I saw it's possible in a few references:
http://www.cs.technion.ac.il/~cs236506/04/slides/crypto-slides-05-bc-tutor.4x2.pdf http://people.scs.carleton.ca/~maheshwa/courses/4109/Seminar11/atttack%20on%20DES.pdf https://www.icg.isy.liu.se/courses/tsit03/forelasningar/cryptolecture04.pdf KPA on Feistel cipher?