https://brain.fuw.edu.pl/edu/index.php/TI/Zadania_powtorzeniowe2

http://www.cs.haifa.ac.il/~orrd/HashFuncSeminar/Lecture3.pdf

http://marc-stevens.nl/research/md5-1block-collision/

http://www.mscs.dal.ca/~selinger/md5collision/

http://www.staff.amu.edu.pl/~renmich/ZBIF/