This challenge was created by our sponsor, ZeroDays!
I long for the good old days, when children obeyed their parents, ignorance was bliss and the DVD's were still encrypted.
We've taken some inspiration from the DVD CSS encryption scheme for this challenge. Can you crack our custom scheme and recover the flag?
Hint: these slides may help: http://www.ccs.neu.edu/home/alina/classes/Spring2018/Lecture5.pdf