Hint: For libc hunters, it's probably Debian Jessie
Info: No more new challenges coming, so pwn them now and be done till next year! :)
Hint: New hint for ndis!

crypto / shaman

Oh great shaman!

Somehow the village idiot got his hands on this fancy control machine controlling things. Obviously, we also want to control things (who wouldn’t?), so we reverse-engineered the code. Unfortunately, the machine is cryptographically protected against misuse.

Could you please maybe spend a few seconds of your inestimably valuable time to break that utterly simple cryptosystem and enlighten us foolish mortals with your infinite wisdom?

nc 31031

NOTE: Since I am really bad at math, the share received from the server won’t be accepted when sent back. Don’t get confused by this — the challenge is solvable nevertheless.

500 Basepoints + 50 Bonuspoints * min(1, 3/1 Solves) = 550 Points

Solved by:

Team Time
LC↯BC 2016-10-01 11:26:07 +0000 UTC