CSAW CTF Quals 2013 - Reverse 500 - Impossible

Task:

Impossible - 500 Points

Solved by 82 teams.

WTF, his hp is over 9000! Beat the game to get your key.
impossible.nds

In this task we are provided with an image of the Nintendo DS cartridge with a game. The task clearly says we have to win probably cheating. Firstly I installed IDA loader for .nds files (You can find it in the net) but this haven't helped me a lot: there were a lot of ARM code and no clues how to get to the flag.

CSAW CTF Quals 2013 - Reverse 400 - keygenme

Task:

keygenme - 400 Points

Solved by 100 teams.

nc 128.238.66.219 14549
keygenme32.elf

We are given a x86 ELF executable. It takes 3 arguments(username, token1, token2) and prints whether they are good(*<:-)) or not. ( :-( ). In this task we need to write a keygen that will communicate with judges server, which sends username to keygen, and then send them valid token pair for each username.