DEF CON CTF 23' Quals | Welcome to Quals | Writeup

So for this challenge, we were given an instance which asked for our special ticket for every team.

Now it asks for a command.

After working out with it with lots of fuzzing I found out that it was a bash shell and each letter was mapped like this

qwertyuiopasdfghjklzxcvbnm

djreglhvbcnfqstuwxymkpioaz

So now to ls you simply wrote yf /

So to print the flag instead of cat welcome_flag.txt we wrote png /jrypbzr_synt.gkg which gave us the flag.

This was it for our first challenge.