Cryptography/haxXor
281 points
you either know it or not take this and get your flag
5552415c2b3525105a4657071b3e0b5f494b034515
Solution
I’ve wrote small python script to solve the challange (it was xor ;-)).
from pwnlib.util.fiddling import xor
flag = bytes.fromhex('5552415c2b3525105a4657071b3e0b5f494b034515')
flag_prefix = b'darkCTF{'
xorstr = xor(flag_prefix, flag[:len(flag_prefix)])
print(xor(flag, xorstr))
darkCTF{kud0s_h4xx0r}