ZeroDays CTF 2018 – “edgescan” Challenge
The "edgescan" challenge under the "Reverse Engineering" category of the ZeroDays Capture the Flag 2018 event was pretty straightforward although I wasn't able to solve it during the actual event due to time pressure. So to start with, the challenge description went as follows:
So edgescan kindly sent us a small challenge, we've tweaked it slightly.
Enter the key to get your flag.
Enjoy!
Clues:
The flag is in the usual format.
The flag message is XORed with the key (12 chars).
The first clue says "The flag is in the usual format" which means, it should be in the format of ZD2018{???????????????????} as per example flags given in the event. The second clue on the other hand says that the flag message is XORed with a 12-character key. During the event, I actually thought tha
