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Newark Academy CTF (NACTF) 2021 — Challenge Writeups
This post contains writeups for some challenges in this CTF.
1. Juliet’s Note
It is the first cryptography challenge in the CTF. They have given the message which we have to decode to find the flag.
It is a simple integer to character to match. I coded a small python code to find the flag. I avoided the brackets and added them later.
2. Secret Ingredient
This is the first challenge in Forensics category. They gave us a file which is text file with the extension of “.txt”.
I used file to check the headers.
It seems like it is not a text file but it is image file with ‘.jpeg’ extension. So copied the file to jpeg format.
Later I opened the image file and I got the flag.
3. PowerAmulet
This is a Forensics challenge. They gave a jpg image file. When we open it we can see a picture of ocean. I tried exiftool with this image and found nothing.
Then I tried binwalk to find whether any file is zipped with this image and it was a success. So I extracted the files.
binwalk -e ocean.jpg
