HactivityCon2020 Writeups

Warmups

Hexgedit (points 30)

Woah! Someone opened the flag file in hexedit… and then gedit??

Download the image file below.

👉🏿 Clearly, it seems what it says in the problem description, doesn’t it?

Let’s find out.

Now, let’s find an easier way to have all the text in the image as a simple ascii/txt file. Wait a minute, Haven’t we heard of something called an OCR ? sure, we do. let’s fire up some online OCR service, upload the image and copy the text to a new file on our local machine. Also, check for any typo or error in the file.

Now we have a hexdump file with us. let’s reverse it to see the content of the file. shall we?

xxd -r -p hex_file.txt

fig(i) output

Clearly, among the output of the file is our flag !