The flag begins with CTFlearn{...
Study APP3 or just google the solution
Google 'jpeg file format APP application data'... to solve this problem you have to look at the internal structure of the jpeg file, and the flag is hidden in the APP3 data block
there are lots of hints in this thread
What an amazing challenge , it's hard and consume a lot of time but fun in the same time.
Glad you liked it.
APP3
google 'jpeg file format APP3'
can you dm me on discord? #kcbowhunter
2 months ago
I sent request for you on Discord Kcbowhunter, I have some questions a bout this case. hope you response soon