Participated the LINE CTF 2022. The 0007 article. I did some rev challenges when the CTF started, it was too hard for me. So, I decided to see the difficulty of each problem. After 20 hours from the beginning, I took some easy problems, an…

This is a writeup for OFPPT-CTF 2022. The 0006 article. This was for beginner, but I couldn't solve all of them. I found something new knowledge in rev and web challenges. Unicode A file with the header shown in the image below was given. …