This weekend, I participated the Access Denied CTF 2022. I solved a couple of reversing challenges and had really fun. babyc A file written in C was given. I didn't get what the FLAG was, but I could predict it. Therefore, I wrote a python…

This weekend, I participated the SECCON Beginners CTF. I took some reversing problems and solved a couple of them. Quiz An ELF file was given when decompressed a given file. In many rev challenge for beginner, the flags can be obtained by …

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. …

This is a writeup for UTCTF 2022. The 0005 article. Jump around We got an executable file called "jump". First step, open it in ghidra. You can see the main function, but no function to show the flag is here. So, in this challenge, you nee…

I participated the DaVinci CTF 2022. The 0004 article. I solved one non-beginner problem, but I thought a problem which I can solve was for beginner. Mine Game The problem is to send the correct input to the server using the nc command. Op…

I participated Enginner CTF 2022. The 0003 article. I can do this all day. We can get "icandothisallday.zip" first and unzip it. icandothisallday.zip You can see lots of files in your current directory. Like this. We can guess that the fla…

wtfCTF2022に参加しました。第0002回です。適当にwriteup書きます。 前回のwriteupと言っても昨日まで開催されたcodegateCTFでは、大会終了後もチャレンジを閲覧できたために、どの大会でも同様に落とさないものだと勝手に解釈していた。そのため今回は、記…

CTF始めました。第0001回。writeup 適当に書きます。 CAFE zipファイルが与えられる。解凍した後、bot.pyを開くと20〜21行目にIDとPWを発見。 ページ移動先のFLAGをクリック。FLAGをゲット。 superbee zipファイルが与えられる。Go Home を連打したものの、…