• alias: Xornet
    • pronounces just same as "hornet"


  • Cyber Security
    • Reverse Engineering
    • Binary Exploitation
    • Malware Analysis
    • Game Hacking


  • Playing Category: Rev, Pwn and Misc
  • Team: ./Vespiary


Almost writeups are written in Japanese. If you are not familiar with Japanese and want to read them in English, please contact me via Twitter (@Xornet_). And any question about my solutions is welcome.

ångstromCTF 201933/1374my first CTFlink
InterKosenCTF 20194/91link
TokyoWesterns CTF 5th 201959/1005link
SECCON CTF 2019 Quals37/799国内決勝(Domestic)出場(12/15)
redpwnCTF 202016/1519
ASIS CTF 202031/815
TSG CTF 20207/627
InterKosenCTF 20203/133Perfectlink
TokyoWesterns CTF 6th 202032/648link
SECCON 2020 Online CTF7/579link
KipodAfterFree CTF 202012/624
pbctf 202010/457link
Harekaze mini CTF 20205/141Perfectlink
zer0pts CTF 202115/951link
LINE CTF8/680link
DEF CON CTF Qualifier 202134/433
Circle City Con 20212/291link
Crypto CTF 202115/444
BSides Noida CTF 20214/411
CakeCTF 20212/157link
DownUnderCTF 20212/1594link
TSG CTF 20213/775link
ASIS CTF 202114/741link
BSides Ahmedabad CTF 20211/314link
N1CTF 20217/601link (English)
CrewCTF 20225/758link
ångstromCTF 20227/11801 2
Google CTF 202227/3821 2
LINE CTF 202310/477Japanese, English
zer0pts CTF 20238/476link


  • Github: I'm not a developer. I sometimes write CTF solutions.
  • HackMD: Archived CTF solutions and some articles about cryptography and mathematics.