• alias(es): Xornet (, Hornet, Tenxor)
  • gender: male
  • email: einnotwendigesubel[@]
    • Please replace "[@]" to "@"
    • In the future, the address will be changed


  • Tokyo Institute of Technology (Physics) (2015/4~)
  • Japan Advanced Institute of Science and Technology (Information Science) (2021/4~)


  • Cyber Security
    • Cryptography
    • Binary Exploitation
    • Malware Analysis
  • Number Theory
  • Quantum Algorithm


  • Like: Modern Crypto, Pwn
  • Team: ./Vespiary (Founder)


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
  • Twitter: Almost Japanese and junk Tweets.
  • old blog: (stop update) Some articles(for example, writeups) will be moved to this blog.
  • Github: I'm not a developer. I sometimes write CTF solutions.
  • HackMD: Archived CTF solutions and some articles about cryptography and mathematics.
  • Steam
  • Discord (Xornet#3895): If you don't send spams, be my friend!!