# zer0pts CTF 2021 Writeups

The tasks and solvers are available [**here!**](https://github.com/zer0pts/zer0pts-ctf-2021)

| Challenge | Author | Estimated Difficulty | Solves | Link to Writeup |
|:--------------------:|:-------------:|:--------------------:|:------:|:-------------------------------------------:|
| Not Beginner's Stack | ptr-yudai | warmup | 161 | https://hackmd.io/@ptr-yudai/HJJ_HUeQd |
| stopwatch | ptr-yudai | easy | 22 | https://hackmd.io/@ptr-yudai/rJDR0DxmO |
| OneShot | ptr-yudai | easy-medium | 23 | https://hackmd.io/@ptr-yudai/rJgvRwWXO |
| safe vector | ptr-yudai | medium | 34 | https://hackmd.io/@ptr-yudai/BJ1Zs2lXO |
| gorypt | ptr-yudai | medium-hard | 4 | https://hackmd.io/@ptr-yudai/r12IJpg7d |
| nasm kit | ptr-yudai | hard | 15 | https://hackmd.io/@ptr-yudai/rkIng0ZQ_ |
| GuestFS:RCE | ptr-yudai | lunatic | 4 | https://hackmd.io/@ptr-yudai/B1T8EIXIP |
| GuestFS:AFR | ptr-yudai | warmup | 15 | https://hackmd.io/@st98/SJPlajJ7O |
| Baby SQLi | ptr-yudai | easy | 30 | https://hackmd.io/@st98/S1cf6iyQd |
| Kantan Calc | st98 | easy-medium | 50 | https://hackmd.io/@st98/Sy7D5NymO |
| Simple Blog | st98 | medium-hard | 23 | https://hackmd.io/@st98/S1z9qV1X_ |
| Pdf Generator | s1r1us | medium-hard | 18 | https://blog.s1r1us.ninja/CTF/zer0ptsctf2021-challenges |
| NOT Pdf Generator | s1r1us | medium-hard | 4 | https://blog.s1r1us.ninja/CTF/zer0ptsctf2021-challenges |
| infected | ptr-yudai | warmup | 108 | https://hackmd.io/@theoldmoon0602/HyE5BgfmO |
| syscall 777 | ptr-yudai | easy | 61 | :construction: |
| SuperSecretLogin | x0r19x91 | medium-hard | 14 | https://hackmd.io/@x0r19x91/H1TdWKRMu |
| Not Beginner's Rev | ptr-yudai | medium-hard | 14 | :construction: |
| spotlight | ptr-yudai | hard | 14 | :construction: |
| war(sa)mup | theoremoon | warmup | 95 | https://hackmd.io/@theoldmoon0602/SkIoOe0Gd |
| OT or NOT OT | theoremoon | easy | 69 | https://hackmd.io/@theoldmoon0602/BJ3qRgRz_ |
| easy pseudo random | mitsu | easy | 31 | https://hackmd.io/@mitsu/rylnTLkXu |
| janken-vs-yoshiking | theoremoon | medium | 44 | https://hackmd.io/@theoldmoon0602/r1cMHWCzd |
| NOT Mordell Primes | theoremoon | medium-hard | 19 | https://hackmd.io/@theoldmoon0602/Hyaa2-RG_ |
| 3-AES | theoremoon | hard | 27 | https://hackmd.io/@theoldmoon0602/SJ3X1f0zu |
| signme | ptr-yudai | hard | 12 | https://hackmd.io/@ptr-yudai/rk6U4dPqv |
| pure division | mitsu | lunatic | 7 | https://hackmd.io/@mitsu/ByhK-tZX_ |
| Subleq64 | (=\^・u・\^=) | medium | 5 | :construction: |
| Tokyo Network | ptr-yudai | hard | 6 | https://hackmd.io/@ptr-yudai/Hyy2ytX-u |