# zer0pts CTF 2021 Writeups The tasks and solvers are available [**here!**](https://gitlab.com/zer0pts/zer0ptsctf-2021-challenges) | 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 |