CTFtime.org / CSAW CTF Qualification Round 2021 / Gatekeeping / Writeup

Rating: 3.5

[Original writeup](https://github.com/DauHoangTai/CTF/blob/master/2021/CsawCTF/README.md#challenge-gatekeeping) https://github.com/DauHoangTai/CTF/blob/master/2021/CsawCTF/README.md#challenge-gatekeeping