CTFtime.org / Cyber Apocalypse 2021 / Off the grid / Writeup

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[Original writeup](https://nisaruj.medium.com/htb-cyber-apocalypse-2021-off-the-grid-baddb484e342) (https://nisaruj.medium.com/htb-cyber-apocalypse-2021-off-the-grid-baddb484e342)