- use [https://github.com/Ganapati/RsaCtfTool](https://github.com/Ganapati/RsaCtfTool)

after installing the tool run command:

`python3 ~/RsaCtfTool/RsaCtfTool.py --publickey ./key.pub --uncipherfile mystery.txt`

in challenge directory and it'll spit the flag

### flag

`kqctf{y0uv3_6r4du473d_fr0m_r54_m1ddl3_5ch00l_abe7e79e244a9686efc0}`

Original writeup (https://earthy-saguaro-61f.notion.site/Cloudsourcing-cb04a4df35774fda886af83c6a4ea9d6).