Affine cipher,

Conduct known plaintext attack for keys and solve with affine cipher. Full writeup: [https://ctf.rip/write-ups/crypto/htb-cybersanta/#xmasspirit](https://ctf.rip/write-ups/crypto/htb-cybersanta/#xmasspirit)

Original writeup (https://ctf.rip/write-ups/crypto/htb-cybersanta/#xmasspirit).