Slightly broken RSA implementation makes breaking easier. Full writeup:

[https://ctf.rip/write-ups/crypto/rsa/reversing/rarctf-2021/#sRSA](https://ctf.rip/write-ups/crypto/rsa/reversing/rarctf-2021/#sRSA)

Original writeup (https://ctf.rip/write-ups/crypto/rsa/reversing/rarctf-2021/#sRSA).