Rating:

To solve this challenge we used Chinese remainder algorithm

1) p and q are the primes
2) dp = d mod (p - 1)
3) dq = d mod (q - 1)
4) Qinv = 1/q mod p *This is not integer devision but multiplicative inverse
5) m1 = pow(c, dp, p)
6) m2 = pow(c, dq, q) 7-1) h = Qinv(m1 - m2) mod p ; if m1 < m2 7-2) h = Qinv * (m1 + q/p)
7) m = m2 + hq

flag{Theres_more_than_one_way_to_RSA}

Original writeup (https://github.com/zionspike/ctf-writeup/blob/master/Crypto/%5BpicoCTF%202017%5D%20-%20Weird%20RSA%20-%2090/kapi-note.md).