RSA

To factor n, the following websites can be used.

FactorDB

Integer factorization calculator

To generate RSA keys and encrypt/decrypt data, RSA calculator can be used.

If p and q are known, either by factoring n or that they are given, the following Python script can decrypt the ciphertext.

#!/usr/bin/env python3

from Crypto.Util.number import inverse

c = 264927351071199256392067715088101727274736234498820
n = 324724323060034233289551751185171379596941511493891
e = 65537
p = 25001545096244227516337
q = 12988170203481337861511552243

phi = (p - 1) * (q - 1)
d = inverse(e, phi)

m = pow(c, d, n)

print(bytes.fromhex(hex(m)[2:]).decode('utf-8'))

RsaCtfTool can run a wide range of attacks on RSA ciphers.

More information on the attacks and installation instructions can be found on the GitHub page.

RsaCtfTool GitHub