Lost Modulus — HackTheBox Crypto Challenge(RSA) Simple Writeup | 2023

Lost Modulus — HackTheBox Crypto Challenge(RSA) Simple Writeup | 2023

HackTheBox’s Lost Modulus RSA Crypto Challenge simple writeup | Karthikeyan Nagaraj

Description:

I encrypted a secret message with RSA but I lost the modulus. Can you help me recover it?

Task Files:

You can Download the task Files Here

1. challenge.py

#!/usr/bin/python3
from Crypto.Util.number import getPrime, long_to_bytes, inverse
flag = open('flag.txt', 'r').read().strip().encode()

class RSA:
    def __init__(self):
        self.p = getPrime(512)
        self.q = getPrime(512)
        self.e = 3
        self.n = self.p * self.q …

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