crypto1_solve_matess3r4

crypto1_solve_matess3r4.py

from telnetlib import *
import json
from libnum import *


r = Telnet('125.235.240.166', 13338)


def get_pub():
	r.read_until("Your choice: ")
	r.write("4\n")
	r.read_until("Pubkey: ")
	pub = json.loads(r.read_until("\n").strip())
	return int(pub["N"]),int(pub["e"])

def enc(data):
	r.read_until("Your choice: ")
	r.write("1\n")
	r.read_until("Your message: ")
	r.write(data + "\n")
	r.read_until("Your cipher: ")
	cipher = r.read_until("\n").strip()
	r.read_until("Your cipher_flag: ")
	flag_enc = r.read_until("\n").strip()
	return int(cipher),int(flag_enc)

def dec(enc_data):
	r.read_until("Your choice: ")
	r.write("2\n")
	r.read_until("Your cipher: ")
	r.write(enc_data + "\n")
	r.read_until("Decrypted message: ")
	dec_mess = r.read_until("\n").strip()
	return int(dec_mess)

c,c_flag = enc("ducbanhmihehekakapepejjjjj")

n,e = get_pub()


m = s2n("ducbanhmihehekakapepejjjjj")
k = pow(m,e*m,n)

enc_flag =int(c_flag * invmod(k,n) % n)

print n2s(dec(str(enc_flag)))