# InsomnihackTeaser2017-cryptoquizz
Insomnihack Teaser 2017 cryptoquizz Write Up

Cryptoquizz :

Hello, young hacker. Are you ready to fight rogue machines ? Now, you'll have to prove us that you are a genuine cryptographer.

Running on quizz.teaser.insomnihack.ch:1031

Solution :

When we connect to host this is the sample output :
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
madHatter:Desktop madHatter$ nc quizz.teaser.insomnihack.ch 1031

~~ Hello, young hacker. Are you ready to fight rogue machines ? ~~
~~ Now, you'll have to prove us that you are a genuine ~~
~~ cryptographer. ~~

~~ What is the birth year of Ralph Merkle ?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

It askes us questions about birth year of different cryptographers.

In order to get the flag we wrote a python code which has all of the cryptograpers name and birth year.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
import socket

def netcat(host, port):
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((host, int(port)))
content = None
while True:
data = s.recv(4096)
print(repr(data))

if "Shannon" in repr(data):
content = "1916\n"
s.sendall(content.encode())

if "Davies" in repr(data):
content = "1924\n"
s.sendall(content.encode())

if "Ferguson" in repr(data):
content = "1965\n"
s.sendall(content.encode())

if "Vaudenay" in repr(data):
content = "1968\n"
s.sendall(content.encode())

if "Mitsuru Matsui" in repr(data):
content = "1956\n"
s.sendall(content.encode())

if "Stinson" in repr(data):
content = "1956\n"
s.sendall(content.encode())

if "Brassard" in repr(data):
content = "1955\n"
s.sendall(content.encode())

if "Ross Anderson" in repr(data):
content = "1956\n"
s.sendall(content.encode())

if "Feistel" in repr(data):
content = "1915\n"
s.sendall(content.encode())

if "Bernstein" in repr(data):
content = "1971\n"
s.sendall(content.encode())

if "Kocher" in repr(data):
content = "1973\n"
s.sendall(content.encode())

if "Coppersmith" in repr(data):
content = "1950\n"
s.sendall(content.encode())

if "Lindell" in repr(data):
content = "1971\n"
s.sendall(content.encode())

if "Rijmen" in repr(data):
content = "1970\n"
s.sendall(content.encode())

if "Shamir" in repr(data):
content = "1952\n"
s.sendall(content.encode())

if "Bellare" in repr(data):
content = "1962\n"
s.sendall(content.encode())

if "Michael O. Rabin" in repr(data):
content = "1949\n"
s.sendall(content.encode())

if "Bleichenbacher" in repr(data):
content = "1964\n"
s.sendall(content.encode())

if "Chaum" in repr(data):
content = "1955\n"
s.sendall(content.encode())

if "Oorschot" in repr(data):
content = "1962\n"
s.sendall(content.encode())

if "Sahai" in repr(data):
content = "1974\n"
s.sendall(content.encode())

if "Ferguson" in repr(data):
content = "1965\n"
s.sendall(content.encode())

if "Niels" in repr(data):
content = "1964\n"
s.sendall(content.encode())

if "Daemen" in repr(data):
content = "1965\n"
s.sendall(content.encode())

if "Xiaoyun" in repr(data):
content = "1966\n"
s.sendall(content.encode())

if "Micali" in repr(data):
content = "1954\n"
s.sendall(content.encode())

if "Victor S. Miller" in repr(data):
content = "1947\n"
s.sendall(content.encode())

if "Patarin" in repr(data):
content = "1965\n"
s.sendall(content.encode())

if "Merkle" in repr(data):
content = "1952\n"
s.sendall(content.encode())

if "Donald Davies" in repr(data):
content = "1924\n"
s.sendall(content.encode())

if "Rogaway" in repr(data):
content = "1962\n"
s.sendall(content.encode())

if "Yvo Desmedt" in repr(data):
content = "1956\n"
s.sendall(content.encode())

if "Smart" in repr(data):
content = "1967\n"
s.sendall(content.encode())

if "Hellman" in repr(data):
content = "1945\n"
s.sendall(content.encode())

if "Okamoto" in repr(data):
content = "1952\n"
s.sendall(content.encode())

if "Knudsen" in repr(data):
content = "1962\n"
s.sendall(content.encode())

if "Schnorr" in repr(data):
content = "1943\n"
s.sendall(content.encode())

if "Massey" in repr(data):
content = "1934\n"
s.sendall(content.encode())

if "Biryukov" in repr(data):
content = "1969\n"
s.sendall(content.encode())

if "Biham" in repr(data):
content = "1960\n"
s.sendall(content.encode())

if "Stern" in repr(data):
content = "1949\n"
s.sendall(content.encode())

if "Joux" in repr(data):
content = "1967\n"
s.sendall(content.encode())

if "Halevi" in repr(data):
content = "1966\n"
s.sendall(content.encode())

if "Cramer" in repr(data):
content = "1968\n"
s.sendall(content.encode())

if "David Naccache" in repr(data):
content = "1967\n"
s.sendall(content.encode())

if "Kaisa Nyberg" in repr(data):
content = "1967\n"
s.sendall(content.encode())

if "Whitfield" in repr(data):
content = "1944\n"
s.sendall(content.encode())

if "Moni Naor" in repr(data):
content = "1961\n"
s.sendall(content.encode())

if "Rafail Ostrovsky" in repr(data):
content = "1963\n"
s.sendall(content.encode())

if not data:
print(repr(data))
break

s.shutdown(socket.SHUT_WR)
s.close()

netcat("quizz.teaser.insomnihack.ch",1031)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

After responding questions it gives us the flag in this output :

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
OK, young hacker. You are now considered to be a INS{GENUINE_CRYPTOGRAPHER_BUT_NOT_YET_A_PROVEN_SKILLED_ONE}
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Original writeup (https://github.com/tahaSuleyman/InsomnihackTeaser2017-cryptoquizz.git).