Introduction

Finding Flags

just submit the flag in desc

Flag: crypto{y0ur_f1rst_fl4g}

Great Snakes

run the script, get flag

#!/usr/bin/env python3

import sys
# import this

if sys.version_info.major == 2:
    print("You are running Python 2, which is no longer supported. Please update to Python 3.")

ords = [81, 64, 75, 66, 70, 93, 73, 72, 1, 92, 109, 2, 84, 109, 66, 75, 70, 90, 2, 92, 79]

print("Here is your flag:")
print("".join(chr(o ^ 0x32) for o in ords))

Flag: crypto{z3n_0f_pyth0n}

Network Attacks

sending data with json using pwntools, change "clothes" to "flag"

#!/usr/bin/env python3

from pwn import * # pip install pwntools
import json

HOST = "socket.cryptohack.org"
PORT = 11112

r = remote(HOST, PORT)

def json_recv():
    line = r.readline()
    return json.loads(line.decode())

def json_send(hsh):
    request = json.dumps(hsh).encode()
    r.sendline(request)

print(r.readline())
print(r.readline())
print(r.readline())
print(r.readline())

request = {
    "buy": "flag"
}
json_send(request)

response = json_recv()

print(response)

Flag: crypto{sh0pp1ng_f0r_fl4g5}