CastorsCTF | Password Crack 3

Description#

7adebe1e15c37e23ab25c40a317b76547a75ad84bf57b378520fd59b66dd9e12

Cracking#

• Trying to solve this with hashcat does not work because this time the word is already wrapped with castorsCTF{...} already and probably the word which is wrapped is from the same wordlist (rockyou.txt)
• Writing a script using hashlib in python seems like the way to go here because we’ll be able to use hashlib to encrypt word from the rockyou.txt already wrapped with castorsCTF{...}.

Getting the flag#

Script

import hashlib
f = open('rockyou.txt', 'r', encoding='utf-8', errors='ignore') # Open file on read mode
lines = f.read().splitlines()
for i in lines:
    i = "castorsCTF{"+i+"}"
    i = i.encode('utf-8')
    encrypted = hashlib.sha256(i).hexdigest()
    if(encrypted=="7adebe1e15c37e23ab25c40a317b76547a75ad84bf57b378520fd59b66dd9e12"):
        print(i.decode('utf-8'))
        break

• Running the script will give the flag as using this because here we’ve wrapped all the words in rockyou.txt with the flag format already.

flag: castorsCTF{theformat!}