MeePwn CTF 2017: Simpler RSA (100)

Tue 18 July 2017 · 2 min read
We are given two files: one is simple.py, which used to do an encryption, and pubkey.txt, which is the generated public key when encrypting with simple.py. Here's the content of simpe.py.
```
from Crypto.Util.number import *
import random
# from flag import FLAG

def generate(nbits):
    p …
```
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MeePwn CTF 2017: |\/|/-\T|-| (100)

Tue 18 July 2017 · 2 min read

We are given a file, hack.py, which looks as follows.

from Crypto.Util.number import *
from hashlib import md5

flag = "XXX"
assert len(flag) == 4
pad = bytes_to_long(md5(flag).digest())

hack = 0

for char in flag:
    hack+= pad
    hack*= ord(char)

print hack
print pad
print hack % pad
#hack …

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