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@Coxxs /oneTimePad.py Secret
Created Mar 22, 2017

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#!/usr/bin/env python
# coding=utf-8
from os import urandom
def process(m, k):
tmp = m ^ k
res = 0
for i in bin(tmp)[2:]:
res = res << 1;
if (int(i)):
res = res ^ tmp
if (res >> 256):
res = res ^ P
return res
def keygen(seed):
key = str2num(urandom(32))
while True:
yield key
key = process(key, seed)
def str2num(s):
return int(s.encode('hex'), 16)
P = 0x10000000000000000000000000000000000000000000000000000000000000425L
true_secret = open('flag.txt').read()[:32]
assert len(true_secret) == 32
print 'flag{%s}' % true_secret
fake_secret1 = "I_am_not_a_secret_so_you_know_me"
fake_secret2 = "feeddeadbeefcafefeeddeadbeefcafe"
secret = str2num(urandom(32))
generator = keygen(secret)
ctxt1 = hex(str2num(true_secret) ^ generator.next())[2:-1]
ctxt2 = hex(str2num(fake_secret1) ^ generator.next())[2:-1]
ctxt3 = hex(str2num(fake_secret2) ^ generator.next())[2:-1]
f = open('ciphertext', 'w')
f.write(ctxt1+'\n')
f.write(ctxt2+'\n')
f.write(ctxt3+'\n')
f.close()
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