密码学?爆破就行了

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WriteUp来源

https://xz.aliyun.com/t/8581

题目考点

• 爆破

解题思路

这道签到题主要是想给大家推荐一个密码学常用的库,可以多线程的爆破

我用的默认线程解只需要不到7s(还可以更快的)

#!/usr/bin/python2
from pwn import pwnlib
from pwnlib.util.iters import mbruteforce
import hashlib 

flag      = 'd0g3{71b2b5616ee2a4639a07d979ebde964c}'
msgbroken = 'd0g3{71b2b5616**2a4639**7d979**de964c}'
table = '0123456789abcdef'
assert len(table) == 16

m1 = 'd0g3{71b2b5616'
m2 = '2a4639'
m3 = '7d979'
m4 = 'de964c}'

def f(res):
    ciphier = '0596d989a2938e16bcc5d6f89ce709ad9f64d36316ab80408cb6b89b3d7f064a'
    msgbroken = m1 + res[0:2] + m2 + res[2:4] + m3 + res[4:6] + m4
    tmp = hashlib.sha256(msgbroken).hexdigest()
    if tmp == ciphier:
        return True

res = mbruteforce(f,table,6,method='fixed')

print(m1 + res[0:2] + m2 + res[2:4] + m3 + res[4:6] + m4 )

Flag

d0g3{71b2b5616ee2a4639a07d979ebde964c}