mistery_picture.py #CTF

mistery_picture.py

import cv2
import re

img_ = cv2.imread('./mistery_picture.bmp')
mi_ = ''.join([str(x) for x in (img_ % 2).reshape(-1)])
for off_ in range(8):
    mi_1 = mi_[off_:]
    xxx = (''.join([chr(int(mi_1[8*i:8*(i+1)][::-1], 2)) for i in range(len(mi_1) // 8)]))
    print(re.findall('(Iron[\s\S]{,66})', xxx))

mistery_picture1.py

# 修改了下代码


import cv2
import re

img_ = cv2.imread('./mistery_picture.bmp')
img_1 = (img_ % 2).reshape(-1) # 模2是提取最后一个bit reshpe(-1) 就是从左到右，从上到下去拼接像素
mi_ = ''
for x in img_1:
    mi_ = mi_ + ''.join(str(x))

# mi_ = ''.join([str(x) for x in (img_ % 2).reshape(-1)])
for off_ in range(8):
    mi_1 = mi_[off_:]
    xxx = ''
    for i in range(len(mi_1)//8):
        a = chr(int(mi_1[8*i:8*(i+1)][::-1],2)) # [::-1] 逆序组合
        xxx = xxx + a
    # xxx = (''.join([chr(int(mi_1[8*i:8*(i+1)][::-1], 2)) for i in range(len(mi_1) // 8)]))
    print(re.findall('(Iron[\s\S]{,66})', xxx))