CTF杂项之图片隐写、crypto
图片隐写：
1、将图片里的数据转换成二维码：
用linux下的信息提取工具Binwalk看一下：
root@kali:~/Desktop# binwalk 图片名
DECIMAL HEXADECIMAL DESCRIPTION
--------------------------------------------------------------------------------
0 0x0 PNG image, 1000 x 562, 8-bit/color RGBA, non-interlaced
91 0x5B Zlib compressed data, compressed
3526 0xDC6 Zlib compressed data, best compression
1421307 0x15AFFB Zlib compressed data, default
compression后面是Zlib压缩的数据，写个脚本解压一下：
python提取脚本
from PIL import Image
from zlib import *
data = open(‘图片名‘,‘rb‘).read()[0x15AFFB:]
data = decompress(data)
img = Image.new(‘1‘, (25,25))
d = img.load()
for n,i in enumerate(data):
d[(n%25,n/25)] = int(i)*255
f = open(‘flag.png‘,‘wb‘)
img.save(f)
文章来自：http://www.cnblogs.com/tyomcat/p/5422068.html