69 lines
1.8 KiB
Python
69 lines
1.8 KiB
Python
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# -*- coding: utf-8 -*-
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"""
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Created on Sun May 19 12:43:26 2019
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@author: Administrator
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"""
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from PIL import Image
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def mod(x,y):
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return x%y
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def toasc(strr):
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return int(strr, 2)
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#le为所要提取的信息的长度，str1为加密载体图片的路径，str2为提取文件的保存路径
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def func(le,str1,str2):
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b=""
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im = Image.open(str1)
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lenth = le*8
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width,height = im.size[0],im.size[1]
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count = 0
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for h in range(height):
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for w in range(width):
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#获得(w,h)点像素的值
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pixel = im.getpixel((w, h))
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#此处余3，依次从R、G、B三个颜色通道获得最低位的隐藏信息
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if count%3==0:
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count+=1
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b=b+str((mod(int(pixel[0]),2)))
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if count ==lenth:
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break
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if count%3==1:
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count+=1
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b=b+str((mod(int(pixel[1]),2)))
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if count ==lenth:
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break
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if count%3==2:
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count+=1
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b=b+str((mod(int(pixel[2]),2)))
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if count ==lenth:
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break
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if count == lenth:
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break
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with open(str2,"w",encoding='utf-8') as f:
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for i in range(0,len(b),8):
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#以每8位为一组二进制，转换为十进制
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stra = toasc(b[i:i+8])
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#将转换后的十进制数视为ascii码，再转换为字符串写入到文件中
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#print((stra))
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f.write(chr(stra))
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print("完成信息提取！")
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def main():
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#文件长度
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le = 11
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#含有隐藏信息的图片
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new = "new.png"
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#信息提取出后所存放的文件
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get_info = "get_flag.txt"
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func(le,new,get_info)
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if __name__=='__main__':
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main()
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