[其他] 【愚公系列】2021年11月 攻防世界-进阶题-MISC-030(red_green)

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• ​​一、red_green​​
  
• ​​二、答题步骤​​
  
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• ​​1.zsteg​​
  
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• ​​总结​​
  
  
  
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#生成脚本from PIL import Imageimport osimport bitstring#image_name = 'flag.jpg'image_name = input("请输入当前文件夹下图片的名称>>>\n")current_path = os.path.dirname(__file__)with open(os.path.join(current_path,image_name),'rb') as f:  bin_content = bitstring.Bits(f)  im = Image.new("RGB",(1024,780),(255,0,0))  pim = im.load()  for i,val in enumerate(bin_content.bin):    if val == '0':      pim[i%1024,i/1024] = (0,255,0)  im.save(os.path.join(current_path,'red_green.png'))#还原脚本from PIL import Imageimport osimport bitstringimage_name = 'red_green.png'current_path = os.path.dirname(__file__)im = Image.open(os.path.join(current_path,image_name))image_width = im.size[0]image_height = im.size[1]# load pixelpim = im.load()bin_result = ''for row in range(image_height):  for col in range(image_width):    if pim[col,row][0] == 255:      bin_result += '1'    else:      bin_result += '0'with open(os.path.join(current_path,'result.jpg'),'wb') as f:  f.write(bitstring.BitArray(bin=bin_result).bytes)

zsteg -E b1,r,lsb,xy 2ec5da20345342909d2336aa7418afed.png > new.jpg

• zsteg