二、答题步骤

1.抓包

解法一：python脚本

from PIL import Image
exp = Image.open("exp.png") # 从winhex中最后一行下载的图片
cipher = Image.open("cipher.png") # 题目给的图片
new = Image.new("RGBA", size=exp.size)
for i in range(640):
	for j in range(480):
		y_p = exp.getpixel((i, j))
		c_p = cipher.getpixel((i, j))
		if y_p == c_p:
			pass
		else:
			new.putpixel((i,j), (255,255,255))
new.save("result.png")

解法二：stegsolve，file，ps
用stegsolve打开，随便调几个通道

用ps补全二维码扫码得到flag

flag：flag{#justdiffit}

总结

• stegsolve
• ps
• python