CTF二維碼題（01轉二維碼）

一個二維碼轉換網站：
https://merricx.github.io/qrazybox/

打印01字符串的長度：

print(len(str))

CTF python 0 1轉化為二維碼：

from PIL import Image
from zlib import *

MAX = 36 # 數字的長度為一個整數的平方（如36^2=1296)
pic = Image.new("RGB",(MAX,MAX))
str ="111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111100000001111001000000001100000001111101111111110011000010011111111101111101000001111111001001001100000101111101011111110101011000000111110101111101010001110101001001110100010101111101010001101101010101111100010101111101010001011001011101111100010101111111111111010101010000110111111111111111111111111101010110011000100111111110010011100101001111111011011011111110000010101111010101100011111001111101010111101001000000110000111111111101110010110011001100110000001111111111111111111111001110111110000111111100000000000000000001101101110101111100010110110111101001111000010111111100010101111010010001100101001011111101010101011001000110001101110001111101111010011110111010000111100001111100101001111000000010001011010001111100100100001101100001000010011101111100010110001101011110100110111001111111001000111011001000101111111111111111111111010001010000010111111111111101010001110000111111111100010101111101010001101111111111111100010101111101010001010100111111111100010101111101011111011111111111111111110101111101000001101001111111111100000101111101111111111111111111111111111101111100000001100111111111111100000001111111111111111111111111111111111111111111111111111111111111111111111111"

i=0
for y in range(0,MAX):
    for x in range(0,MAX):
        if(str[i] == '1'):
            pic.putpixel([x,y],(0,0,0))
        else:pic.putpixel([x,y],(255,255,255))
        i = i+1
pic.show()
pic.save("flag.png")

題目給出了一段全是01的數字串，且數字的長度為一個整數的平方（如25^2=625）時，有可能是以0、1表示黑或者白的一個像素，這樣就可以生成一個正方形的像素圖:

from PIL import Image
MAX = 25
pic = Image.new("RGB",(MAX, MAX))
str = "1111111000100001101111111100000101110010110100000110111010100000000010111011011101001000000001011101101110101110110100101110110000010101011011010000011111111010101010101111111000000001011101110000000011010011000001010011101101111010101001000011100000000000101000000001001001101000100111001111011100111100001110111110001100101000110011100001010100011010001111010110000010100010110000011011101100100001110011100100001011111110100000000110101001000111101111111011100001101011011100000100001100110001111010111010001101001111100001011101011000111010011100101110100100111011011000110000010110001101000110001111111011010110111011011"
i=0
for y in range (0,MAX):
    for x in range (0,MAX):
        if(str[i] == '1'):
            pic.putpixel([x,y],(0, 0, 0))
        else:
            pic.putpixel([x,y],(255,255,255))
        i = i+1
pic.show()
pic.save("flag.png")``

運行代碼后得到圖片，因為只有625像素圖片比較小。掃描二維碼得到Flag

其他知識補充：

MISC多種題總結（上）
MISC多種題型總結（下篇）

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