2020邑网杯—“扫地队伍“解出题目WP

MISC题目附件
链接:https://pan.baidu.com/s/1c5Hadg3wbg2W3xbhh-_tsQ 密码:50kx

题目四-密码学

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根据题目提供的线索奇点偶横，就判断出是摩斯密码

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Key：AFDS635DSZEMIKT6

题目五-跨站

根据题目的指示来执行alert（）来获取key
直接输入?name=<script>alert(/xss/)</script>

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Key：C637E6B48278C3A7

流量分析

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筛选HTTP协议
一个一个的查看一下post上传的文件，用追踪TCP流查看，结果发现第156个包里面有一个504B0304的十六进制头，就可以看出是一个ZIP包

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然后，把这一整串的十六进制复制到一个文本里面，然后用010导入十六进制，然后保存为zip

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解压之后，找了几个文件，才发现在这个文件里面

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Key：76D3F61F0E75518B

另一道例题https://www.cnblogs.com/dachuanduan/p/9437160.html

图片隐写——XS.png

根据题目提示，放大图片，发现在图片中部有一些奇怪的像素点:

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使用 Python 脚本读出所有，或中间这一部分的像素点:

import zlib
import binascii
from PIL import Image

pic = Image.open("xs.png")
strtxt = open('c.txt','a')
width,height = pic.size
for y in xrange(height):
    for x in xrange(width):
        strtxt.write(str(pic.getpixel((x,y))))
strtxt.close()

生成一个c.txt文件

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里面有一些不一样的像素点，把它提取出来
50 55 102 53 97 56 55 48 55 101 49 51 51 51 102 97
正好 16 位，数值都小于 127，使用十进制转换ASCII编码

转码传送门http://www.ab126.com/goju/1711.html
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得出Key：27f5a8707e1333fa

图片隐写——dandelion.jpg

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打开图片看上去很普通，看一下图片属性

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有一个备注QR Code

用winhex或者010打开

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有一大串二进制

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在下面看到了QR Code字段，就尝试一下把所有二进制转换为一个二维码

11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111100000000000000000000000000000000000000000000000000000000000000011111111111111111111111111100000000011111111111111111100000000011111111111111111111111111100000000000000000000000000000000000011111111100000000000000000000000000000000000000000000000000000000000000011111111111111111110000000000000000000000000000000000000000000000000000000000000001111111111111111111111111110000000001111111111111111110000000001111111111111111111111111110000000000000000000000000000000000001111111110000000000000000000000000000000000000000000000000000000000000001111111111111111111000000000000000000000000000000000000000000000000000000000000000111111111111111111111111111000000000111111111111111111000000000111111111111111111111111111000000000000000000000000000000000000111111111000000000000000000000000000000000000000000000000000000000000000111111111111111111100000000000000000000000000000000000000000000000000000000000000011111111111111111111111111100000000011111111111111111100000000011111111111111111111111111100000000000000000000000000000000000011111111100000000000000000000000000000000000000000000000000000000000000011111111111111111110000000000000000000000000000000000000000000000000000000000000001111111111111111111111111110000000001111111111111111110000000001111111111111111111111111110000000000000000000000000000000000001111111110000000000000000000000000000000000000000000000000000000000000001111111111111111111000000000000000000000000000000000000000000000000000000000000000111111111111111111111111111000000000111111111111111111000000000111111111111111111111111111000000000000000000000000000000000000111111000000000000000000000000000000000000000000000000001111111111111111111000000000000000000000000000000000000000000000000000000000000000111111111111111111111111111000000000111111111111111111000000000111111111111111111111111111000000000000000000000000000000000000111111111000000000000000000000000000000000000000000000000000000000000000111111111111111111100000000000000000000000000000000000000000000000000000000000000011111111111111111111111111100000000011111111111111111100000000011111111111111111111111111100000000000000000000000000000000000011111111100000000000000000000000000000000000000000000000000000000000000011111111111111111110000000000000000000000000000000000000000000000000000000000000001111111111111111111111111110000000001111111111111111110000000001111111111111111111111111110000000000000000000000000000000000001111111110000000000000000000000000000000000000000000000000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以上就是需要的二进制

在这里说一下，前段时间打2020年强网杯，也遇到一题也要转二维码，但是那个脚本在这里转换出来是不行的，那个是定义好二维码图片的高度和宽度，并且把二进制直接写入脚本里面；但是这题的脚本并没有定义二维码图片的高度和宽度，直接自动生成二维码，但是是通过文本里的二进制进行转换。

在这里插入图片描述

看，就是这个样子，所以不能用那个脚本

然后我就提供一下这题需要转换的脚本

import zlib
import binascii
from PIL import Image

f = open('777.txt','r')
string = f.read()
f.close()

MAX_num = len(string)
MAX=int(MAX_num ** 0.5)
pic = Image.new("RGB", (MAX,MAX))

i = 0
for y in range(0, MAX):
    for x in range(0, MAX):
	if(string[i] == '0'):
	    pic.putpixel([x, y], (0, 0, 0))
	else:
	    pic.putpixel([x, y], (255, 255, 255))
	i = i + 1

pic.show()
pic.save("flag000.png")

在这里插入图片描述
生成了一张png图片，但是发现，这个二维码是歪了，并且右下角有一半被移到左边了，这时候，法力高深的人就可以用肉眼来识别二维码，但是我是小白就只能用PS软件来加持一下

在这里插入图片描述
用PS拉了大概几分钟，就拉出来了差不多像样子的二维码
用微信扫一下

在这里插入图片描述
得出Key：b7f8ebd3480c2e6a

2020邑网杯—“扫地队伍“解出题目WP

2020邑网杯—“扫地队伍“解出题目WP

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