CTF | bugku | 速度要快

• 检查源码时发现有

<!-- OK ,now you have to post the margin what you find -->

• 检查响应头发现有

flag: 6LeR55qE6L+Y5LiN6ZSZ77yM57uZ5L2gZmxhZ+WQpzogTWpZNE9USTU=

• 然后写代码爬网页

'''
@Modify Time      @Author
------------      -------    http://123.206.87.240:8002/web6/
2019/9/7 16:40   laoalo
'''

import requests
import base64

url='http://123.206.87.240:8002/web6/'

response = requests.session()
head = response.get(url=url).headers
str1 = base64.b64decode(head['flag'])
flag = base64.b64decode(repr(str1).split(':')[1])
# flag = base64.b64decode(head['flag']).decode('utf-8').split(':')[1]
# print(flag)
data = {'margin':flag}
key = response.post(url=url,data=data).text
print(key)

---

---

记一次错误的写法：

            

• 原因

flags = base64.b64decode(head['flag']).decode('utf-8').split(':')[1]  # 将flag从respond解析出来，结果是str.
flag = base64.b64decode(flags)  # 在post的时候也需要编码,原来的码缺这一步

• repr() 函数将对象转化为供解释器读取的形式。返回值：string   参数：object

• '''
  @Modify Time      @Author
  ------------      -------    http://123.206.87.240:8002/web6/
  2019/9/7 16:40   laoalo
  '''
  
  import requests
  import base64
  
  url='http://123.206.87.240:8002/web6/'
  
  response = requests.session()
  head = response.get(url=url).headers
  # str1 = base64.b64decode(head['flag'])
  #
  # print("答案的：",repr(str1).split(':')[1],type(repr(str1).split(':')[1]))
  # print("我的：",base64.b64decode(head['flag']).decode('utf-8').split(':')[1])
  #
  # flag = base64.b64decode(repr(str1).split(':')[1])
  # print(flag)
  flags = base64.b64decode(head['flag']).decode('utf-8').split(':')[1]  # 将flag从respond解析出来，结果是str.
  flag = base64.b64decode(flags)  # 在post的时候也需要上传
  print(flag)
  data = {'margin':flag}
  key = response.post(url=url,data=data).text
  print(key)

  修改后