BUUCTF key不在这里

题目

解压之后是一个二维码

 

扫描之后，我们发现url中有一大串数字

https://cn.bing.com/search?q=key%e4%b8%8d%e5%9c%a8%e8%bf%99%e9%87%8c&m=10210897103375566531005253102975053545155505050521025256555254995410298561015151985150375568&qs=n&sp=-1&sc=0-38&sk=&cvid=2CE15329C18147CBA4C1CA97C8E1BB8C&first=1&FORM=BESBTB

 到网上抄个脚本跑一下

s='10210897103375566531005253102975053545155505050521025256555254995410298561015151985150375568'
temp = ''
 
while len(s):
    if int(s[:3]) < 127:
        temp += chr(int(s[:3]))
        s = s[3:]
    else:
        temp += chr(int(s[:2]))
        s = s[2:]
print(temp)

得到了被url编码的flag

flag%7B5d45fa256372224f48746c6fb8e33b32%7D

找个在线解url编码的网站解一下

得到了flag

flag{5d45fa256372224f48746c6fb8e33b32}