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XCTF的新手逆向题

题目是pyc的后缀，反编译得到python源码

#!/usr/bin/env python
# encoding: utf-8

import base64
def encode(message):
    s = ''
    for i in message:
        x = ord(i) ^ 32
        x = x + 16
        s += chr(x)
    
    return base64.b64encode(s)

correct = 'XlNkVmtUI1MgXWBZXCFeKY+AaXNt'
flag = ''
print 'Input flag:'
flag = raw_input()
if encode(flag) == correct:
    print 'correct'
else:
    print 'wrong'

根据源码逆出flag

#!/usr/bin/env python
# encoding: utf-8

import base64

correct = 'XlNkVmtUI1MgXWBZXCFeKY+AaXNt'
def decode(message):
    s=''
    for i in message:
        x=ord(i)
        x=x-16
        x=x^32
        s+=chr(x)
    return s

print decode(base64.b64decode(correct))