###这里记载了逆向部分题目的解法###
.题目一Py交易 https://cgctf.nuptsast.com/challenges#Re
题目给出了一个python的pyc文件这是python的编译中间文件,使用地址https://tool.lu/pyc/ 进行python的反编译,得到如下代码:
'''
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'
'''
根据代码提示:编写decode代码如下:使用python3.7
'''
import base64
correct = 'XlNkVmtUI1MgXWBZXCFeKY+AaXNt'
ch=base64.b64decode(correct)
s=''
for i in ch:
x=i-16
x=x^32
s+=chr(x)
print(s)
'''
得到flag nctf{d3c0mpil1n9_PyC}