题目名称：反编译
题目描述：
分析
题目给出一个pyc后缀的文件，需要使用uncompyle6模块去还原成py文件
uncompyle6简介
uncompyle6 是一个 Python 反编译器，它能够将 Python 字节码（.pyc 文件）转换回源代码（.py 文件）。
解题过程：
Step1：下载uncompyle6包
pip install uncompyle6
注意 版本问题
uncompyle6默认只支持3.8及以下版本
如何修改？（我这里是python3.11.3）
Python311\Lib\site-packages\uncompyle6\bin\uncompile.py
修改位置：Python311\Lib\site-packages\xdis\magics.py
Step2：在uncompyle6.exe目录下运行反编译命令
Step3：编写逆算法
生成的py文件内容如下：
# uncompyle6 version 3.7.4 # Python bytecode 2.7 (62211) # Decompiled from: Python 3.11.3 (tags/v3.11.3:f3909b8, Apr 4 2023, 23:49:59) [MSC v.1934 64 bit (AMD64)] # Embedded file name: b'C:\\Users\\CD\\Desktop\\\xb7\xb4\xb1\xe0\xd2\xeb\\crypto11.py' # Compiled at: 2019-11-24 10:36:35 import base64 def encode1(ans): s = '' for i in ans: x = ord(i) ^ 18 x = x + 19 s += chr(x) return s def encode2(ans): s = '' for i in ans: x = ord(i) + 66 x = x ^ 32 s += chr(x) return s def encode3(ans): return base64.b16encode(ans) flag = ' ' print 'Please Input your flag:' flag = raw_input() final = 'E9F3E8EA9EECE859E5555BA0A05F555A555CEBE955EC59E5EC5AECE858E9ECE555EB5FE6E8E4' if encode3(encode2(encode1(flag))) == final: print 'correct' else: print 'wrong'
逆运算脚本如下：
import base64 def decode2(ans): s = '' for i in ans: j=ord(i) x=j ^ 32 x-=66 s += chr(x) return s def decode1(ans): s = '' for i in ans: j=ord(i) x=j-19 x=x^18 s += chr(x) return s final = 'E9F3E8EA9EECE859E5555BA0A05F555A555CEBE955EC59E5EC5AECE858E9ECE555EB5FE6E8E4' s = base64.b16decode(final) s = decode1(decode2(s)) print s
相关资源：
链接：https://pan.baidu.com/s/13S5xdwEvsb1H0nLTlyzMAA
提取码：25fq
