1.环境配置（以Kali Linux下python2.7为例）

1）环境参数如下

root@kali:~/桌面# python --version
Python 2.7.18
root@kali:~/桌面# uname -a
Linux kali 5.4.0-kali3-amd64 #1 SMP Debian 5.4.13-1kali1 (2020-01-20) x86_64 GNU/Linux

2）安装密码学脚本需要使用的python库：wheel，gmpy2，binascii

a.安装wheel库

root@kali:~/桌面# python -m pip install wheel

b.安装gmpy2库

root@kali:~/桌面# python -m pip install gmpy2

2.运行解密脚本：

root@kali:~/桌面/RSA/6# python common_mode_rsa.py

1）解密脚本为：

#-*- coding:utf-8 -*-
import binascii
import gmpy2
e1 = 17
e2 = 65537
a = gmpy2.gcdext(e1,e2)   #拓展欧里几德算法
r = int(a[1])
s = int(a[2])

fo1 = open('flag.enc1','rb')
fo2 = open('flag.enc2','rb')
c1 = fo1.read()
c1 = int(c1.encode('hex'),16)
c2 = fo2.read()
c2 = int(c2.encode('hex'),16)
fo1.close()
fo2.close()
N = 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
m= (gmpy2.powmod(c1,r,N)*gmpy2.powmod(c2,s,N))%N      #计算明文，计算出的明文为16进制形式
flag = hex(m)
flag = binascii.a2b_hex(flag[2:]) # 将十六进制数字字符串转换为二进制数据（字符切片截取0x之后的）
print flag

2）得到flag：

PCTF{M4st3r_oF_Number_Th3ory}