ctfshow-Crypto详细完整writeup

每天都要加油啊！每天更新4题左右  -----2024-01-02 11:30:57

1.密码学签到

原题：密文是：}wohs.ftc{galf

逆着读得到flag：flag{ctf.show}

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2.crypto2

原题：

查看代码

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为JSFUCK，直接F12控制台中按住回车得到flag：flag{3e858ccd79287cfe8509f15a71b4c45d}

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3.crypto3

有的浏览器乱码，可以下载到本地，然后txt打开，发现一堆表情。为aaencode颜文字加密

同样可以F12控制台中直接解码

得到flag：flag{js_da_fa_hao}

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4.crypto4

p=447685307 q=2037 e=17

RSA算d，非常简单，以下给出python解题脚本：

# -*- coding:utf-8 -*-
""" 
作者:Wang Xinwei
日期:2023年12月29日
"""
from Crypto.Util.number import *
P=447685307
Q=2037
E=17
N=P*Q
phi=(P-1)*(Q-1)    #欧拉函数
d=inverse(E,phi)    #求解d
print(d)

新手看不懂的话，直接去网上查资料，这是每个人必经的学习之路。

5.crypto5

p=447685307 q=2037 e=17 c=704796792

提交flag{m}

欧拉函数为phi=(p-1)*(q-1)

d=inverse(e,phi)

m=pow(c,d,n)