参考自:https://www.cnblogs.com/ECJTUACM-873284962/p/6412212.htmlSafecracker Time Limit: 2 Seconds      Memory Limit: 65536 KB === Op tech briefing, 2002/11/02 06:42 CST === "The item is locked in a Klein safe behind a painting in the second-floor librar…

题目传送门 /* 暴力:纯暴力,在家水水 */ #include <cstdio> #include <cstring> #include <algorithm> #include <iostream> #include <string> #include <vector> #include <cmath> using namespace std; ; const int INF = 0x3f3f3f3f; ]; ]; i…

Safecracker Time Limit: 2 Seconds      Memory Limit: 65536 KB === Op tech briefing, 2002/11/02 06:42 CST === "The item is locked in a Klein safe behind a painting in the second-floor library. Klein safes are extremely rare; most of them, along with K…

https://vjudge.net/contest/67836#problem/F "The item is locked in a Klein safe behind a painting in the second-floor library. Klein safes are extremely rare; most of them, along with Klein and his factory, were destroyed in World War II. Fortunately…

题目链接:http://acm.zju.edu.cn/onlinejudge/showProblem.do?problemId=6 题目大意:给你加密方式,请你求出解密. 直接逆运算搞,用到同余定理 #include <cstdio> #include <cstdlib> #include <string> #include <iostream> #include <cstring> #include <algorithm> #inc…

今天在ZOJ上做了道很简单的题目是关于加密解密问题的,此题的关键点就在于求余的逆运算: 比如假设都是正整数 A=(B-C)%D 则 B - C = D*n + A 其中 A < D 移项 B = A+C + D*n 当B<D时,两边对D取摸,  B = B%D = ( A+C + D*n )%D = (A+C)%D 由此可得此题答案,见代码 #include <cstdio> #include <cstring> int main() { ]; ],ctext[]; w…

Do the Untwish 题目链接:http://acm.zju.edu.cn/onlinejudge/showProblem.do?problemCode=1006 题意:给定密文按公式解密 注意点:pcode = (ccode + i)%28;的使用 贴代码: 1 //Problem Name: Do the Untwish 2 //Source: ZOJ 1006 3 //Author: jinjin18 4 //Main idea: easy to solve 5 //Languag…

One day, Nobita found that his computer is extremely slow. After several hours' work, he finally found that it was a virus that made his poor computer slow and the virus was activated by a misoperation of opening an attachment of an email. Nobita did…

PHP服务端与客户端交互或者提供开放API时,通常需要对敏感的数据进行加密,这时候rsa非对称加密就能派上用处了. 举个通俗易懂的例子,假设我们再登录一个网站,发送账号和密码,请求被拦截了. 密码没加密,那攻击者就直接拿到了密码,这是最搓的. 密码加密了,是不可逆加密,那攻击者只需要模拟那个请求即可登录. 密码加密了,是可逆加密,其中携带有时间等参数,后台可以根据时间等参数来判断是否有效,但因为是在前端加密,其加密方式也能在代码中找到,找到加密方式就可以得出解密方式. 但是如果我们使用非对称加密…

大家知道,在应用程序中进行数据库操作需要连接字符串,而如果没有连接字符串,我们就无法在应用程序中完成检索数据,创建数据等一系列的数据库操作.当有人想要获取你程序中的数据库信息,他首先看到的可能会是Web.Config文件.而多数情况下我们不希望那些高度敏感的数据信息被别人看到,所以我们就需要对其加密.这篇文章我将演示怎么实现加密和解密数据库的连接字符串. 目录 1.创建一个新项目 2.添加一个连接字符串 3.加密连接字符串 4.解密连接字符串 需要的工具 Visual Studio SQL Se…