WeChall Training: Crypto - Caesar I

As on most challenge sites, there are some beginner cryptos, and often you get started with the good old caesar cipher.
I welcome you to the WeChall style of these training challenges
Enjoy!
Ciphertext
ESP BFTNV MCZHY QZI UFXAD ZGPC ESP WLKJ OZR ZQ NLPDLC LYO JZFC FYTBFP DZWFETZY TD ZTDPSSWNZNCN
题目：凯撒密码 解密文    http://www.wechall.net/challenge/training/crypto/caesar/index.php
解决：
#include<string.h>
#include<stdio.h>
#include<iostream>
using namespace std;

char *ciphertext = "RFC OSGAI ZPMUL DMV HSKNQ MTCP RFC JYXW BME MD AYCQYP YLB WMSP SLGOSC QMJSRGML GQ MGQCFFJAMAPA";
char plaintext[100];

int main()
{
        int len = strlen(ciphertext);
        for (int k = 0 ; k < 26 ; k++) {
                for (int i = 0 ; i < len ; i++) {
                        if (ciphertext != ' ') {
                                char ch = ciphertext;
                                int index = ch - 'A';
                                index = (index + k) % 26;
                                ch = 'A'+index;
                                plaintext = ch;
                        } else {
                                plaintext = ' ';
                        }
                }
                plaintext[len] = '\0';
                cout<<plaintext<<endl;
        }
        return 0;
}
运行结果可找到一段明文
THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG OF CAESAR AND YOUR UNIQUE SOLUTION IS OISEHHLCOCRC

请问楼主能描述一下加密过程嘛？代码用vs运行不了

行书忱 发表于 2020-3-6 16:13
请问楼主能描述一下加密过程嘛？代码用vs运行不了

就是列举0-25的偏移量啊