Szyfr Cezara

Opis problemu

Szyfrowanie

Implementacja

#include <iostream>

using namespace std;

string encryptCaesar(string message, int key) {
    string result = "";
    char encrypted;

    key %= 26;

    for(char letter : message) {
        encrypted = letter + key;
        if(encrypted > 'z') {
            encrypted = encrypted - 'z' + 'a' - 1;
        }

        result += encrypted;
    }

    return result;
}

int main() {
    string message = "alamakota";
    int key = 3;

    string encrypted = encryptCaesar(message, key);

    cout << encrypted << endl;

    return 0;
}

Deszyfrowanie

Implementacja

#include <iostream>

using namespace std;

string decryptCaesar(string encrypted, int key) {
    string result = "";
    char decrypted;

    key %= 26;

    for(char letter : encrypted) {
        decrypted = letter - key;
        if(decrypted < 'a') {
            decrypted = 'z' - ('a' - decrypted - 1);
        }

        result += decrypted;
    }

    return result;
}

int main() {
    string encrypted = "dodpdnrwd";
    int key = 3;

    string decrypted = decryptCaesar(encrypted, key);

    cout << decrypted << endl;

    return 0;
}