Encryption/Decryption Algorithm Gaming Project in C++

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3 months ago

#include <iostream>
#include <string>

using namespace std;

// Function to encrypt a message using Caesar cipher
string encrypt(const string& message, int shift) {
    string encryptedMessage = message;

    for (char& c : encryptedMessage) {
        if (isalpha(c)) {
            char base = islower(c) ? 'a' : 'A';
            c = (c - base + shift) % 26 + base;
        }
    }

    return encryptedMessage;
}

// Function to decrypt a message using Caesar cipher
string decrypt(const string& message, int shift) {
    return encrypt(message, 26 - shift); // Decryption is encryption with (26 - shift)
}

int main() {
    string message;
    int shift;

    cout << "Enter the message to encrypt: ";
    getline(cin, message);

    cout << "Enter the shift value (1-25): ";
    cin >> shift;

    if (shift < 1 || shift > 25) {
        cout << "Invalid shift value. It should be between 1 and 25." << endl;
        return 1;
    }

    // Encrypt the message
    string encryptedMessage = encrypt(message, shift);
    cout << "Encrypted message: " << encryptedMessage << endl;

    // Decrypt the message
    string decryptedMessage = decrypt(encryptedMessage, shift);
    cout << "Decrypted message: " << decryptedMessage << endl;

    return 0;
}

#include <iostream>

#include <string>

using namespace std;

// Function to encrypt a message using Caesar cipher

string encrypt(const string& message, int shift) {

string encryptedMessage = message;

for (char& c : encryptedMessage) {

if (isalpha(c)) {

char base = islower(c) ? 'a' : 'A';

c = (c - base + shift) % 26 + base;

}

return encryptedMessage;

}

// Function to decrypt a message using Caesar cipher

string decrypt(const string& message, int shift) {

return encrypt(message, 26 - shift); // Decryption is encryption with (26 - shift)

}

int main() {

string message;

int shift;

cout << "Enter the message to encrypt: ";

getline(cin, message);

cout << "Enter the shift value (1-25): ";

cin >> shift;

if (shift < 1 || shift > 25) {

cout << "Invalid shift value. It should be between 1 and 25." << endl;

return 1;

}

// Encrypt the message

string encryptedMessage = encrypt(message, shift);

cout << "Encrypted message: " << encryptedMessage << endl;

// Decrypt the message

string decryptedMessage = decrypt(encryptedMessage, shift);

cout << "Decrypted message: " << decryptedMessage << endl;

return 0;

}

Explanation:

Caesar Cipher Encryption (encrypt):
- The encrypt function shifts each letter in the input message by a specified number of positions in the alphabet.
- It loops through each character in the message:
  - If the character is a letter, it calculates its new position by shifting it and wraps around the end of the alphabet using modulo arithmetic.
  - The character is then updated with the new shifted value.
- Non-alphabetic characters remain unchanged.
Caesar Cipher Decryption (decrypt):
- The decrypt function reverses the encryption by shifting in the opposite direction.
- It uses the same encrypt function but shifts by 26 - shift to undo the encryption.
Main Function (main):
- Prompts the user to enter a message and a shift value.
- Encrypts the message using the provided shift value.
- Prints the encrypted message.
- Decrypts the encrypted message using the same shift value and prints the decrypted message.

Possible Enhancements:

Error Handling: Add more robust error handling for input validation and edge cases.
Different Ciphers: Implement other encryption algorithms (e.g., Vigenère cipher, RSA) for more secure encryption.
File Handling: Extend the program to read from and write to files for encrypting and decrypting larger texts.
GUI Interface: Develop a graphical user interface (GUI) for a more user-friendly experience.

Explanation:

Possible Enhancements:

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