How can I implement advanced encryption in Java?

How can I implement advanced encryption in Java?

You can use libraries like Bouncy Castle or Java Cryptography Extension (JCE) for advanced encryption. What specific algorithm are you interested in?

I'm interested in AES encryption. Can you show me an example?

Sure! Here's a simple example of AES encryption in Java using JCE:

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

public class AESExample {
    public static void main(String[] args) throws Exception {
        String data = "Hello, World!";
        KeyGenerator keyGen = KeyGenerator.getInstance("AES");
        keyGen.init(128);
        SecretKey secretKey = keyGen.generateKey();

        Cipher cipher = Cipher.getInstance("AES");
        cipher.init(Cipher.ENCRYPT_MODE, secretKey);
        byte[] encryptedData = cipher.doFinal(data.getBytes());

        System.out.println("Encrypted Data: " + new String(encryptedData));
    }
}

This will encrypt the string using AES.

How do I decrypt the data after encryption?

To decrypt the data, you need to initialize the cipher in decrypt mode with the same key. Here's how you can do it:

cipher.init(Cipher.DECRYPT_MODE, secretKey);
byte[] decryptedData = cipher.doFinal(encryptedData);
System.out.println("Decrypted Data: " + new String(decryptedData));

Make sure to keep the secret key safe!