What are some basic concepts of cryptography in Java?

What are some basic concepts of cryptography in Java?

In Java, cryptography involves concepts like encryption, decryption, hashing, and digital signatures. Would you like to know more about a specific area?

Yes, can you explain how encryption and decryption work?

Sure! Encryption transforms plaintext into ciphertext using an algorithm and a key, while decryption reverses this process to retrieve the original plaintext.

What libraries can I use for cryptography in Java?

You can use libraries like Java Cryptography Architecture (JCA), Bouncy Castle, and Apache Commons Crypto for cryptographic operations.

Can you provide a simple code example for AES encryption?

Absolutely! Here's a simple example:

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

public class AESCrypto {
    public static void main(String[] args) throws Exception {
        KeyGenerator keyGen = KeyGenerator.getInstance("AES");
        keyGen.init(128);
        SecretKey secretKey = keyGen.generateKey();

        Cipher cipher = Cipher.getInstance("AES");
        cipher.init(Cipher.ENCRYPT_MODE, secretKey);
        byte[] encrypted = cipher.doFinal("Hello World".getBytes());
        System.out.println("Encrypted: " + new String(encrypted));
    }
}

This code generates a key and encrypts the string "Hello World".