QuantumResistantCryptoDemo.java

package java24.crypto;

import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.Signature;
import java.security.PrivateKey;
import java.security.PublicKey;

/**
 * Java 24 Quantum-Resistant Cryptography (JEPs 496 & 497) Demonstrates post-quantum cryptographic algorithms
 * NOTE: This feature introduces ML-KEM and ML-DSA algorithms
 */
public class QuantumResistantCryptoDemo
{
	public static void main(String[] args)
	{
		System.out.println("=== Java 24 Quantum-Resistant Cryptography (JEPs 496 & 497) ===\n");

		System.out.println("Overview:");
		System.out.println("--------");
		System.out.println("Java 24 introduces post-quantum cryptographic algorithms to prepare");
		System.out.println("for future quantum computing threats.\n");

		System.out.println("Key Algorithms:");
		System.out.println("- ML-KEM (Module-Lattice-Based Key Encapsulation Mechanism)");
		System.out.println("- ML-DSA (Module-Lattice-Based Digital Signature Algorithm)\n");

		System.out.println("Example: ML-DSA Digital Signature");
		System.out.println("--------------------------------");
		try
		{
			// Generate key pair using ML-DSA
			KeyPairGenerator keyGen = KeyPairGenerator.getInstance("ML-DSA");
			KeyPair keyPair = keyGen.generateKeyPair();

			PrivateKey privateKey = keyPair.getPrivate();
			PublicKey publicKey = keyPair.getPublic();

			System.out.println("Key pair generated successfully");
			System.out.println("Algorithm: " + publicKey.getAlgorithm());

			// Sign data
			Signature signature = Signature.getInstance("ML-DSA");
			signature.initSign(privateKey);
			byte[] data = "Important data to sign".getBytes();
			signature.update(data);
			byte[] digitalSignature = signature.sign();

			System.out.println("Data signed successfully");
			System.out.println("Signature length: " + digitalSignature.length + " bytes");

			// Verify signature
			signature.initVerify(publicKey);
			signature.update(data);
			boolean verified = signature.verify(digitalSignature);

			if (verified)
			{
				System.out.println("Signature verified successfully!");
			}
			else
			{
				System.out.println("Signature verification failed!");
			}
		}
		catch (Exception e)
		{
			System.out.println("Note: ML-DSA may not be available in all Java 24 implementations");
			System.out.println("Error: " + e.getMessage());
			System.out.println("\nExample code structure:");
			System.out.println("""
					// Generate key pair
					KeyPairGenerator keyGen = KeyPairGenerator.getInstance("ML-DSA");
					KeyPair keyPair = keyGen.generateKeyPair();
					
					// Sign data
					Signature signature = Signature.getInstance("ML-DSA");
					signature.initSign(keyPair.getPrivate());
					byte[] data = "Important data".getBytes();
					signature.update(data);
					byte[] digitalSignature = signature.sign();
					
					// Verify signature
					signature.initVerify(keyPair.getPublic());
					signature.update(data);
					boolean verified = signature.verify(digitalSignature);
					""");
		}

		System.out.println("\nKey Features:");
		System.out.println("- ML-KEM: Key encapsulation mechanism");
		System.out.println("- ML-DSA: Digital signature algorithm");
		System.out.println("- Post-quantum security");
		System.out.println("- Future-proof cryptography");
		System.out.println("- NIST standardized algorithms");

		System.out.println("\nBenefits:");
		System.out.println("- Protection against quantum computing threats");
		System.out.println("- Future-proof security");
		System.out.println("- Standardized algorithms (NIST)");
		System.out.println("- Long-term security");
		System.out.println("- Migration path for existing systems");

		System.out.println("\nUse Cases:");
		System.out.println("- Long-term data protection");
		System.out.println("- Secure communications");
		System.out.println("- Digital signatures");
		System.out.println("- Key exchange");
		System.out.println("- Future-proof applications");

		System.out.println("\nNote: Quantum-resistant cryptography is introduced in Java 24 (JEPs 496 & 497).");
		System.out.println("These algorithms prepare applications for the post-quantum era.");
	}
}