import javax.crypto.KeyGenerator; import javax.crypto.SecretKey; public class Main { public static void main(String[] argv) throws Exception { // Generate a DES key KeyGenerator keyGen = KeyGenerator.getInstance("DES"); SecretKey key = keyGen.generateKey(); // Generate a Blowfish key keyGen = KeyGenerator.getInstance("Blowfish"); key = keyGen.generateKey(); // Generate a triple DES key keyGen = KeyGenerator.getInstance("DESede"); key = keyGen.generateKey(); } }