Java tutorial
import java.security.NoSuchAlgorithmException; import java.security.SecureRandom; public class Main { public static void main(String[] args) throws NoSuchAlgorithmException { int numBytes = (new Integer("1111")).intValue(); SecureRandom srand = new SecureRandom(new byte[] { 1, 2, 3, 4 }); byte[] bytes = new byte[numBytes]; srand.nextBytes(bytes); System.out.println(new String(bytes)); } }