Java tutorial
/* * To change this license header, choose License Headers in Project Properties. * To change this template file, choose Tools | Templates * and open the template in the editor. */ package com.pamarin.income.util; import java.util.Random; import org.apache.commons.codec.binary.Base64; /** * * @author jittagornp */ public class StringRandom { public static String random2048bit() { byte[] r = new byte[256]; //Means 2048 bit Random random = new Random(); random.nextBytes(r); return Base64.encodeBase64String(r).replace("+", "_"); } }