Wednesday, March 31, 2021

[How To] Install Free SSL Certificate for WordPress

In this tutorial, I have installed a free SSL certificate from Let's Encrypt using the Certbot tool on Google Cloud Platform VM running Debian OS that hosts a WordPress site using Apache server. You can follow similar steps for other Cloud providers / OS distributions / CMS vendors / Web servers.

Part-1: Configure Virtual Host for your domain on Apache

cd /var/www/html

wp option update home ''

wp option update siteurl ''

sudo nano /etc/apache2/sites-available/

sudo apache2ctl configtest

sudo a2ensite

sudo systemctl reload apache2

Friday, March 12, 2021

Random Number Generation in C++



//  main.cpp

//  VaultBox


//  Created by Devharsh Trivedi on 3/11/21.


#include <iostream>

#include <iomanip>

#include <string>

#include <map>

#include <random>

#include <cmath>

#include <vector>

int main(int argc, const char * argv[]) {

    std::random_device ranDev;

    unsigned int num_ranDev = ranDev();

    std::cout << num_ranDev << std::endl;

    std::mt19937 mtGen(num_ranDev);

    std::vector<unsigned long> indexes(10);


    iota(indexes.begin(), indexes.end(), 0);

    for(int i=0; i<10; i++) {

        std::cout << indexes[i] << "\t";


    std::cout << std::endl;

Thursday, March 11, 2021

[How To] Save as an unlocked PDF

Steps to save a locked (password protected) PDF as an unlocked PDF:

  1. Download / Save / Copy the locked PDF to a folder
  2. Open Google Chrome
  3. Go to File Menu >> Open File >> Select your locked PDF
  4. Enter password
  5. Click on the Print button and select Save as a PDF
  6. The saved PDF will be unlocked