Dhruvil Patel dhruvilp

Fundamentals of System Design

Introduction to System Design
The System Design Interview
How to Answer System Design Questions
System Design Principles
How to Answer Web Protocol Questions in a System Design Interview
How to Cover Load Balancing in a System Design Interview
How to Answer Questions About CDNs in a System Design Interview
How to Answer Questions About APIs in System Design Interviews

Topics:

Foundations of Blockchain

Much of the use of blockchain is tied to the concept of “stores of value.” Thus it is important to understand the history and context of monetary instruments, fiat currency, and the innovation that blockchain brings as a store of value and a tool for a broad range of business applications. Learn how to explain the origin and workings of blockchain technology.

Transacting on the Blockchain

One of the most prolific and public applications of blockchain technology is to cryptocurrencies. As such, it is important to understand how cryptocurrencies work and when it is appropriate to use them. Understand the key elements of blockchain technology and how to apply it across business models. Learn how to explain the value of “alternative” stores of value such as cryptocurrencies.

Solving Problems with Blockchain

Understand when to apply blockchain technology, and just as importantly, when blockchain does not add value. Learn about distributed ledger technology, Bit

CTF Tools

CyberChef: https://gchq.github.io/CyberChef/
Md5Decrypt: https://md5decrypt.net/en/
Md5Decrypt: https://md5decrypt.net/en/HashFinder
HashCat: https://hashcat.net/wiki/doku.php?id=example_hashes
EXIF Data: https://exifdata.com/
Shodan (search engine): https://www.shodan.io/
Spiderfoot: https://www.spiderfoot.net/hx/
Exploit DB: https://www.exploit-db.com/google-hacking-database

	# source: https://www.moh10ly.com/retrieving-attachments-from-exchange-mailbox-using-python/


	from exchangelib import DELEGATE, IMPERSONATION, Account, Credentials, EWSDateTime, EWSTimeZone, Configuration, NTLM, GSSAPI, CalendarItem, Message, Mailbox, Attendee, Q, ExtendedProperty, FileAttachment, ItemAttachment, HTMLBody, Build, Version, FolderCollection


	credentials = Credentials(username='moh10ly\info', password='PWD')

	ews_url = 'https://mail.moh10ly.com/EWS/exchange.asmx'
	ews_auth_type = 'NTLM'

	// Get more Flutter packages and plugins at https://pub.dev

	import 'package:flutter/material.dart'; // Material UI widgets
	import 'package:http/http.dart' as http; // http package
	import 'dart:convert'; // json handler package
	import 'defaults.dart'; // default strings and constants

	// =============================================================================
	// FILE: weather_model.dart
	// =============================================================================

	1. Github Security Advisories: https://github.com/dart-lang/sdk/security/advisories
	2. CVE.report: https://cve.report/software/dart/dart_software_development_kit


	Android/iOS Scanning:
	1. https://github.com/MobSF/Mobile-Security-Framework-MobSF

	import React from "react";
	import { useState, useEffect } from "react";
	// Usage
	export default function App() {
	// Call our hook for each key that we'd like to monitor
	const happyPress = useKeyPress("h");
	const sadPress = useKeyPress("s");
	const robotPress = useKeyPress("r");
	const foxPress = useKeyPress("f");
	const enterPress = useKeyPress("Enter");

	import {useEffect} from 'react';

	export default function useIntervalHook(minutes = 5) {
	const interval = minutes * 60 * 1000;

	function refresh(){
	fetch('/api/**', {mode: 'no-cors', credentials: 'include'})
	.catch(error => {
	console.log(`There was a problem... ${error.message}`);
	});

	#!/bin/zsh
	#Ping & get DNS name from a list of IPs saved in a file

	#Prompt the user to enter a file name and its path.
	read -p "Enter the IP addresses file name / path:" FILE_PATH_NAME


	function check_host(){
	#if not the IP address value is empty
	if [[ -n $IP_ADDRESS ]]