Antoine Pultier fungiboletus

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Two Fast Methods of Generating True Random Numbers on the Arduino

Arduino true random number generator

B. Peng

December 2017

Abstract

The AVR series microcontrollers are a collection of cheap and versatile chips that are used in many applications ranging from hobbist projects to commercial infrastructure. One major problem for some hobbists is the lack of secure random number generation on the Arduino platform. The included pseudo-random number generator (PRNG) is very easy to defeat and is useless for any crypto-related uses. One recommendation from the Arduino Reference Manual is to use atmospheric noise from the chip's analog sensor pins as seed data^[6].
Unfortunately this method is extremely weak and should not be used to emulate a true random number generator (TRNG). Existing methods such as using the internal timer drift or using a dedicated generator are either too slow, requires extensive external hardware or modifications to the microcontroller's internal mech

Below is the list of modern JS frameworks and almost frameworks – React, Vue, Angular, Ember and others.

All files were downloaded from https://cdnjs.com and named accordingly. Output from ls command is stripped out (irrelevant stuff)

As-is (minified)

$ ls -lhS
566K Jan 4 22:03 angular2.min.js

	# Upsert function for pandas to_sql with postgres
	# https://stackoverflow.com/questions/1109061/insert-on-duplicate-update-in-postgresql/8702291#8702291
	# https://www.postgresql.org/docs/devel/sql-insert.html#SQL-ON-CONFLICT
	import pandas as pd
	import sqlalchemy
	import uuid
	import os


	def upsert_df(df: pd.DataFrame, table_name: str, engine: sqlalchemy.engine.Engine):

	#!/bin/bash

	# Raspberry Pi ZRAM script
	# Tuned for quad core, 1 GB RAM models
	# put me in /etc/init.d/zram.sh and make me executable
	# then run "sudo update-rc.d zram.sh defaults"

	modprobe zram
	echo 3 >/sys/devices/virtual/block/zram0/max_comp_streams
	echo lz4 >/sys/devices/virtual/block/zram0/comp_algorithm

	#!/bin/sh
	#
	# Pre-commit hook that verifies if all files containing 'vault' in the name
	# are encrypted.
	# If not, commit will fail with an error message
	#
	# File should be .git/hooks/pre-commit and executable
	FILES_PATTERN='.vault.\.yml$'
	REQUIRED='ANSIBLE_VAULT'

	// pre-render d3 charts at server side
	var d3 = require('d3')
	, jsdom = require('jsdom')
	, fs = require('fs')
	, htmlStub = '<html><head></head><body><div id="dataviz-container"></div><script src="js/d3.v3.min.js"></script></body></html>'

	jsdom.env({
	features : { QuerySelector : true }
	, html : htmlStub
	, done : function(errors, window) {

	<!doctype html>
	<html>
	<head>
	<meta charset="utf-8">
	<meta name="viewport" content="width=device-width, initial-scale=1" />
	<title>Enterprisify your Java Class Names! (by Hay Kranen)</title>
	<style>
	body {
	background: white;
	text-align: center;

	# to generate your dhparam.pem file, run in the terminal
	openssl dhparam -out /etc/nginx/ssl/dhparam.pem 2048