helmithejoe

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

helmithejoe

// Arduino Speed Test Benchmarking Program
// Original Program Credit: Arduino.cc
// Modified By: Dan Watson
// synchannel.blogspot.com
// 1-29-2015

// This sketch is the speed test portion of the Arduino Show Info program
// http://playground.arduino.cc/Main/ShowInfo

// Certain tests may not compile/run for all boards. Comment them out as necessary:

helmithejoe

This will guide you through setting up a replica set in a docker environment using.

• Docker Compose
• MongoDB Replica Sets
• Mongoose
• Mongoose Transactions

Thanks to https://gist.github.com/asoorm for helping with their docker-compose file!

helmithejoe

#include <iostream>
#include <string>
#include <curl/curl.h>


static size_t WriteCallback(void *contents, size_t size, size_t nmemb, void *userp)
{
    ((std::string*)userp)->append((char*)contents, size * nmemb);
    return size * nmemb;
}

helmithejoe

Docker - How to cleanup (unused) resources

Once in a while, you may need to cleanup resources (containers, volumes, images, networks) ...

delete volumes

// see: https://github.com/chadoe/docker-cleanup-volumes

$ docker volume rm $(docker volume ls -qf dangling=true)

$ docker volume ls -qf dangling=true | xargs -r docker volume rm

helmithejoe

import ftplib
import os
import re

"""
MIT license: 2017 - Jwely

Example usage:
``` python
import ftplib

helmithejoe

# see https://github.com/cmaessen/docker-php-sendmail for more information

FROM php:5-fpm

RUN apt-get update && apt-get install -q -y ssmtp mailutils && rm -rf /var/lib/apt/lists/*

RUN docker-php-ext-install mysql mysqli sysvsem

RUN pecl install xdebug-2.5.5 \
    && echo "zend_extension=$(find /usr/local/lib/php/extensions/ -name xdebug.so)" > /usr/local/etc/php/conf.d/xdebug.ini \

helmithejoe

#!/bin/sh

# This is a skeleton of a bash daemon. To use for yourself, just set the
# daemonName variable and then enter in the commands to run in the doCommands
# function. Modify the variables just below to fit your preference.

daemonName="DAEMON-NAME"

pidDir="."
pidFile="$pidDir/$daemonName.pid"

helmithejoe

#!/bin/sh
# this script was initially written for Redhat/CentOS
# file is /etc/cron.daily/diskAlert.cron
# requires enabling outgoing sendmail from localhost to a valid 
# smtp server, which is usually disabled by default
ADMIN="jausten@adomain.com,another@adomain.com"
THRESHOLD=90

df -PkH | grep -vE '^Filesystem|tmpfs|cdrom|media' | awk '{ print $5 " " $6 }' | while read output;
do

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server {

    set $host_path "/var/www/yoursite.com";
    access_log  /var/www/yoursite.com/log/access.log  main;

    server_name  yoursite.com www.yoursite.com;

    root   $host_path/htdocs;
    set $yii_bootstrap "index.php";