Vincent Kobel vkobel

Notes on The Innovator’s Dilemma: When New Technologies Cause Great Firms to Fail

Book by: Clayton M. Christensen, Cambridge, Massachusetts: Harvard Business School Press, 1997
Prepared by: B.B. McBreen. See [PDF][1] (more readable but it's not plain text)

Summary

Market progress is separate from technology progress. Customers do not always know what they need.
Innovation requires resource allocation which is extraordinarily difficult for disruptive technologies.
Disruptive technology needs a new market. Old customers are less relevant. Disruptive technology is a marketing problem, not a technological one.

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

Typing vagrant from the command line will display a list of all available commands.

Be sure that you are in the same directory as the Vagrantfile when running these commands!

Creating a VM

vagrant init -- Initialize Vagrant with a Vagrantfile and ./.vagrant directory, using no specified base image. Before you can do vagrant up, you'll need to specify a base image in the Vagrantfile.
vagrant init <boxpath> -- Initialize Vagrant with a specific box. To find a box, go to the public Vagrant box catalog. When you find one you like, just replace it's name with boxpath. For example, vagrant init ubuntu/trusty64.

Starting a VM

vagrant up -- starts vagrant environment (also provisions only on the FIRST vagrant up)

Cryptographic Best Practices

Putting cryptographic primitives together is a lot like putting a jigsaw puzzle together, where all the pieces are cut exactly the same way, but there is only one correct solution. Thankfully, there are some projects out there that are working hard to make sure developers are getting it right.

The following advice comes from years of research from leading security researchers, developers, and cryptographers. This Gist was [forked from Thomas Ptacek's Gist][1] to be more readable. Additions have been added from

	# setup vagrant
	gem install vagrant
	vagrant box add lucid32 http://files.vagrantup.com/lucid32.box
	mkdir my_vagrant_test
	cd my_vagrant_test
	vagrant init lucid32
	vim Vagrantfile
	vagrant up
	vagrant ssh

	package main

	import (
	"fmt"
	"reflect"
	)

	type Foo struct {
	FirstName string `tag_name:"tag 1"`
	LastName string `tag_name:"tag 2"`

	using System;
	using System.Reactive.Linq;
	using System.Windows;
	using System.Windows.Controls;
	using System.Windows.Input;

	namespace RxDragAndDrop {

	public partial class MainWindow : Window {

	# Initialize the scroll
	page = es.search(
	index = 'yourIndex',
	doc_type = 'yourType',
	scroll = '2m',
	search_type = 'scan',
	size = 1000,
	body = {
	# Your query's body
	})

	import sys,os
	import curses

	def draw_menu(stdscr):
	k = 0
	cursor_x = 0
	cursor_y = 0

	# Clear and refresh the screen for a blank canvas
	stdscr.clear()

	# -- coding: utf-8 --

	def Ord(ch): return ord(ch) - ord('A') # convert A-Z to 0-25
	def Chr(ch): return chr(ch + ord('A')) # convert 0-25 to A-Z
	def Text(s): return "".join(ch for ch in s if ch in "ABCDEFGHIJKLMNOPQRSTUVWXYZ")

	Rotors = { # name: (wiring, notches)
	"I": ("EKMFLGDQVZNTOWYHXUSPAIBRCJ", "Q"), # 1930 Enigma I
	"II": ("AJDKSIRUXBLHWTMCQGZNPYFVOE", "E"), # 1930 Enigma I
	"III": ("BDFHJLCPRTXVZNYEIWGAKMUSQO", "V"), # 1930 Enigma I