Why XKCD Comic about the 'correcthorsebatterystaple' password

WhyCorrectHorseBatteryStaple.ipynb

{
 "metadata": {
  "name": "",
  "signature": "sha256:ae505b1f6f359c83b7cb065124e505db9a6b6179e071ae488fabf92a1377aac0"
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 "nbformat": 3,
 "nbformat_minor": 0,
 "worksheets": [
  {
   "cells": [
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "![](http://imgs.xkcd.com/comics/password_strength.png)"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "import hashlib"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 1
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "# diese Hash-Algorithmen sind \u00fcblich\n",
      "hashlib.algorithms"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 2,
       "text": [
        "('md5', 'sha1', 'sha224', 'sha256', 'sha384', 'sha512')"
       ]
      }
     ],
     "prompt_number": 2
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "# diese Funktion wandelt Kennw\u00f6rter in Hashs um\n",
      "def md5(pw):\n",
      "    return hashlib.md5(str(pw)).hexdigest()"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 3
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "# probieren wir es mal\n",
      "md5('kennwort')"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 18,
       "text": [
        "'97ac58249ee2e4199920167d5e216b9a'"
       ]
      }
     ],
     "prompt_number": 18
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Hier eine Password-Datenbank"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "stolenpassworddatabase = {\n",
      "    'user1': '098f6bcd4621d373cade4e832627b4f6',\n",
      "    'user2': '5f4dcc3b5aa765d61d8327deb882cf99',\n",
      "    'user3': '03aadf99da97bfedcbf57fd8484546a5',\n",
      "    'user4': '54ac51eb226136ea0bd7ab01c85ef7c5'\n",
      "    }"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 5
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Hier die Kennw\u00f6rter, die wir testen wollen"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "trythisones = [\n",
      "    'superkennwort',\n",
      "    'A',\n",
      "    'B',\n",
      "    'RichtigerPferdeBatterieStapel',\n",
      "]"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 20
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Hier die Funktion, die alles durchprobiert"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "for pw in trythisones:\n",
      "    for username, passwordhash in stolenpassworddatabase.iteritems():\n",
      "        if md5(pw) == passwordhash:\n",
      "            print('Gefundener Zugang: \\'%s\\' mit Kennwort \\'%s\\'' % (username, pw))"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "Gefundener Zugang: 'user4' mit Kennwort 'superkennwort'\n"
       ]
      }
     ],
     "prompt_number": 21
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 7
    }
   ],
   "metadata": {}
  }
 ]
}