--- /dev/null
+{
+ "metadata": {
+ "name": "",
+ "signature": "sha256:285f7a82eaf5cc815e9a686ebce8aa2cfbdecb14f2473c9b5dfe0aedafcd727c"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+ {
+ "cells": [
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "from cipher import *\n",
+ "from cipherbreak import *\n",
+ "import math"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [],
+ "prompt_number": 79
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "def railfence_encipher(message, height, fillvalue=' '):\n",
+ " \"\"\"Railfence cipher\n",
+ "\n",
+ " >>> railfence_encipher('hellothereavastmeheartiesthisisalongpieceoftextfortestingrailfenceciphers', 2, fillvalue='!')\n",
+ " 'hlohraateerishsslnpeefetotsigaleccpeselteevsmhatetiiaogicotxfretnrifneihr!'\n",
+ " >>> railfence_encipher('hellothereavastmeheartiesthisisalongpieceoftextfortestingrailfenceciphers', 3, fillvalue='!')\n",
+ " 'horaersslpeeosglcpselteevsmhatetiiaogicotxfretnrifneihr!!lhateihsnefttiaece!'\n",
+ " >>> railfence_encipher('hellothereavastmeheartiesthisisalongpieceoftextfortestingrailfenceciphers', 5, fillvalue='!')\n",
+ " 'hresleogcseeemhetaocofrnrner!!lhateihsnefttiaece!!ltvsatiigitxetifih!!oarspeslp!'\n",
+ " >>> railfence_encipher('hellothereavastmeheartiesthisisalongpieceoftextfortestingrailfenceciphers', 10, fillvalue='!')\n",
+ " 'hepisehagitnr!!lernesge!!lmtocerh!!otiletap!!tseaorii!!hassfolc!!evtitffe!!rahsetec!!eixn!'\n",
+ " \"\"\"\n",
+ " sections = chunks(message, (height - 1) * 2, fillvalue=fillvalue)\n",
+ " # Add the top row\n",
+ " rows = [s[0] for s in sections]\n",
+ " # process the middle rows of the grid\n",
+ " for r in range(1, height - 1):\n",
+ " rows += [s[r] + s[-r] for s in sections]\n",
+ " # process the bottom row\n",
+ " rows += [s[height - 1] for s in sections]\n",
+ " return ''.join(rows)"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [],
+ "prompt_number": 2
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "pt = 'hellothereavastmeheartiesthisisalongpieceoftextfortestingrailfenceciphers'\n",
+ "height = 6"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [],
+ "prompt_number": 195
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "sections = chunks(pt, (height - 1) * 2, fillvalue='!')\n",
+ "n_sections = len(sections)\n",
+ "# Add the top row\n",
+ "rows = [' '.join([s[0] for s in sections])]\n",
+ "# process the middle rows of the grid\n",
+ "for r in range(1, height - 1):\n",
+ " # rows += [''.join([s[r:r+1] + s[n_sections-r:n_sections-r+1] for s in sections])]\n",
+ " rows += [''.join([s[r] + s[-r] for s in sections])]\n",
+ "# process the bottom row\n",
+ "# rows += [' '.join([s[height - 1:height] for s in sections])]\n",
+ "rows += [' '.join([s[height - 1] for s in sections])]\n",
+ "rows"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "metadata": {},
+ "output_type": "pyout",
+ "prompt_number": 196,
+ "text": [
+ "['h a r s e t l e',\n",
+ " 'eevatiacoreifhr!',\n",
+ " 'lraeislefosaeps!',\n",
+ " 'lesheioitftrni!!',\n",
+ " 'ohteshnpetigcc!!',\n",
+ " 't m t g x n e !']"
+ ]
+ }
+ ],
+ "prompt_number": 196
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "sections"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "metadata": {},
+ "output_type": "pyout",
+ "prompt_number": 197,
+ "text": [
+ "['hellothere',\n",
+ " 'avastmehea',\n",
+ " 'rtiesthisi',\n",
+ " 'salongpiec',\n",
+ " 'eoftextfor',\n",
+ " 'testingrai',\n",
+ " 'lfenceciph',\n",
+ " 'ers!!!!!!!']"
+ ]
+ }
+ ],
+ "prompt_number": 197
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "sections = chunks(pt, (height - 1) * 2, fillvalue='')\n",
+ "# Add the top row\n",
+ "rows = [' '.join([s[0] for s in sections])]\n",
+ "# process the middle rows of the grid\n",
+ "for r in range(1, height-1):\n",
+ " print(r, height*2-r-2, ':', sections[0][r:r+1], sections[0][height*2-r-2:height*2-r-1])\n",
+ " rows += [''.join([s[r:r+1] + s[height*2-r-2:height*2-r-1] for s in sections])]\n",
+ " # rows += [''.join([s[r] + s[-r] for s in sections])]\n",
+ "# process the bottom row\n",
+ "rows += [' '.join([s[height - 1:height] for s in sections])]\n",
+ "# rows += [' '.join([s[height - 1] for s in sections])]\n",
+ "rows"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "1 9 : e e\n",
+ "2 8 : l r\n",
+ "3 7 : l e\n",
+ "4 6 : o h\n"
+ ]
+ },
+ {
+ "metadata": {},
+ "output_type": "pyout",
+ "prompt_number": 198,
+ "text": [
+ "['h a r s e t l e',\n",
+ " 'eevatiacoreifhr',\n",
+ " 'lraeislefosaeps',\n",
+ " 'lesheioitftrni',\n",
+ " 'ohteshnpetigcc',\n",
+ " 't m t g x n e ']"
+ ]
+ }
+ ],
+ "prompt_number": 198
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "sections"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "metadata": {},
+ "output_type": "pyout",
+ "prompt_number": 199,
+ "text": [
+ "['hellothere',\n",
+ " 'avastmehea',\n",
+ " 'rtiesthisi',\n",
+ " 'salongpiec',\n",
+ " 'eoftextfor',\n",
+ " 'testingrai',\n",
+ " 'lfenceciph',\n",
+ " 'ers']"
+ ]
+ }
+ ],
+ "prompt_number": 199
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "ct = ''.join(c for c in ''.join(rows) if c != ' ')\n",
+ "ct"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "metadata": {},
+ "output_type": "pyout",
+ "prompt_number": 200,
+ "text": [
+ "'harsetleeevatiacoreifhrlraeislefosaepslesheioitftrniohteshnpetigcctmtgxne'"
+ ]
+ }
+ ],
+ "prompt_number": 200
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "n_sections = math.ceil(len(pt) / ((height - 1) * 2))\n",
+ "n_sections"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "metadata": {},
+ "output_type": "pyout",
+ "prompt_number": 202,
+ "text": [
+ "8"
+ ]
+ }
+ ],
+ "prompt_number": 202
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "padding_to_add = n_sections * (height - 1) * 2 - len(pt)\n",
+ "padding_to_add"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "metadata": {},
+ "output_type": "pyout",
+ "prompt_number": 203,
+ "text": [
+ "7"
+ ]
+ }
+ ],
+ "prompt_number": 203
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "row_lengths = [n_sections] * (height - 1) * 2\n",
+ "row_lengths"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "metadata": {},
+ "output_type": "pyout",
+ "prompt_number": 204,
+ "text": [
+ "[8, 8, 8, 8, 8, 8, 8, 8, 8, 8]"
+ ]
+ }
+ ],
+ "prompt_number": 204
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "for i in range((height - 1) * 2 - 1, (height - 1) * 2 - (padding_to_add + 1), -1):\n",
+ " row_lengths[i] -= 1\n",
+ "row_lengths"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "metadata": {},
+ "output_type": "pyout",
+ "prompt_number": 205,
+ "text": [
+ "[8, 8, 8, 7, 7, 7, 7, 7, 7, 7]"
+ ]
+ }
+ ],
+ "prompt_number": 205
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "folded_row_lengths = [row_lengths[0]]\n",
+ "for i in range(1, height-1):\n",
+ " folded_row_lengths += [row_lengths[i] + row_lengths[-i]]\n",
+ "folded_row_lengths += [row_lengths[height - 1]]\n",
+ "folded_row_lengths"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "metadata": {},
+ "output_type": "pyout",
+ "prompt_number": 206,
+ "text": [
+ "[8, 15, 15, 14, 14, 7]"
+ ]
+ }
+ ],
+ "prompt_number": 206
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "rows = []\n",
+ "row_start = 0\n",
+ "for i in folded_row_lengths:\n",
+ " rows += [ct[row_start:row_start + i]]\n",
+ " row_start += i\n",
+ "rows"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "metadata": {},
+ "output_type": "pyout",
+ "prompt_number": 207,
+ "text": [
+ "['harsetle',\n",
+ " 'eevatiacoreifhr',\n",
+ " 'lraeislefosaeps',\n",
+ " 'lesheioitftrni',\n",
+ " 'ohteshnpetigcc',\n",
+ " 'tmtgxne']"
+ ]
+ }
+ ],
+ "prompt_number": 207
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "down_rows = [rows[0]]\n",
+ "up_rows = []\n",
+ "for i in range(1, height-1):\n",
+ " down_rows += [''.join([c for n, c in enumerate(rows[i]) if n % 2 == 0])]\n",
+ " up_rows += [''.join([c for n, c in enumerate(rows[i]) if n % 2 == 1])]\n",
+ "down_rows += [rows[-1]]\n",
+ "down_rows, up_rows"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "metadata": {},
+ "output_type": "pyout",
+ "prompt_number": 208,
+ "text": [
+ "(['harsetle', 'evtaoefr', 'lailfses', 'lseottn', 'otsneic', 'tmtgxne'],\n",
+ " ['eaicrih', 'reseoap', 'ehiifri', 'hehptgc'])"
+ ]
+ }
+ ],
+ "prompt_number": 208
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "up_rows.reverse()\n",
+ "down_rows + up_rows"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "metadata": {},
+ "output_type": "pyout",
+ "prompt_number": 164,
+ "text": [
+ "['hresleogcs',\n",
+ " 'eehtoorre',\n",
+ " 'laehnftac',\n",
+ " 'lvaigteii',\n",
+ " 'oarspeslp',\n",
+ " 'tstiixtfh',\n",
+ " 'htisetiee',\n",
+ " 'emeacfnnr']"
+ ]
+ }
+ ],
+ "prompt_number": 164
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "''.join(c for r in zip_longest(*(down_rows + up_rows), fillvalue='') for c in r)"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "metadata": {},
+ "output_type": "pyout",
+ "prompt_number": 165,
+ "text": [
+ "'hellothereavastmeheartiesthisisalongpieceoftextfortestingrailfenceciphers'"
+ ]
+ }
+ ],
+ "prompt_number": 165
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "def rfe(message, height, fillvalue=''):\n",
+ " sections = chunks(message, (height - 1) * 2, fillvalue=fillvalue)\n",
+ " n_sections = len(sections)\n",
+ " # Add the top row\n",
+ " rows = [''.join([s[0] for s in sections])]\n",
+ " # process the middle rows of the grid\n",
+ " for r in range(1, height-1):\n",
+ " rows += [''.join([s[r:r+1] + s[height*2-r-2:height*2-r-1] for s in sections])]\n",
+ " # process the bottom row\n",
+ " rows += [''.join([s[height - 1:height] for s in sections])]\n",
+ " # rows += [' '.join([s[height - 1] for s in sections])]\n",
+ " return ''.join(rows)"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [],
+ "prompt_number": 171
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "rfe(pt, 5)"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "metadata": {},
+ "output_type": "pyout",
+ "prompt_number": 177,
+ "text": [
+ "'hresleogcseeemhetaocofrnrnerlhateihsnefttiaeceltvsatiigitxetifihoarspeslp'"
+ ]
+ }
+ ],
+ "prompt_number": 177
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "rfe(pt, 5) == ct"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "metadata": {},
+ "output_type": "pyout",
+ "prompt_number": 178,
+ "text": [
+ "True"
+ ]
+ }
+ ],
+ "prompt_number": 178
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "def rfd(message, height, fillvalue=''):\n",
+ " n_sections = math.ceil(len(message) / ((height - 1) * 2))\n",
+ " padding_to_add = n_sections * (height - 1) * 2 - len(message)\n",
+ " row_lengths = [n_sections] * (height - 1) * 2\n",
+ " for i in range((height - 1) * 2 - 1, (height - 1) * 2 - (padding_to_add + 1), -1):\n",
+ " row_lengths[i] -= 1\n",
+ " folded_row_lengths = [row_lengths[0]]\n",
+ " for i in range(1, height-1):\n",
+ " folded_row_lengths += [row_lengths[i] + row_lengths[-i]]\n",
+ " folded_row_lengths += [row_lengths[height - 1]]\n",
+ " rows = []\n",
+ " row_start = 0\n",
+ " for i in folded_row_lengths:\n",
+ " rows += [message[row_start:row_start + i]]\n",
+ " row_start += i\n",
+ " down_rows = [rows[0]]\n",
+ " up_rows = []\n",
+ " for i in range(1, height-1):\n",
+ " down_rows += [''.join([c for n, c in enumerate(rows[i]) if n % 2 == 0])]\n",
+ " up_rows += [''.join([c for n, c in enumerate(rows[i]) if n % 2 == 1])]\n",
+ " down_rows += [rows[-1]]\n",
+ " up_rows.reverse()\n",
+ " return ''.join(c for r in zip_longest(*(down_rows + up_rows), fillvalue='') for c in r)"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [],
+ "prompt_number": 220
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "h = 7\n",
+ "print(rfe(pt, h))\n",
+ "rfd(rfe(pt, h), h)"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "haspolsevsetgifrifrlatihnettaeelemtiocxernhorersleesgcptehaiaottneihesfic\n"
+ ]
+ },
+ {
+ "metadata": {},
+ "output_type": "pyout",
+ "prompt_number": 221,
+ "text": [
+ "'hellothereavastmeheartiesthisisalongpieceoftextfortestingrailfenceciphers'"
+ ]
+ }
+ ],
+ "prompt_number": 221
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "for h in range(2, 51):\n",
+ " assert rfd(rfe(pt, h), h) == pt\n",
+ " print(h, ':', rfd(rfe(pt, h), h) == pt)"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "2 : True\n",
+ "3 : True\n",
+ "4 : True\n",
+ "5 : True\n",
+ "6 : True\n",
+ "7 : True\n",
+ "8 : True\n",
+ "9 : True\n",
+ "10 : True\n",
+ "11 : True\n",
+ "12 : True\n",
+ "13 : True\n",
+ "14 : True\n",
+ "15 : True\n",
+ "16 : True\n",
+ "17 : True\n",
+ "18 : True\n",
+ "19 : True\n",
+ "20 : True\n",
+ "21 : True\n",
+ "22 : True\n",
+ "23 : True\n",
+ "24 : True\n",
+ "25 : True\n",
+ "26 : True\n",
+ "27 : True\n",
+ "28 : True\n",
+ "29 : True\n",
+ "30 : True\n",
+ "31 : True\n",
+ "32 : True\n",
+ "33 : True\n",
+ "34 : True\n",
+ "35 : True\n",
+ "36 : True\n",
+ "37 : True\n",
+ "38 : True\n",
+ "39 : True\n",
+ "40 : True\n",
+ "41 : True\n",
+ "42 : True\n",
+ "43 : True\n",
+ "44 : True\n",
+ "45 : True\n",
+ "46 : True\n",
+ "47 : True\n",
+ "48 : True\n",
+ "49 : True\n",
+ "50 : True\n"
+ ]
+ }
+ ],
+ "prompt_number": 227
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "h"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "metadata": {},
+ "output_type": "pyout",
+ "prompt_number": 224,
+ "text": [
+ "1"
+ ]
+ }
+ ],
+ "prompt_number": 224
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "rfe('hellotherefriends', 4)"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "metadata": {},
+ "output_type": "pyout",
+ "prompt_number": 228,
+ "text": [
+ "'hhieterelorfnsled'"
+ ]
+ }
+ ],
+ "prompt_number": 228
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "rfd('hhieterelorfnsled', 4)"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "metadata": {},
+ "output_type": "pyout",
+ "prompt_number": 229,
+ "text": [
+ "'hellotherefriends'"
+ ]
+ }
+ ],
+ "prompt_number": 229
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "for h in [3, 5, 7]:\n",
+ " print(rfe(pt, h))"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "horaersslpeeosglcpselteevsmhatetiiaogicotxfretnrifneihrlhateihsnefttiaece\n",
+ "hresleogcseeemhetaocofrnrnerlhateihsnefttiaeceltvsatiigitxetifihoarspeslp\n",
+ "haspolsevsetgifrifrlatihnettaeelemtiocxernhorersleesgcptehaiaottneihesfic\n"
+ ]
+ }
+ ],
+ "prompt_number": 230
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [],
+ "language": "python",
+ "metadata": {},
+ "outputs": []
+ }
+ ],
+ "metadata": {}
+ }
+ ]
+}
\ No newline at end of file
projects / cipher-tools.git / blobdiff