2020/2020-challenge7.ipynb

   1 {
   2  "cells": [
   3   {
   4    "cell_type": "code",
   5    "execution_count": 220,
   6    "metadata": {
   7     "Collapsed": "false"
   8    },
   9    "outputs": [],
  10    "source": [
  11     "from szyfrow.keyword_cipher import *\n",
  12     "from szyfrow.column_transposition import *\n",
  13     "from szyfrow.vigenere import *\n",
  14     "from szyfrow.support.text_prettify import *\n",
  15     "from szyfrow.polybius import *\n",
  16     "from szyfrow.caesar import *\n",
  17     "import collections\n",
  18     "from itertools import *"
  19    ]
  20   },
  21   {
  22    "cell_type": "code",
  23    "execution_count": 150,
  24    "metadata": {
  25     "Collapsed": "false"
  26    },
  27    "outputs": [],
  28    "source": [
  29     "challenge_number = 7\n",
  30     "plaintext_a_filename = f'plaintext.{challenge_number}a.txt'\n",
  31     "plaintext_b_filename = f'plaintext.{challenge_number}b.txt'\n",
  32     "ciphertext_a_filename = f'ciphertext.{challenge_number}a.txt'\n",
  33     "ciphertext_b_filename = f'ciphertext.{challenge_number}b.txt'"
  34    ]
  35   },
  36   {
  37    "cell_type": "code",
  38    "execution_count": 151,
  39    "metadata": {
  40     "Collapsed": "false"
  41    },
  42    "outputs": [],
  43    "source": [
  44     "ca = open(ciphertext_a_filename).read()\n",
  45     "sca = sanitise(ca)\n",
  46     "rsca = cat(reversed(sca))\n",
  47     "cb = open(ciphertext_b_filename).read()\n",
  48     "scb = cat(c for c in cb if c in (string.ascii_letters + '#+'))"
  49    ]
  50   },
  51   {
  52    "cell_type": "code",
  53    "execution_count": 6,
  54    "metadata": {
  55     "Collapsed": "false"
  56    },
  57    "outputs": [
  58     {
  59      "name": "stdout",
  60      "output_type": "stream",
  61      "text": [
  62       "triangle \n",
  63       "\n",
  64       "theattacheddocumentwasinterceptedbyharrysteamwhohavemanagedtoplantabugonthecommunicationlinesoutoftirpitzuferourcryptanalystshaveexaminedtheciphertextandthecasefilesandbelievethatitmayberelatedtothewheatstoneclockcipherdeputyheadofthedivisionhaswrittenabossguidetotheseciphermachinesandwehaveaddedthattothecasefilesharrysteamalsorecoveredascrapofburntpaperfromtheabwehrhqwastewhichcarriesthefollowingmessagewhichwethinkmightbepartoftheplaintexttentialstopthetripwireoptionisalsodeprecatedsinceitismorelikelythattheexplthenavyreportedthatadutchfishingvesselwasimpoundedbythenaziauthoritiesinbremerhaventhecrewweredetainedandnegotiationsareunderwaybetweenthedutchandgermanauthoritiestotrytogetthefishermenandtheirvesselbackbutinthemeantimernpatrolswillwatchoutfortheboatincaseitisinvolvedintheoperationtheairministryhavebeenbriefedonourfindingssofarandhaveemphasisedtheimportanceofprotectingtherdfsystemwhichiamtoldtheycallchainhomevkissympatheticbutthethreeofusarestillworriedaboutthenewagentsembeddedinlondonandwearenotsurehowmuchofathreattheyposeitiscrucialthatwebreaktheattachedciphertextasfastaspossiblesowecanputeffectivecountermeasuresinplaceitistemptingtoarrestalltwentythreespyclistsandaskthemdirectlybutwithoutrevealingtheextentofoursurveillanceandcodebreakingabilityitwillnotbepossibletoprovethattheyhavebrokenthelawsowewouldnotbeabletodetainordeportthemitwouldusuallybebettertowatchandwaitbuttheairministryfeelsthattherisktoourairdefenceistoogreatsoweneedtoactfastifweknewexactlywhenandwheretheyintendedtoattackchainhomethenwemightbeabletoincreasesecuritytopreventitbutagainweriskrevealingourcounterintelligencecapabilitiesharrysuggestedthatwecouldobscureourtracksbyfakingavisitbydignitariestothetargetsitesasacoverstoryforincreasedsecuritybutwecantmaintaintheincreaseforlongwithoutraisingsuspicionsoitiscrucialtodeterminetheirplanswhatevertheabwehrareintendingtheywontwanttheiragentstofallintoourhandsespeciallyafterademolitionsincethatwouldgiveustheexcuseweneedtoarrestthemitwouldbegoodtoknowwhattheyhaveinmindfortheirexfiltrationthingsareveryfinelybalancedifweacttoosoonwegiveawayourcrucialadvantageintheinterceptwarifweacttoolateourenemiescouldseriouslydamageourairdefencecapabilityitisclearthatthingsarecomingtoaheadanditiscrucialthatwecracktheclockcipherassoonaspossiblethefateofthecountryliesinyourhandspearl\n"
  65      ]
  66     }
  67    ],
  68    "source": [
  69     "key_a, score_a = vigenere_frequency_break(sca, fitness=Ptrigrams)\n",
  70     "print(key_a, '\\n')\n",
  71     "pa = vigenere_decipher(sca, key_a)\n",
  72     "print(pa)"
  73    ]
  74   },
  75   {
  76    "cell_type": "code",
  77    "execution_count": 7,
  78    "metadata": {
  79     "Collapsed": "false"
  80    },
  81    "outputs": [
  82     {
  83      "name": "stdout",
  84      "output_type": "stream",
  85      "text": [
  86       "the attached document was intercepted by harry steam who have managed to plant a bug on the\n",
  87       "communication lines out of tirpitz ufer our crypt analysts have examined the ciphertext and the case\n",
  88       "files and believe that it maybe related to the wheatstone clock cipher deputy head of the division\n",
  89       "has written a boss guide to these cipher machines and we have added that to the case files harry\n",
  90       "steam also recovered a scrap of burnt paper from the abwehr hq waste which carries the following\n",
  91       "message which we think might be part of the plaintext tential stop the tripwire option is also\n",
  92       "deprecated since it is more likely that the expl the navy reported that a dutch fishing vessel was\n",
  93       "impounded by the nazi authorities in bremerhaven the crew were detained and negotiations are\n",
  94       "underway between the dutch and german authorities to try to get the fishermen and their vessel back\n",
  95       "but in the meantime rn patrols will watch out for the boat in case it is involved in the operation\n",
  96       "the air ministry have been briefed on our findings so far and have emphasised the importance of\n",
  97       "protecting the rdf system which i am told they call chain home vk is sympathetic but the three of us\n",
  98       "are still worried about the new agents embedded in london and we are not sure how much of a threat\n",
  99       "they pose it is crucial that we break the attached ciphertext as fast as possible so we can put\n",
 100       "effective countermeasures in place it is tempting to arrest all twenty three spy c lists and ask\n",
 101       "them directly but without revealing the extent of our surveillance and code breaking ability it will\n",
 102       "not be possible to prove that they have broken the law so we would not be able to detain or deport\n",
 103       "them it would usually be better to watch and wait but the air ministry feels that the risk to our\n",
 104       "air defence is too great so we need to act fast if we knew exactly when and where they intended to\n",
 105       "attack chain home then we might be able to increase security to prevent it but again we risk\n",
 106       "revealing our counterintelligence capabilities harry suggested that we could obscure our tracks by\n",
 107       "faking a visit by dignitaries to the target sites as a coverstory for increased security but we cant\n",
 108       "maintain the increase for long without raising suspicion so it is crucial to determine their plans\n",
 109       "whatever the abwehr are intending they wont want their agents to fall into our hands especially\n",
 110       "after a demolition since that would give us the excuse we need to arrest them it would be good to\n",
 111       "know what they have in mind for their exfiltration things are very finely balanced if we act too\n",
 112       "soon we giveaway our crucial advantage in the intercept war if we act too late our enemies could\n",
 113       "seriously damage our air defence capability it is clear that things are coming to ahead and it is\n",
 114       "crucial that we crack the clock cipher as soon as possible the fate of the country lies in your\n",
 115       "hands pearl\n"
 116      ]
 117     }
 118    ],
 119    "source": [
 120     "pa = prettify(vigenere_decipher(sca, key_a))\n",
 121     "print(pa)"
 122    ]
 123   },
 124   {
 125    "cell_type": "code",
 126    "execution_count": 236,
 127    "metadata": {
 128     "Collapsed": "false"
 129    },
 130    "outputs": [
 131     {
 132      "data": {
 133       "text/plain": [
 134        "2843"
 135       ]
 136      },
 137      "execution_count": 236,
 138      "metadata": {},
 139      "output_type": "execute_result"
 140     }
 141    ],
 142    "source": [
 143     "open(plaintext_a_filename, 'w').write(pa)"
 144    ]
 145   },
 146   {
 147    "cell_type": "code",
 148    "execution_count": 152,
 149    "metadata": {
 150     "Collapsed": "false"
 151    },
 152    "outputs": [
 153     {
 154      "data": {
 155       "text/plain": [
 156        "'tentialstopthetripwireoptionisalsodeprecatedsinceitismorelikelythattheexpl'"
 157       ]
 158      },
 159      "execution_count": 152,
 160      "metadata": {},
 161      "output_type": "execute_result"
 162     }
 163    ],
 164    "source": [
 165     "crib = sanitise(\"tential stop the tripwire option is also deprecated since it is more likely that the expl\")\n",
 166     "crib"
 167    ]
 168   },
 169   {
 170    "cell_type": "code",
 171    "execution_count": 153,
 172    "metadata": {
 173     "Collapsed": "false"
 174    },
 175    "outputs": [
 176     {
 177      "data": {
 178       "text/plain": [
 179        "'#+ABCDEFGHIJKLMNOPQRSTUVWXYZ'"
 180       ]
 181      },
 182      "execution_count": 153,
 183      "metadata": {},
 184      "output_type": "execute_result"
 185     }
 186    ],
 187    "source": [
 188     "cat(sorted(set(scb)))"
 189    ]
 190   },
 191   {
 192    "cell_type": "code",
 193    "execution_count": 192,
 194    "metadata": {
 195     "Collapsed": "false"
 196    },
 197    "outputs": [],
 198    "source": [
 199     "p_alpha = string.ascii_lowercase\n",
 200     "c_alpha = string.ascii_uppercase + '#+'"
 201    ]
 202   },
 203   {
 204    "cell_type": "code",
 205    "execution_count": 193,
 206    "metadata": {
 207     "Collapsed": "false"
 208    },
 209    "outputs": [],
 210    "source": [
 211     "cipherstream = zip(cycle(p_alpha), cycle(c_alpha))"
 212    ]
 213   },
 214   {
 215    "cell_type": "code",
 216    "execution_count": 197,
 217    "metadata": {
 218     "Collapsed": "false"
 219    },
 220    "outputs": [],
 221    "source": [
 222     "def decipher_letter(cipher_letter, stream):\n",
 223     "    stream = dropwhile(lambda p: p[1] != cipher_letter, stream)\n",
 224     "    stream, temp_stream = tee(stream, 2)\n",
 225     "    (plain_letter, c) = list(islice(temp_stream, 1))[0]\n",
 226     "    return (plain_letter, islice(stream, 1, None))"
 227    ]
 228   },
 229   {
 230    "cell_type": "code",
 231    "execution_count": 198,
 232    "metadata": {
 233     "Collapsed": "false"
 234    },
 235    "outputs": [],
 236    "source": [
 237     "def encipher_letter(plain_letter, stream):\n",
 238     "    stream = dropwhile(lambda p: p[0] != plain_letter, stream)\n",
 239     "    stream, temp_stream = tee(stream, 2)\n",
 240     "    (p, cipher_letter) = list(islice(temp_stream, 1))[0]\n",
 241     "    return (cipher_letter, islice(stream, 1, None))"
 242    ]
 243   },
 244   {
 245    "cell_type": "code",
 246    "execution_count": 199,
 247    "metadata": {
 248     "Collapsed": "false"
 249    },
 250    "outputs": [
 251     {
 252      "data": {
 253       "text/plain": [
 254        "('b', 'd', 'z', 'b', 'd', 'f', 'h')"
 255       ]
 256      },
 257      "execution_count": 199,
 258      "metadata": {},
 259      "output_type": "execute_result"
 260     }
 261    ],
 262    "source": [
 263     "cipherstream = zip(cycle(p_alpha), cycle(c_alpha))\n",
 264     "p1, s1 = decipher_letter('B', cipherstream)\n",
 265     "p2, s2 = decipher_letter('D', s1)\n",
 266     "p3, s3 = decipher_letter('Z', s2)\n",
 267     "p4, s4 = decipher_letter('+', s3)\n",
 268     "p5, s5 = decipher_letter('B', s4)\n",
 269     "p6, s6 = decipher_letter('D', s5)\n",
 270     "p7, s7 = decipher_letter('D', s6)\n",
 271     "\n",
 272     "p1, p2, p3, p4, p5, p6, p7"
 273    ]
 274   },
 275   {
 276    "cell_type": "code",
 277    "execution_count": 200,
 278    "metadata": {
 279     "Collapsed": "false"
 280    },
 281    "outputs": [
 282     {
 283      "data": {
 284       "text/plain": [
 285        "('b', 'd')"
 286       ]
 287      },
 288      "execution_count": 200,
 289      "metadata": {},
 290      "output_type": "execute_result"
 291     }
 292    ],
 293    "source": [
 294     "cipherstream = zip(cycle(p_alpha), cycle(c_alpha))\n",
 295     "p1, s1 = decipher_letter('B', cipherstream)\n",
 296     "p2, s2 = decipher_letter('B', s1)\n",
 297     "\n",
 298     "p1, p2"
 299    ]
 300   },
 301   {
 302    "cell_type": "code",
 303    "execution_count": 201,
 304    "metadata": {
 305     "Collapsed": "false"
 306    },
 307    "outputs": [],
 308    "source": [
 309     "def decipher_message(ciphertext, stream):\n",
 310     "    plaintext = ''\n",
 311     "    for l in ciphertext:\n",
 312     "        p, stream = decipher_letter(l, stream)\n",
 313     "        plaintext += p\n",
 314     "    return plaintext, stream    "
 315    ]
 316   },
 317   {
 318    "cell_type": "code",
 319    "execution_count": 202,
 320    "metadata": {
 321     "Collapsed": "false"
 322    },
 323    "outputs": [],
 324    "source": [
 325     "def encipher_message(plaintext, stream):\n",
 326     "    ciphertext = ''\n",
 327     "    for l in plaintext:\n",
 328     "        c, stream = encipher_letter(l, stream)\n",
 329     "        ciphertext += c\n",
 330     "    return ciphertext, stream    "
 331    ]
 332   },
 333   {
 334    "cell_type": "code",
 335    "execution_count": 203,
 336    "metadata": {
 337     "Collapsed": "false"
 338    },
 339    "outputs": [
 340     {
 341      "data": {
 342       "text/plain": [
 343        "'vxnozddfahharfgoxiyg'"
 344       ]
 345      },
 346      "execution_count": 203,
 347      "metadata": {},
 348      "output_type": "execute_result"
 349     }
 350    ],
 351    "source": [
 352     "cipherstream = zip(cycle(p_alpha), cycle(c_alpha))\n",
 353     "pb, s = decipher_message(scb[:20], cipherstream)\n",
 354     "pb"
 355    ]
 356   },
 357   {
 358    "cell_type": "code",
 359    "execution_count": 204,
 360    "metadata": {
 361     "Collapsed": "false"
 362    },
 363    "outputs": [
 364     {
 365      "data": {
 366       "text/plain": [
 367        "'TCLREWFMNGHLZUHDU+GS+MWX+OURKUALSM+ALN#WSJUREUZMOSBQ#SUXIPKMELYRDWNLZUSJ+V'"
 368       ]
 369      },
 370      "execution_count": 204,
 371      "metadata": {},
 372      "output_type": "execute_result"
 373     }
 374    ],
 375    "source": [
 376     "cipherstream = zip(cycle(p_alpha), cycle(c_alpha))\n",
 377     "c_gen, s = encipher_message(crib, cipherstream)\n",
 378     "c_gen"
 379    ]
 380   },
 381   {
 382    "cell_type": "code",
 383    "execution_count": 205,
 384    "metadata": {
 385     "Collapsed": "false",
 386     "scrolled": true
 387    },
 388    "outputs": [
 389     {
 390      "data": {
 391       "text/plain": [
 392        "[(19, 'T'),\n",
 393        " (2, 'C'),\n",
 394        " (11, 'L'),\n",
 395        " (17, 'R'),\n",
 396        " (4, 'E'),\n",
 397        " (22, 'W'),\n",
 398        " (5, 'F'),\n",
 399        " (12, 'M'),\n",
 400        " (13, 'N'),\n",
 401        " (6, 'G'),\n",
 402        " (7, 'H'),\n",
 403        " (11, 'L'),\n",
 404        " (25, 'Z'),\n",
 405        " (20, 'U'),\n",
 406        " (7, 'H'),\n",
 407        " (3, 'D'),\n",
 408        " (20, 'U'),\n",
 409        " (27, '+'),\n",
 410        " (6, 'G'),\n",
 411        " (18, 'S'),\n",
 412        " (27, '+'),\n",
 413        " (12, 'M'),\n",
 414        " (22, 'W'),\n",
 415        " (23, 'X'),\n",
 416        " (27, '+'),\n",
 417        " (14, 'O'),\n",
 418        " (20, 'U'),\n",
 419        " (17, 'R'),\n",
 420        " (10, 'K'),\n",
 421        " (20, 'U'),\n",
 422        " (0, 'A'),\n",
 423        " (11, 'L'),\n",
 424        " (18, 'S'),\n",
 425        " (12, 'M'),\n",
 426        " (27, '+'),\n",
 427        " (0, 'A'),\n",
 428        " (11, 'L'),\n",
 429        " (13, 'N'),\n",
 430        " (26, '#'),\n",
 431        " (22, 'W'),\n",
 432        " (18, 'S'),\n",
 433        " (9, 'J'),\n",
 434        " (20, 'U'),\n",
 435        " (17, 'R'),\n",
 436        " (4, 'E'),\n",
 437        " (20, 'U'),\n",
 438        " (25, 'Z'),\n",
 439        " (12, 'M'),\n",
 440        " (14, 'O'),\n",
 441        " (18, 'S'),\n",
 442        " (1, 'B'),\n",
 443        " (16, 'Q'),\n",
 444        " (26, '#'),\n",
 445        " (18, 'S'),\n",
 446        " (20, 'U'),\n",
 447        " (23, 'X'),\n",
 448        " (8, 'I'),\n",
 449        " (15, 'P'),\n",
 450        " (10, 'K'),\n",
 451        " (12, 'M'),\n",
 452        " (4, 'E'),\n",
 453        " (11, 'L'),\n",
 454        " (24, 'Y'),\n",
 455        " (17, 'R'),\n",
 456        " (3, 'D'),\n",
 457        " (22, 'W'),\n",
 458        " (13, 'N'),\n",
 459        " (11, 'L'),\n",
 460        " (25, 'Z'),\n",
 461        " (20, 'U'),\n",
 462        " (18, 'S'),\n",
 463        " (9, 'J'),\n",
 464        " (27, '+'),\n",
 465        " (21, 'V')]"
 466       ]
 467      },
 468      "execution_count": 205,
 469      "metadata": {},
 470      "output_type": "execute_result"
 471     }
 472    ],
 473    "source": [
 474     "co = [(c_alpha.find(l), l) for i, l in enumerate(c_gen)]\n",
 475     "co"
 476    ]
 477   },
 478   {
 479    "cell_type": "code",
 480    "execution_count": 206,
 481    "metadata": {
 482     "Collapsed": "false"
 483    },
 484    "outputs": [
 485     {
 486      "data": {
 487       "text/plain": [
 488        "'VXLKVZXZSZXODRQYFQEM'"
 489       ]
 490      },
 491      "execution_count": 206,
 492      "metadata": {},
 493      "output_type": "execute_result"
 494     }
 495    ],
 496    "source": [
 497     "scb[:20]"
 498    ]
 499   },
 500   {
 501    "cell_type": "code",
 502    "execution_count": 207,
 503    "metadata": {
 504     "Collapsed": "false"
 505    },
 506    "outputs": [],
 507    "source": [
 508     "def offsets(ciphertext):\n",
 509     "    mappings = {}\n",
 510     "    letters_seen = 0\n",
 511     "    offsets = []\n",
 512     "    for l in ciphertext:\n",
 513     "        if l not in mappings:\n",
 514     "            mappings[l] = letters_seen\n",
 515     "            letters_seen += 1\n",
 516     "        offsets.append(mappings[l])\n",
 517     "    return offsets"
 518    ]
 519   },
 520   {
 521    "cell_type": "code",
 522    "execution_count": 208,
 523    "metadata": {
 524     "Collapsed": "false"
 525    },
 526    "outputs": [
 527     {
 528      "data": {
 529       "text/plain": [
 530        "74"
 531       ]
 532      },
 533      "execution_count": 208,
 534      "metadata": {},
 535      "output_type": "execute_result"
 536     }
 537    ],
 538    "source": [
 539     "crib_offsets = offsets(c_gen)\n",
 540     "len(crib_offsets)"
 541    ]
 542   },
 543   {
 544    "cell_type": "code",
 545    "execution_count": 209,
 546    "metadata": {
 547     "Collapsed": "false"
 548    },
 549    "outputs": [],
 550    "source": [
 551     "def plausible_samples(generated_text):\n",
 552     "    plausible_samples = {}\n",
 553     "    for i in range(len(scb)):\n",
 554     "        sample = scb[i:(i + len(crib))]\n",
 555     "        if len(sample) == len(crib):\n",
 556     "            ofs = offsets(sample)\n",
 557     "            if ofs == crib_offsets:\n",
 558     "                plausible_samples[i] = sample\n",
 559     "    return plausible_samples"
 560    ]
 561   },
 562   {
 563    "cell_type": "code",
 564    "execution_count": 210,
 565    "metadata": {
 566     "Collapsed": "false"
 567    },
 568    "outputs": [
 569     {
 570      "data": {
 571       "text/plain": [
 572        "'TCLREWFMNGHLZUHDU+GS+MWX+OURKUALSM+ALN#WSJUREUZMOSBQ#SUXIPKMELYRDWNLZUSJ+V'"
 573       ]
 574      },
 575      "execution_count": 210,
 576      "metadata": {},
 577      "output_type": "execute_result"
 578     }
 579    ],
 580    "source": [
 581     "c_gen"
 582    ]
 583   },
 584   {
 585    "cell_type": "code",
 586    "execution_count": 211,
 587    "metadata": {
 588     "Collapsed": "false"
 589    },
 590    "outputs": [],
 591    "source": [
 592     "def plausible_mapping(crib_output):\n",
 593     "    mapping = {}\n",
 594     "    for n, l in crib_output:\n",
 595     "        if n in mapping:\n",
 596     "            if mapping[n] != l:\n",
 597     "                return {}\n",
 598     "        else:\n",
 599     "            mapping[n] = l\n",
 600     "    return mapping"
 601    ]
 602   },
 603   {
 604    "cell_type": "code",
 605    "execution_count": null,
 606    "metadata": {
 607     "Collapsed": "false"
 608    },
 609    "outputs": [],
 610    "source": []
 611   },
 612   {
 613    "cell_type": "code",
 614    "execution_count": 212,
 615    "metadata": {
 616     "Collapsed": "false"
 617    },
 618    "outputs": [
 619     {
 620      "data": {
 621       "text/plain": [
 622        "{19: 'T', 2: 'C', 11: 'L'}"
 623       ]
 624      },
 625      "execution_count": 212,
 626      "metadata": {},
 627      "output_type": "execute_result"
 628     }
 629    ],
 630    "source": [
 631     "plausible_mapping(co[:3])"
 632    ]
 633   },
 634   {
 635    "cell_type": "code",
 636    "execution_count": 213,
 637    "metadata": {
 638     "Collapsed": "false"
 639    },
 640    "outputs": [
 641     {
 642      "data": {
 643       "text/plain": [
 644        "{0: {1026: 'KW+ASVCNDJM+BPM#PLJHLNVZLUPAXPR+HNLR+DIVHGPASPBNUHFOIHPZTYXNS+QA#VD+BPHGLE'},\n",
 645        " 1: {1026: 'KW+ASVCNDJM+BPM#PLJHLNVZLUPAXPR+HNLR+DIVHGPASPBNUHFOIHPZTYXNS+QA#VD+BPHGLE'},\n",
 646        " 2: {1026: 'KW+ASVCNDJM+BPM#PLJHLNVZLUPAXPR+HNLR+DIVHGPASPBNUHFOIHPZTYXNS+QA#VD+BPHGLE'},\n",
 647        " 3: {1026: 'KW+ASVCNDJM+BPM#PLJHLNVZLUPAXPR+HNLR+DIVHGPASPBNUHFOIHPZTYXNS+QA#VD+BPHGLE'},\n",
 648        " 4: {1026: 'KW+ASVCNDJM+BPM#PLJHLNVZLUPAXPR+HNLR+DIVHGPASPBNUHFOIHPZTYXNS+QA#VD+BPHGLE'},\n",
 649        " 5: {1026: 'KW+ASVCNDJM+BPM#PLJHLNVZLUPAXPR+HNLR+DIVHGPASPBNUHFOIHPZTYXNS+QA#VD+BPHGLE'},\n",
 650        " 6: {1026: 'KW+ASVCNDJM+BPM#PLJHLNVZLUPAXPR+HNLR+DIVHGPASPBNUHFOIHPZTYXNS+QA#VD+BPHGLE'},\n",
 651        " 7: {1026: 'KW+ASVCNDJM+BPM#PLJHLNVZLUPAXPR+HNLR+DIVHGPASPBNUHFOIHPZTYXNS+QA#VD+BPHGLE'},\n",
 652        " 8: {1026: 'KW+ASVCNDJM+BPM#PLJHLNVZLUPAXPR+HNLR+DIVHGPASPBNUHFOIHPZTYXNS+QA#VD+BPHGLE'},\n",
 653        " 9: {1026: 'KW+ASVCNDJM+BPM#PLJHLNVZLUPAXPR+HNLR+DIVHGPASPBNUHFOIHPZTYXNS+QA#VD+BPHGLE'},\n",
 654        " 10: {1026: 'KW+ASVCNDJM+BPM#PLJHLNVZLUPAXPR+HNLR+DIVHGPASPBNUHFOIHPZTYXNS+QA#VD+BPHGLE'},\n",
 655        " 11: {1026: 'KW+ASVCNDJM+BPM#PLJHLNVZLUPAXPR+HNLR+DIVHGPASPBNUHFOIHPZTYXNS+QA#VD+BPHGLE'},\n",
 656        " 12: {1026: 'KW+ASVCNDJM+BPM#PLJHLNVZLUPAXPR+HNLR+DIVHGPASPBNUHFOIHPZTYXNS+QA#VD+BPHGLE'},\n",
 657        " 13: {1026: 'KW+ASVCNDJM+BPM#PLJHLNVZLUPAXPR+HNLR+DIVHGPASPBNUHFOIHPZTYXNS+QA#VD+BPHGLE'},\n",
 658        " 14: {1026: 'KW+ASVCNDJM+BPM#PLJHLNVZLUPAXPR+HNLR+DIVHGPASPBNUHFOIHPZTYXNS+QA#VD+BPHGLE'},\n",
 659        " 15: {1026: 'KW+ASVCNDJM+BPM#PLJHLNVZLUPAXPR+HNLR+DIVHGPASPBNUHFOIHPZTYXNS+QA#VD+BPHGLE'},\n",
 660        " 16: {1026: 'KW+ASVCNDJM+BPM#PLJHLNVZLUPAXPR+HNLR+DIVHGPASPBNUHFOIHPZTYXNS+QA#VD+BPHGLE'},\n",
 661        " 17: {1026: 'KW+ASVCNDJM+BPM#PLJHLNVZLUPAXPR+HNLR+DIVHGPASPBNUHFOIHPZTYXNS+QA#VD+BPHGLE'},\n",
 662        " 18: {1026: 'KW+ASVCNDJM+BPM#PLJHLNVZLUPAXPR+HNLR+DIVHGPASPBNUHFOIHPZTYXNS+QA#VD+BPHGLE'},\n",
 663        " 19: {1026: 'KW+ASVCNDJM+BPM#PLJHLNVZLUPAXPR+HNLR+DIVHGPASPBNUHFOIHPZTYXNS+QA#VD+BPHGLE'},\n",
 664        " 20: {1026: 'KW+ASVCNDJM+BPM#PLJHLNVZLUPAXPR+HNLR+DIVHGPASPBNUHFOIHPZTYXNS+QA#VD+BPHGLE'},\n",
 665        " 21: {1026: 'KW+ASVCNDJM+BPM#PLJHLNVZLUPAXPR+HNLR+DIVHGPASPBNUHFOIHPZTYXNS+QA#VD+BPHGLE'},\n",
 666        " 22: {1026: 'KW+ASVCNDJM+BPM#PLJHLNVZLUPAXPR+HNLR+DIVHGPASPBNUHFOIHPZTYXNS+QA#VD+BPHGLE'},\n",
 667        " 23: {1026: 'KW+ASVCNDJM+BPM#PLJHLNVZLUPAXPR+HNLR+DIVHGPASPBNUHFOIHPZTYXNS+QA#VD+BPHGLE'},\n",
 668        " 24: {1026: 'KW+ASVCNDJM+BPM#PLJHLNVZLUPAXPR+HNLR+DIVHGPASPBNUHFOIHPZTYXNS+QA#VD+BPHGLE'},\n",
 669        " 25: {1026: 'KW+ASVCNDJM+BPM#PLJHLNVZLUPAXPR+HNLR+DIVHGPASPBNUHFOIHPZTYXNS+QA#VD+BPHGLE'}}"
 670       ]
 671      },
 672      "execution_count": 213,
 673      "metadata": {},
 674      "output_type": "execute_result"
 675     }
 676    ],
 677    "source": [
 678     "solutions = {}\n",
 679     "for i in range(26):\n",
 680     "    cipherstream = zip(islice(cycle(p_alpha), i, None),\n",
 681     "                       cycle(c_alpha))\n",
 682     "    c_gen, s = encipher_message(crib, cipherstream)\n",
 683     "    solutions[i] = plausible_samples(c_gen)\n",
 684     "solutions"
 685    ]
 686   },
 687   {
 688    "cell_type": "code",
 689    "execution_count": 225,
 690    "metadata": {
 691     "Collapsed": "false"
 692    },
 693    "outputs": [
 694     {
 695      "data": {
 696       "text/plain": [
 697        "12"
 698       ]
 699      },
 700      "execution_count": 225,
 701      "metadata": {},
 702      "output_type": "execute_result"
 703     }
 704    ],
 705    "source": [
 706     "1026 % 26"
 707    ]
 708   },
 709   {
 710    "cell_type": "code",
 711    "execution_count": 214,
 712    "metadata": {
 713     "Collapsed": "false"
 714    },
 715    "outputs": [
 716     {
 717      "data": {
 718       "text/plain": [
 719        "'TCLREWFMNGHLZUHDU+GS+MWX+OURKUALSM+ALN#WSJUREUZMOSBQ#SUXIPKMELYRDWNLZUSJ+V'"
 720       ]
 721      },
 722      "execution_count": 214,
 723      "metadata": {},
 724      "output_type": "execute_result"
 725     }
 726    ],
 727    "source": [
 728     "cipherstream = zip(cycle(p_alpha), cycle(c_alpha))\n",
 729     "c_gen0, s = encipher_message(crib, cipherstream)\n",
 730     "c_gen0"
 731    ]
 732   },
 733   {
 734    "cell_type": "code",
 735    "execution_count": 215,
 736    "metadata": {
 737     "Collapsed": "false"
 738    },
 739    "outputs": [
 740     {
 741      "data": {
 742       "text/plain": [
 743        "'ABCDEFGHIJKLMNOPQRSTUVWXYZ#+'"
 744       ]
 745      },
 746      "execution_count": 215,
 747      "metadata": {},
 748      "output_type": "execute_result"
 749     }
 750    ],
 751    "source": [
 752     "c_alpha"
 753    ]
 754   },
 755   {
 756    "cell_type": "code",
 757    "execution_count": 216,
 758    "metadata": {
 759     "Collapsed": "false"
 760    },
 761    "outputs": [
 762     {
 763      "data": {
 764       "text/plain": [
 765        "{19: 'K',\n",
 766        " 2: 'W',\n",
 767        " 11: '+',\n",
 768        " 17: 'A',\n",
 769        " 4: 'S',\n",
 770        " 22: 'V',\n",
 771        " 5: 'C',\n",
 772        " 12: 'N',\n",
 773        " 13: 'D',\n",
 774        " 6: 'J',\n",
 775        " 7: 'M',\n",
 776        " 25: 'B',\n",
 777        " 20: 'P',\n",
 778        " 3: '#',\n",
 779        " 27: 'L',\n",
 780        " 18: 'H',\n",
 781        " 23: 'Z',\n",
 782        " 14: 'U',\n",
 783        " 10: 'X',\n",
 784        " 0: 'R',\n",
 785        " 26: 'I',\n",
 786        " 9: 'G',\n",
 787        " 1: 'F',\n",
 788        " 16: 'O',\n",
 789        " 8: 'T',\n",
 790        " 15: 'Y',\n",
 791        " 24: 'Q',\n",
 792        " 21: 'E'}"
 793       ]
 794      },
 795      "execution_count": 216,
 796      "metadata": {},
 797      "output_type": "execute_result"
 798     }
 799    ],
 800    "source": [
 801     "soln = solutions[0][1026]\n",
 802     "alpha_pos = [c_alpha.find(c) for c in c_gen0]\n",
 803     "c_alpha_mapped = {}\n",
 804     "\n",
 805     "for p, c in zip(alpha_pos, soln):\n",
 806     "    c_alpha_mapped[p] = c\n",
 807     "c_alpha_mapped"
 808    ]
 809   },
 810   {
 811    "cell_type": "code",
 812    "execution_count": 217,
 813    "metadata": {
 814     "Collapsed": "false"
 815    },
 816    "outputs": [
 817     {
 818      "data": {
 819       "text/plain": [
 820        "'RFW#SCJMTGX+NDUYOAHKPEVZQBIL'"
 821       ]
 822      },
 823      "execution_count": 217,
 824      "metadata": {},
 825      "output_type": "execute_result"
 826     }
 827    ],
 828    "source": [
 829     "discovered_c_alpha = cat(c_alpha_mapped[i] if i in c_alpha_mapped else ' ' for i in range(28))\n",
 830     "discovered_c_alpha"
 831    ]
 832   },
 833   {
 834    "cell_type": "code",
 835    "execution_count": 218,
 836    "metadata": {
 837     "Collapsed": "false"
 838    },
 839    "outputs": [
 840     {
 841      "data": {
 842       "text/plain": [
 843        "28"
 844       ]
 845      },
 846      "execution_count": 218,
 847      "metadata": {},
 848      "output_type": "execute_result"
 849     }
 850    ],
 851    "source": [
 852     "len(c_alpha_mapped)"
 853    ]
 854   },
 855   {
 856    "cell_type": "code",
 857    "execution_count": 226,
 858    "metadata": {
 859     "Collapsed": "false"
 860    },
 861    "outputs": [
 862     {
 863      "data": {
 864       "text/plain": [
 865        "'NDUYOAHKPEVZQBILRFW#SCJMTGX+'"
 866       ]
 867      },
 868      "execution_count": 226,
 869      "metadata": {},
 870      "output_type": "execute_result"
 871     }
 872    ],
 873    "source": [
 874     "rotated_c_alpha = discovered_c_alpha[12:] + discovered_c_alpha[:12]\n",
 875     "rotated_c_alpha"
 876    ]
 877   },
 878   {
 879    "cell_type": "code",
 880    "execution_count": 219,
 881    "metadata": {
 882     "Collapsed": "false"
 883    },
 884    "outputs": [
 885     {
 886      "data": {
 887       "text/plain": [
 888        "'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'"
 889       ]
 890      },
 891      "execution_count": 219,
 892      "metadata": {},
 893      "output_type": "execute_result"
 894     }
 895    ],
 896    "source": [
 897     "cipherstream = zip(cycle(p_alpha), cycle(discovered_c_alpha))\n",
 898     "c_gen, s = decipher_message(scb, cipherstream)\n",
 899     "c_gen"
 900    ]
 901   },
 902   {
 903    "cell_type": "code",
 904    "execution_count": 221,
 905    "metadata": {
 906     "Collapsed": "false"
 907    },
 908    "outputs": [
 909     {
 910      "data": {
 911       "text/plain": [
 912        "(12, -7510.337448308099)"
 913       ]
 914      },
 915      "execution_count": 221,
 916      "metadata": {},
 917      "output_type": "execute_result"
 918     }
 919    ],
 920    "source": [
 921     "caesar_break(c_gen)"
 922    ]
 923   },
 924   {
 925    "cell_type": "code",
 926    "execution_count": 222,
 927    "metadata": {
 928     "Collapsed": "false"
 929    },
 930    "outputs": [
 931     {
 932      "data": {
 933       "text/plain": [
 934        "'karloperationcathedraltowerhasbeenapprovedandouragentsarearrangingtoprovideyouwiththetntyourequestedinyourlastmessagestopthiswillbeshippedonadutchfishingvesselwhichwilllandatthemarshesoffoldleighattwoamonfridaydecembertenthstoptheywillsignaltheirarrivalbyflashingtheirnavigationlightsinmorsecodetospelloutthewordflatandyouwillreplytyrestopifyoubelievethatyouarebeingwatchedthenabandontherendezvousandtryagainatintervalsoftwodaysthreedaysfivedaysandsevendaysstopdonotattempttomakecontactwiththeboatoritscrewinanyotherwaystoptheexplosiveisstablebutshouldbetreatedwithcarestopthefusesarethemostrecentproductofourresearchandtechnologydivisionandcarrytripletriggersstoptheyhaveatimercircuitwhichmaybesetforanyperiodfromthreeminutestoseventeenhoursstoptheycanalsobetriggeredbyatripwireassemblyorthefusemechanismcanbereplacedwithahandgrenademechanismstopsincethesechargeshavebeenshapedfordemolitionusewedonotrecommendusingthesedevicesincombatsinceyouhavenocertaintythatthechargewilllandinanorientationthatwillmaximiseitsdestructivepotentialstopthetripwireoptionisalsodeprecatedsinceitismorelikelythattheexplosiveswillbediscoverediftheyareattachedtosuchatriggerandmoreoveritwouldbedifficulttocoordinatethechargesusingsuchadevicestopthechargesthemselvesaresmallbutthegeometryofthepackagewillfocustheblastsoitisimperativethatyouinstallthesechargesinaccordancewiththemanufacturersinstructionsstopinordertomaximisethedamagetothetowerstheengineersrecommendthatyousetchargesonthreeofthelegsofeachtowerwithchargestwoandthreesettoexplodeinsequenceafterchargeonestopsetanadditionaldelayofthirtysecondsforchargetwoandoneminutetwentyfivesecondsforchargethreestopasthefirstlegbucklesitwillstresstheframesothattheshockwaveofthesecondchargewilldistortthesupportingmembersstopwiththethirdexplosiontheframeshouldbuckleresultinginthetotaldestructionofthetowersbutthissequencewillmakesiteclearanceandreconstructionhardertoaccomplishstopthedelaywithchargethreealsoincreasesthelikelihoodthatsoldierswillhavearrivedonsiteintimetobecaughtinthethirdblastincreasingconfusionandlossofmoralestopifitispossibletoclimbthetowerinadvanceofthedemolitiontogetmoredetailedimagesoftheaerialandamplifiercircuitrythenthisshouldbeattemptedhoweverifthereisanyguardpresencethennorisksshouldbetakeninthisregardstopwemustleaveittoyoutodeterminethemosteffectivetargetsfortheoperationbutthedemolitionmusthappensimultaneouslyatallsitesfortworeasonsstopfirstinordertopreventourenemyfromdisruptingtheoperationoncetheyrealisewhatishappeningstopsecondwemustleavenodoubtthatthiswasanactofwarstopthereisariskthatthebritishgovernmentmaytrytoreachanaccommodationwiththefuhrerdividingtheworldbetweentheirdyingempireandoursjustasitisbornstoptheonlywaytoensurethatwecantrulysupplantthemistodrawthemintoawartheycannotwinandthisprojectwillbetheprovocationthatensuresthatthiswillhappenstoptheplanningdivisionhasdeterminedthatjanuaryfirstwillbetheoptimalnightfortheattackasitcoincideswithanewmoonstoptheysuggestthatyousplitintotwoteamstoattacktheedmundstcaistorandcanewdonsitesopeningacorridoralongthethamesforourforthcomingairraidsstopthesupportteamsshouldsetuplookoutpostsatthetargetsinadvanceoftheattacksothatyoucanmonitorguardmovementsandmakeafinalassessmentofthesecuritystopfollowingtheoperationthesabotageteamsshouldrendezvoustogetherwiththesupportteamsatthehomeofthelocalortsgruppechiefinsouthmaldonstopauboatwillstandbytopickyouallupatthreefortysevenjanuarysecondwithafallbackrendezvousofonethirteenonthethirteenthwhenthesearchshouldhavedieddownstopyouwillneedtogainaccesstoaboatcapableofcarryingyouallouttomeetitstopthereareverymanyfishingvesselsinthisneighbourhoodandwerecommendstealingoneaftertheoperationstopitmightfeellesssecurethatobtainingoneinadvancehoweverwemustdoeverythingwecantopreventsuspicioninadvanceoftheoperationstopifthismissionsucceedsthenitwillbeonlyamatterofdaysbeforethewarbeginsandyourthreecomradesinlondonwillplayacrucialroleincoordinatingourintelligenceeffortsbehindenemylinesstopwehavebeenwatchingandlisteningcarefullyforsignsthattheoperationcouldhavebeencompromisedandasaresultofthoseenquirieswehavediscoveredanewtopsecretagencyknownonlybytheacronymbossstopwehavebeenunabletoinfiltratethisgroupbutitisknownthattheleaderissomeonewiththeinitialhandthattheyaretakingtheleadonsignalsintelligencestoptheheadofthecounterintelligencebranchusesthecodenamepearlandwewillbemakingeveryefforttodiscoverheridentitystopwhilethedeclarationofwarandthedestructionoftherdfsystemarethecentralgoalsofthisoperationthelondontrianglewillbekeytoensuringaflowofhighqualityintelligencetoinformourbattleplansstopwithouttheircommunicationswewillbeunabletomonitorbritishplansplacinggermanlivesatunnecessaryriskstopifthereisanychancethatmembersofyourgroupcouldbecapturedandinterrogatedthenyoushouldabandonthesabotageoperationandreturntotirpitzuferstopprotectingtheidentityofthetriangleisoffargreaterlongtermimportancetousstopwecanfindotherwaystoprovokethewarbutwewouldfinditmoredifficulttoensurethatwecanwinitwithoutanetworkofagentsinthecapitalstopthemissionwillberegardedasasuccessonlyifwecanguaranteetheirsafetystoptoincreasethesecurityofthelondontriangleitiscrucialthattheclockcipherdeviceandtheassociatedcodebooksreachourlondonagentsstopthedevicecannotbeallowedtofallintoenemyhandsandthismustbethetopprioritystopifyouarecapturedthenthecodebookcontainingthekeystotheciphermustbedestroyedstopitisprintedonspecialpaperthatshouldeasilydissolvebutitcanalsobeingestedifnecessarystopwhenusingthemachinetakecaretoerasethecipheralphabetafteruseandtodeletethekeyfromthecodebooktoensurethatnooneusesthesamekeytwicestopthiswillalsoreducetheriskofthekeyedcipherfallingintoenemyhandsstopifcaptureappearsimminentthenuseoneoftheshapedchargestodestroythedevicepreferablyburyingittogetherwiththechargetoincreasethedestructivepowerandmakeithardertoreconstructstopeveryoneinthemovementwillbeprayingforyoursuccessandyourcourageandcommitmenttothefatherlandwillbepraisedforeverstopyouareaninspirationtousallstopwishingyouluckinthefinalphaseoftheoperationstopyoursunclewilhelm'"
 935       ]
 936      },
 937      "execution_count": 222,
 938      "metadata": {},
 939      "output_type": "execute_result"
 940     }
 941    ],
 942    "source": [
 943     "caesar_decipher(c_gen, 12)"
 944    ]
 945   },
 946   {
 947    "cell_type": "code",
 948    "execution_count": 229,
 949    "metadata": {
 950     "Collapsed": "false"
 951    },
 952    "outputs": [
 953     {
 954      "data": {
 955       "text/plain": [
 956        "'karloperationcathedraltowerhasbeenapprovedandouragentsarearrangingtoprovideyouwiththetntyourequestedinyourlastmessagestopthiswillbeshippedonadutchfishingvesselwhichwilllandatthemarshesoffoldleighattwoamonfridaydecembertenthstoptheywillsignaltheirarrivalbyflashingtheirnavigationlightsinmorsecodetospelloutthewordflatandyouwillreplytyrestopifyoubelievethatyouarebeingwatchedthenabandontherendezvousandtryagainatintervalsoftwodaysthreedaysfivedaysandsevendaysstopdonotattempttomakecontactwiththeboatoritscrewinanyotherwaystoptheexplosiveisstablebutshouldbetreatedwithcarestopthefusesarethemostrecentproductofourresearchandtechnologydivisionandcarrytripletriggersstoptheyhaveatimercircuitwhichmaybesetforanyperiodfromthreeminutestoseventeenhoursstoptheycanalsobetriggeredbyatripwireassemblyorthefusemechanismcanbereplacedwithahandgrenademechanismstopsincethesechargeshavebeenshapedfordemolitionusewedonotrecommendusingthesedevicesincombatsinceyouhavenocertaintythatthechargewilllandinanorientationthatwillmaximiseitsdestructivepotentialstopthetripwireoptionisalsodeprecatedsinceitismorelikelythattheexplosiveswillbediscoverediftheyareattachedtosuchatriggerandmoreoveritwouldbedifficulttocoordinatethechargesusingsuchadevicestopthechargesthemselvesaresmallbutthegeometryofthepackagewillfocustheblastsoitisimperativethatyouinstallthesechargesinaccordancewiththemanufacturersinstructionsstopinordertomaximisethedamagetothetowerstheengineersrecommendthatyousetchargesonthreeofthelegsofeachtowerwithchargestwoandthreesettoexplodeinsequenceafterchargeonestopsetanadditionaldelayofthirtysecondsforchargetwoandoneminutetwentyfivesecondsforchargethreestopasthefirstlegbucklesitwillstresstheframesothattheshockwaveofthesecondchargewilldistortthesupportingmembersstopwiththethirdexplosiontheframeshouldbuckleresultinginthetotaldestructionofthetowersbutthissequencewillmakesiteclearanceandreconstructionhardertoaccomplishstopthedelaywithchargethreealsoincreasesthelikelihoodthatsoldierswillhavearrivedonsiteintimetobecaughtinthethirdblastincreasingconfusionandlossofmoralestopifitispossibletoclimbthetowerinadvanceofthedemolitiontogetmoredetailedimagesoftheaerialandamplifiercircuitrythenthisshouldbeattemptedhoweverifthereisanyguardpresencethennorisksshouldbetakeninthisregardstopwemustleaveittoyoutodeterminethemosteffectivetargetsfortheoperationbutthedemolitionmusthappensimultaneouslyatallsitesfortworeasonsstopfirstinordertopreventourenemyfromdisruptingtheoperationoncetheyrealisewhatishappeningstopsecondwemustleavenodoubtthatthiswasanactofwarstopthereisariskthatthebritishgovernmentmaytrytoreachanaccommodationwiththefuhrerdividingtheworldbetweentheirdyingempireandoursjustasitisbornstoptheonlywaytoensurethatwecantrulysupplantthemistodrawthemintoawartheycannotwinandthisprojectwillbetheprovocationthatensuresthatthiswillhappenstoptheplanningdivisionhasdeterminedthatjanuaryfirstwillbetheoptimalnightfortheattackasitcoincideswithanewmoonstoptheysuggestthatyousplitintotwoteamstoattacktheedmundstcaistorandcanewdonsitesopeningacorridoralongthethamesforourforthcomingairraidsstopthesupportteamsshouldsetuplookoutpostsatthetargetsinadvanceoftheattacksothatyoucanmonitorguardmovementsandmakeafinalassessmentofthesecuritystopfollowingtheoperationthesabotageteamsshouldrendezvoustogetherwiththesupportteamsatthehomeofthelocalortsgruppechiefinsouthmaldonstopauboatwillstandbytopickyouallupatthreefortysevenjanuarysecondwithafallbackrendezvousofonethirteenonthethirteenthwhenthesearchshouldhavedieddownstopyouwillneedtogainaccesstoaboatcapableofcarryingyouallouttomeetitstopthereareverymanyfishingvesselsinthisneighbourhoodandwerecommendstealingoneaftertheoperationstopitmightfeellesssecurethatobtainingoneinadvancehoweverwemustdoeverythingwecantopreventsuspicioninadvanceoftheoperationstopifthismissionsucceedsthenitwillbeonlyamatterofdaysbeforethewarbeginsandyourthreecomradesinlondonwillplayacrucialroleincoordinatingourintelligenceeffortsbehindenemylinesstopwehavebeenwatchingandlisteningcarefullyforsignsthattheoperationcouldhavebeencompromisedandasaresultofthoseenquirieswehavediscoveredanewtopsecretagencyknownonlybytheacronymbossstopwehavebeenunabletoinfiltratethisgroupbutitisknownthattheleaderissomeonewiththeinitialhandthattheyaretakingtheleadonsignalsintelligencestoptheheadofthecounterintelligencebranchusesthecodenamepearlandwewillbemakingeveryefforttodiscoverheridentitystopwhilethedeclarationofwarandthedestructionoftherdfsystemarethecentralgoalsofthisoperationthelondontrianglewillbekeytoensuringaflowofhighqualityintelligencetoinformourbattleplansstopwithouttheircommunicationswewillbeunabletomonitorbritishplansplacinggermanlivesatunnecessaryriskstopifthereisanychancethatmembersofyourgroupcouldbecapturedandinterrogatedthenyoushouldabandonthesabotageoperationandreturntotirpitzuferstopprotectingtheidentityofthetriangleisoffargreaterlongtermimportancetousstopwecanfindotherwaystoprovokethewarbutwewouldfinditmoredifficulttoensurethatwecanwinitwithoutanetworkofagentsinthecapitalstopthemissionwillberegardedasasuccessonlyifwecanguaranteetheirsafetystoptoincreasethesecurityofthelondontriangleitiscrucialthattheclockcipherdeviceandtheassociatedcodebooksreachourlondonagentsstopthedevicecannotbeallowedtofallintoenemyhandsandthismustbethetopprioritystopifyouarecapturedthenthecodebookcontainingthekeystotheciphermustbedestroyedstopitisprintedonspecialpaperthatshouldeasilydissolvebutitcanalsobeingestedifnecessarystopwhenusingthemachinetakecaretoerasethecipheralphabetafteruseandtodeletethekeyfromthecodebooktoensurethatnooneusesthesamekeytwicestopthiswillalsoreducetheriskofthekeyedcipherfallingintoenemyhandsstopifcaptureappearsimminentthenuseoneoftheshapedchargestodestroythedevicepreferablyburyingittogetherwiththechargetoincreasethedestructivepowerandmakeithardertoreconstructstopeveryoneinthemovementwillbeprayingforyoursuccessandyourcourageandcommitmenttothefatherlandwillbepraisedforeverstopyouareaninspirationtousallstopwishingyouluckinthefinalphaseoftheoperationstopyoursunclewilhelm'"
 957       ]
 958      },
 959      "execution_count": 229,
 960      "metadata": {},
 961      "output_type": "execute_result"
 962     }
 963    ],
 964    "source": [
 965     "cipherstream = zip(cycle(p_alpha), cycle(rotated_c_alpha))\n",
 966     "p_gen, s = decipher_message(scb, cipherstream)\n",
 967     "p_gen"
 968    ]
 969   },
 970   {
 971    "cell_type": "code",
 972    "execution_count": 233,
 973    "metadata": {
 974     "Collapsed": "false"
 975    },
 976    "outputs": [],
 977    "source": [
 978     "pb = prettify(p_gen)"
 979    ]
 980   },
 981   {
 982    "cell_type": "code",
 983    "execution_count": 235,
 984    "metadata": {
 985     "Collapsed": "false"
 986    },
 987    "outputs": [
 988     {
 989      "data": {
 990       "text/plain": [
 991        "7298"
 992       ]
 993      },
 994      "execution_count": 235,
 995      "metadata": {},
 996      "output_type": "execute_result"
 997     }
 998    ],
 999    "source": [
1000     "open(plaintext_b_filename, 'w').write(pb)"
1001    ]
1002   },
1003   {
1004    "cell_type": "code",
1005    "execution_count": null,
1006    "metadata": {
1007     "Collapsed": "false"
1008    },
1009    "outputs": [],
1010    "source": []
1011   }
1012  ],
1013  "metadata": {
1014   "jupytext": {
1015    "formats": "ipynb,md"
1016   },
1017   "kernelspec": {
1018    "display_name": "Python 3",
1019    "language": "python",
1020    "name": "python3"
1021   },
1022   "language_info": {
1023    "codemirror_mode": {
1024     "name": "ipython",
1025     "version": 3
1026    },
1027    "file_extension": ".py",
1028    "mimetype": "text/x-python",
1029    "name": "python",
1030    "nbconvert_exporter": "python",
1031    "pygments_lexer": "ipython3",
1032    "version": "3.7.4"
1033   }
1034  },
1035  "nbformat": 4,
1036  "nbformat_minor": 4
1037 }