2020/2020-challenge4.md

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  11     display_name: Python 3
  12     language: python
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  14 ---
  15
  16 ```python Collapsed="false"
  17 from szyfrow.keyword_cipher import *
  18 from szyfrow.column_transposition import *
  19 from szyfrow.support.text_prettify import *
  20 ```
  21
  22 ```python Collapsed="false"
  23 challenge_number = 4
  24 plaintext_a_filename = f'plaintext.{challenge_number}a.txt'
  25 plaintext_b_filename = f'plaintext.{challenge_number}b.txt'
  26 ciphertext_a_filename = f'ciphertext.{challenge_number}a.txt'
  27 ciphertext_b_filename = f'ciphertext.{challenge_number}b.txt'
  28 ```
  29
  30 ```python Collapsed="false"
  31 ca = open(ciphertext_a_filename).read()
  32 sca = sanitise(ca)
  33 cb = open(ciphertext_b_filename).read()
  34 scb = sanitise(cb)
  35 ```
  36
  37 ```python Collapsed="false"
  38 (word_a, wrap_a), score_a = keyword_break_mp(sca, fitness=Ptrigrams)
  39 print(word_a, wrap_a, '\n')
  40 pa = keyword_decipher(ca, word_a, wrap_a)
  41 print(pa)
  42 ```
  43
  44 ```python Collapsed="false"
  45 word_a, score_a = simulated_annealing_break(sca, fitness=Ptrigrams,
  46         plain_alphabet=string.ascii_lowercase, cipher_alphabet=keyword_cipher_alphabet_of('akkad', wrap_alphabet=KeywordWrapAlphabet.from_largest))
  47 print(word_a, '\n')
  48 pa = keyword_decipher(ca, word_a)
  49 print(pa)
  50 ```
  51
  52 ```python Collapsed="false"
  53 pa = keyword_decipher(ca, 'akela', wrap_alphabet=KeywordWrapAlphabet.from_largest)
  54 print(pa)
  55 ```
  56
  57 ```python Collapsed="false"
  58 open(plaintext_a_filename, 'w').write(pa)
  59 ```
  60
  61 ```python Collapsed="false"
  62 clue_dict = ['alerting', 'altering', 'integral', 'relating', 'triangle', 'angriest', 'gantries', 'granites', 'ingrates', 'rangiest', 'tangiers',
  63              'dniester', 'inserted', 'nerdiest', 'resident', 'trendies', 'respects', 'scepters', 'sceptres', 'specters', 'spectres', 'restrain',
  64              'retrains', 'strainer', 'terrains', 'trainers']
  65 clue_trans = [transpositions_of(w) for w in clue_dict]
  66 ```
  67
  68 ```python Collapsed="false"
  69 (trans_b, fill_b, empty_b), score_b = column_transposition_break(scb, translist=clue_trans, fitness=Ptrigrams)
  70 print(trans_b, fill_b, empty_b, '\n')
  71 pb = column_transposition_decipher(cb, trans_b,
  72     fillcolumnwise=fill_b,
  73     emptycolumnwise=empty_b)
  74 print(pb)
  75 ```
  76
  77 ```python Collapsed="false"
  78 (trans_b, fill_b, empty_b), score_b = column_transposition_break(scb, fitness=Ptrigrams)
  79 print(trans_b, fill_b, empty_b, '\n')
  80 ```
  81
  82 ```python Collapsed="false"
  83 pb = prettify(column_transposition_decipher(scb, trans_b,
  84     fillcolumnwise=fill_b,
  85     emptycolumnwise=empty_b))
  86 print(pb)
  87 ```
  88
  89 ```python Collapsed="false"
  90 transpositions[trans_b]
  91 ```
  92
  93 ```python Collapsed="false"
  94 open(plaintext_b_filename, 'w').write(pb)
  95 ```
  96
  97 ```python Collapsed="false"
  98
  99 ```