2020/2020-challenge5.md

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  11     display_name: Python 3
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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 = 5
  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 keyword_decipher(ca, 'akela', wrap_a)
  46 ```
  47
  48 ```python Collapsed="false"
  49 word_a, score_a = simulated_annealing_break(sca, fitness=Ptrigrams,
  50         plain_alphabet=string.ascii_lowercase, cipher_alphabet=keyword_cipher_alphabet_of('akkad', wrap_alphabet=KeywordWrapAlphabet.from_largest))
  51 print(word_a, '\n')
  52 pa = keyword_decipher(ca, word_a)
  53 print(pa)
  54 ```
  55
  56 ```python Collapsed="false"
  57 pa = prettify(keyword_decipher(sca, 'akela', wrap_alphabet=KeywordWrapAlphabet.from_a))
  58 print(pa)
  59 ```
  60
  61 ```python Collapsed="false"
  62 open(plaintext_a_filename, 'w').write(pa)
  63 ```
  64
  65 ```python Collapsed="false"
  66 (word_b, wrap_b), score_b = keyword_break_mp(scb, fitness=Ptrigrams)
  67 print(word_b, wrap_b, '\n')
  68 pb = keyword_decipher(cb, word_b, wrap_b)
  69 print(pb)
  70 ```
  71
  72 ```python Collapsed="false"
  73 pb = prettify(keyword_decipher(scb, word_b, wrap_b))
  74 print(pb)
  75 ```
  76
  77 ```python Collapsed="false"
  78 open(plaintext_b_filename, 'w').write(pb)
  79 ```
  80
  81 ```python Collapsed="false"
  82 pbs = pb.split()
  83 [pbs[i+1] for i, w in enumerate(pbs) if w == 'stop']
  84 ```
  85
  86 ```python Collapsed="false"
  87 cat(w[0] for w in pbs)
  88 ```
  89
  90 ```python Collapsed="false"
  91 [len(s.strip().split()) for s in pb.split('stop')]
  92 ```
  93
  94 ```python Collapsed="false"
  95 tt = ''.maketrans('rdf', 'RDF')
  96 pbcap = wcat(pb.split()).translate(tt)
  97 pbcap
  98 ```
  99
 100 ```python Collapsed="false"
 101 pbcap2 = cat(('\n' + c) if c.isupper() else c for c in pbcap)
 102 print(pbcap2)
 103 ```
 104
 105 ```python Collapsed="false"
 106
 107 ```