2021/2021-challenge2.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.caesar import *
  18 from szyfrow.affine import *
  19 ```
  20
  21 ```python Collapsed="false"
  22 challenge_number = 2
  23 plaintext_a_filename = f'plaintext.{challenge_number}a.txt'
  24 plaintext_b_filename = f'plaintext.{challenge_number}b.txt'
  25 ciphertext_a_filename = f'ciphertext.{challenge_number}a.txt'
  26 ciphertext_b_filename = f'ciphertext.{challenge_number}b.txt'
  27 ```
  28
  29 ```python Collapsed="false"
  30 ca = open(ciphertext_a_filename).read()
  31 cb = open(ciphertext_b_filename).read()
  32 ```
  33
  34 ```python
  35 affine_break(ca)
  36 ```
  37
  38 ```python Collapsed="false"
  39 (m_a, a_a, z_a), score_a = affine_break(ca)
  40 print(m_a, a_a, z_a, '\n')
  41 pa = affine_decipher(ca, m_a, a_a, z_a)
  42 print(pa)
  43 ```
  44
  45 ```python Collapsed="false"
  46 open(plaintext_a_filename, 'w').write(pa)
  47 ```
  48
  49 ```python
  50 (m_b, a_b, z_b), score_a = affine_break(cb)
  51 print(m_b, a_b, z_b, '\n')
  52 pb = affine_decipher(cb, m_b, a_b, z_b)
  53 print(pb)
  54 ```
  55
  56 ```python Collapsed="false"
  57 open(plaintext_b_filename, 'w').write(pb)
  58 ```
  59
  60 ```python Collapsed="false"
  61
  62 ```