2020-early/2020-a-challenge1.md

   1 ---
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  11     display_name: Python 3
  12     language: python
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  14 ---
  15
  16 ```python
  17 import os,sys,inspect
  18 currentdir = os.path.dirname(os.path.abspath(inspect.getfile(inspect.currentframe())))
  19 parentdir = os.path.dirname(currentdir)
  20 sys.path.insert(0,parentdir)
  21 ```
  22
  23 ```python
  24 from cipher.caesar import *
  25 from cipher.affine import *
  26 ```
  27
  28 ```python
  29 challenge_number = 1
  30 plaintext_a_filename = f'{challenge_number}a.plaintext'
  31 plaintext_b_filename = f'{challenge_number}b.plaintext'
  32 ciphertext_a_filename = f'{challenge_number}a.ciphertext'
  33 ciphertext_b_filename = f'{challenge_number}b.ciphertext'
  34 ```
  35
  36 ```python
  37 ca = open(ciphertext_a_filename).read()
  38 cb = open(ciphertext_b_filename).read()
  39
  40 ```
  41
  42 ```python
  43 k_a, score_a = caesar_break(ca)
  44 print(k_a, '\n')
  45 pa = caesar_decipher(ca, k_a)
  46 print(pa)
  47 ```
  48
  49 ```python
  50 open(plaintext_a_filename, 'w').write(pa)
  51 ```
  52
  53 ```python
  54 k_b, score_b = caesar_break(cb)
  55 print(k_b, '\n')
  56 pb = caesar_decipher(cb, k_b)
  57 print(pb)
  58 ```
  59
  60 ```python
  61 open(plaintext_b_filename, 'w').write(pb)
  62 ```
  63
  64 ```python
  65
  66 ```