Done challenge 4

[cipher-tools.git] / 2020-early / 2020-a-challenge2.md

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+---
+jupyter:
+  jupytext:
+    formats: ipynb,md
+    text_representation:
+      extension: .md
+      format_name: markdown
+      format_version: '1.2'
+      jupytext_version: 1.3.4
+  kernelspec:
+    display_name: Python 3
+    language: python
+    name: python3
+---
+
+```python
+import os,sys,inspect
+currentdir = os.path.dirname(os.path.abspath(inspect.getfile(inspect.currentframe())))
+parentdir = os.path.dirname(currentdir)
+sys.path.insert(0,parentdir) 
+```
+
+```python
+from cipher.caesar import *
+from cipher.affine import *
+
+from support.text_prettify import *
+from support.utilities import *
+from support.plot_frequency_histogram import *
+```
+
+```python
+challenge_number = 2
+plaintext_a_filename = f'{challenge_number}a.plaintext'
+plaintext_b_filename = f'{challenge_number}b.plaintext'
+ciphertext_a_filename = f'{challenge_number}a.ciphertext'
+ciphertext_b_filename = f'{challenge_number}b.ciphertext'
+```
+
+```python
+ca = open(ciphertext_a_filename).read()
+cb = open(ciphertext_b_filename).read()
+
+sca = sanitise(ca)
+pca = letters(ca)
+pta = depunctuate(ca)
+
+scb = sanitise(cb)
+pcb = letters(cb)
+ptb = depunctuate(cb)
+```
+
+```python
+(ma, ca, za), score_a = affine_break(sca)
+print((ma, ca, za), '\n')
+pa = repunctuate(affine_decipher(sca, ma, ca, za), pta)
+print(pa)
+```
+
+```python
+open(plaintext_a_filename, 'w').write(pa)
+```
+
+```python
+(mb, cb, zb), score_a = affine_break(scb)
+print((mb, cb, zb), '\n')
+pb = repunctuate(affine_decipher(scb, mb, cb, zb), ptb)
+print(pb)
+```
+
+```python
+open(plaintext_b_filename, 'w').write(pb)
+```
+
+```python
+
+```