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+Also attempts to break messages that use a Caesar â¦" />
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+<article id="content">
+<header>
+<h1 class="title">Module <code>szyfrow.caesar</code></h1>
+</header>
+<section id="section-intro">
+<p>Enciphering and deciphering using the <a href="https://en.wikipedia.org/wiki/Caesar_cipher">Caesar cipher</a>.
+Also attempts to break messages that use a Caesar cipher.</p>
+<p>The Caesar cipher operates one letter at a time. It converts each letter to a
+number, then enciphers that number by adding the key. The result is taken mod
+26 and converted back into a letter.</p>
+<details class="source">
+<summary>
+<span>Expand source code</span>
+</summary>
+<pre><code class="python">"""Enciphering and deciphering using the [Caesar cipher](https://en.wikipedia.org/wiki/Caesar_cipher).
+Also attempts to break messages that use a Caesar cipher.
+
+The Caesar cipher operates one letter at a time. It converts each letter to a
+number, then enciphers that number by adding the key. The result is taken mod
+26 and converted back into a letter.
+
+"""
+
+from szyfrow.support.utilities import *
+from szyfrow.support.language_models import *
+
+def caesar_encipher_letter(accented_letter, shift):
+ """Encipher a letter, given a shift amount.
+
+ Accented version of latin letters (such as é and ö) are converted to their
+ non-accented versions before encryption.
+
+ >>> caesar_encipher_letter('a', 1)
+ 'b'
+ >>> caesar_encipher_letter('a', 2)
+ 'c'
+ >>> caesar_encipher_letter('b', 2)
+ 'd'
+ >>> caesar_encipher_letter('x', 2)
+ 'z'
+ >>> caesar_encipher_letter('y', 2)
+ 'a'
+ >>> caesar_encipher_letter('z', 2)
+ 'b'
+ >>> caesar_encipher_letter('z', -1)
+ 'y'
+ >>> caesar_encipher_letter('a', -1)
+ 'z'
+ >>> caesar_encipher_letter('A', 1)
+ 'B'
+ >>> caesar_encipher_letter('é', 1)
+ 'f'
+ """
+ # letter = unaccent(accented_letter)
+ # if letter in string.ascii_letters:
+ # if letter in string.ascii_uppercase:
+ # alphabet_start = ord('A')
+ # else:
+ # alphabet_start = ord('a')
+ # return chr(((ord(letter) - alphabet_start + shift) % 26) +
+ # alphabet_start)
+ # else:
+ # return letter
+
+ letter = unaccent(accented_letter)
+ if letter in string.ascii_letters:
+ cipherletter = unpos(pos(letter) + shift)
+ if letter in string.ascii_uppercase:
+ return cipherletter.upper()
+ else:
+ return cipherletter
+ else:
+ return letter
+
+def caesar_decipher_letter(letter, shift):
+ """Decipher a letter, given a shift amount
+
+ >>> caesar_decipher_letter('b', 1)
+ 'a'
+ >>> caesar_decipher_letter('b', 2)
+ 'z'
+ """
+ return caesar_encipher_letter(letter, -shift)
+
+def caesar_encipher(message, shift):
+ """Encipher a message with the Caesar cipher of given shift
+
+ >>> caesar_encipher('abc', 1)
+ 'bcd'
+ >>> caesar_encipher('abc', 2)
+ 'cde'
+ >>> caesar_encipher('abcxyz', 2)
+ 'cdezab'
+ >>> caesar_encipher('ab cx yz', 2)
+ 'cd ez ab'
+ >>> caesar_encipher('Héllo World!', 2)
+ 'Jgnnq Yqtnf!'
+ """
+ enciphered = [caesar_encipher_letter(l, shift) for l in message]
+ return cat(enciphered)
+
+def caesar_decipher(message, shift):
+ """Decipher a message with the Caesar cipher of given shift
+
+ >>> caesar_decipher('bcd', 1)
+ 'abc'
+ >>> caesar_decipher('cde', 2)
+ 'abc'
+ >>> caesar_decipher('cd ez ab', 2)
+ 'ab cx yz'
+ >>> caesar_decipher('Jgnnq Yqtnf!', 2)
+ 'Hello World!'
+ """
+ return caesar_encipher(message, -shift)
+
+
+def caesar_break(message, fitness=Pletters):
+ """Breaks a Caesar cipher using frequency analysis
+
+ It tries all possible keys, scores the fitness of the text decipherd with
+ each key, and returns the key that produces the most fit deciphered text.
+
+ >>> caesar_break('ibxcsyorsaqcheyklxivoexlevmrimwxsfiqevvmihrsasrxliwyrh' \
+ 'ecjsppsamrkwleppfmergefifvmhixscsymjcsyqeoixlm') # doctest: +ELLIPSIS
+ (4, -130.849989015...)
+ >>> caesar_break('wxwmaxdgheetgwuxztgptedbgznitgwwhpguxyhkxbmhvvtlbhgtee' \
+ 'raxlmhiixweblmxgxwmhmaxybkbgztgwztsxwbgmxgmert') # doctest: +ELLIPSIS
+ (19, -128.82410410...)
+ >>> caesar_break('yltbbqnqnzvguvaxurorgenafsbezqvagbnornfgsbevpnaabjurer' \
+ 'svaquvzyvxrnznazlybequrvfohgriraabjtbaruraprur') # doctest: +ELLIPSIS
+ (13, -126.25403935...)
+ """
+ sanitised_message = sanitise(message)
+ best_shift = 0
+ best_fit = float('-inf')
+ for shift in range(26):
+ plaintext = caesar_decipher(sanitised_message, shift)
+ fit = fitness(plaintext)
+
+ if fit > best_fit:
+ best_fit = fit
+ best_shift = shift
+
+ return best_shift, best_fit</code></pre>
+</details>
+</section>
+<section>
+</section>
+<section>
+</section>
+<section>
+<h2 class="section-title" id="header-functions">Functions</h2>
+<dl>
+<dt id="szyfrow.caesar.caesar_break"><code class="name flex">
+<span>def <span class="ident">caesar_break</span></span>(<span>message, fitness=<function Pletters>)</span>
+</code></dt>
+<dd>
+<div class="desc"><p>Breaks a Caesar cipher using frequency analysis</p>
+<p>It tries all possible keys, scores the fitness of the text decipherd with
+each key, and returns the key that produces the most fit deciphered text.</p>
+<pre><code class="language-python-repl">>>> caesar_break('ibxcsyorsaqcheyklxivoexlevmrimwxsfiqevvmihrsasrxliwyrh' 'ecjsppsamrkwleppfmergefifvmhixscsymjcsyqeoixlm') # doctest: +ELLIPSIS
+(4, -130.849989015...)
+>>> caesar_break('wxwmaxdgheetgwuxztgptedbgznitgwwhpguxyhkxbmhvvtlbhgtee' 'raxlmhiixweblmxgxwmhmaxybkbgztgwztsxwbgmxgmert') # doctest: +ELLIPSIS
+(19, -128.82410410...)
+>>> caesar_break('yltbbqnqnzvguvaxurorgenafsbezqvagbnornfgsbevpnaabjurer' 'svaquvzyvxrnznazlybequrvfohgriraabjtbaruraprur') # doctest: +ELLIPSIS
+(13, -126.25403935...)
+</code></pre></div>
+<details class="source">
+<summary>
+<span>Expand source code</span>
+</summary>
+<pre><code class="python">def caesar_break(message, fitness=Pletters):
+ """Breaks a Caesar cipher using frequency analysis
+
+ It tries all possible keys, scores the fitness of the text decipherd with
+ each key, and returns the key that produces the most fit deciphered text.
+
+ >>> caesar_break('ibxcsyorsaqcheyklxivoexlevmrimwxsfiqevvmihrsasrxliwyrh' \
+ 'ecjsppsamrkwleppfmergefifvmhixscsymjcsyqeoixlm') # doctest: +ELLIPSIS
+ (4, -130.849989015...)
+ >>> caesar_break('wxwmaxdgheetgwuxztgptedbgznitgwwhpguxyhkxbmhvvtlbhgtee' \
+ 'raxlmhiixweblmxgxwmhmaxybkbgztgwztsxwbgmxgmert') # doctest: +ELLIPSIS
+ (19, -128.82410410...)
+ >>> caesar_break('yltbbqnqnzvguvaxurorgenafsbezqvagbnornfgsbevpnaabjurer' \
+ 'svaquvzyvxrnznazlybequrvfohgriraabjtbaruraprur') # doctest: +ELLIPSIS
+ (13, -126.25403935...)
+ """
+ sanitised_message = sanitise(message)
+ best_shift = 0
+ best_fit = float('-inf')
+ for shift in range(26):
+ plaintext = caesar_decipher(sanitised_message, shift)
+ fit = fitness(plaintext)
+
+ if fit > best_fit:
+ best_fit = fit
+ best_shift = shift
+
+ return best_shift, best_fit</code></pre>
+</details>
+</dd>
+<dt id="szyfrow.caesar.caesar_decipher"><code class="name flex">
+<span>def <span class="ident">caesar_decipher</span></span>(<span>message, shift)</span>
+</code></dt>
+<dd>
+<div class="desc"><p>Decipher a message with the Caesar cipher of given shift</p>
+<pre><code class="language-python-repl">>>> caesar_decipher('bcd', 1)
+'abc'
+>>> caesar_decipher('cde', 2)
+'abc'
+>>> caesar_decipher('cd ez ab', 2)
+'ab cx yz'
+>>> caesar_decipher('Jgnnq Yqtnf!', 2)
+'Hello World!'
+</code></pre></div>
+<details class="source">
+<summary>
+<span>Expand source code</span>
+</summary>
+<pre><code class="python">def caesar_decipher(message, shift):
+ """Decipher a message with the Caesar cipher of given shift
+
+ >>> caesar_decipher('bcd', 1)
+ 'abc'
+ >>> caesar_decipher('cde', 2)
+ 'abc'
+ >>> caesar_decipher('cd ez ab', 2)
+ 'ab cx yz'
+ >>> caesar_decipher('Jgnnq Yqtnf!', 2)
+ 'Hello World!'
+ """
+ return caesar_encipher(message, -shift)</code></pre>
+</details>
+</dd>
+<dt id="szyfrow.caesar.caesar_decipher_letter"><code class="name flex">
+<span>def <span class="ident">caesar_decipher_letter</span></span>(<span>letter, shift)</span>
+</code></dt>
+<dd>
+<div class="desc"><p>Decipher a letter, given a shift amount</p>
+<pre><code class="language-python-repl">>>> caesar_decipher_letter('b', 1)
+'a'
+>>> caesar_decipher_letter('b', 2)
+'z'
+</code></pre></div>
+<details class="source">
+<summary>
+<span>Expand source code</span>
+</summary>
+<pre><code class="python">def caesar_decipher_letter(letter, shift):
+ """Decipher a letter, given a shift amount
+
+ >>> caesar_decipher_letter('b', 1)
+ 'a'
+ >>> caesar_decipher_letter('b', 2)
+ 'z'
+ """
+ return caesar_encipher_letter(letter, -shift)</code></pre>
+</details>
+</dd>
+<dt id="szyfrow.caesar.caesar_encipher"><code class="name flex">
+<span>def <span class="ident">caesar_encipher</span></span>(<span>message, shift)</span>
+</code></dt>
+<dd>
+<div class="desc"><p>Encipher a message with the Caesar cipher of given shift</p>
+<pre><code class="language-python-repl">>>> caesar_encipher('abc', 1)
+'bcd'
+>>> caesar_encipher('abc', 2)
+'cde'
+>>> caesar_encipher('abcxyz', 2)
+'cdezab'
+>>> caesar_encipher('ab cx yz', 2)
+'cd ez ab'
+>>> caesar_encipher('Héllo World!', 2)
+'Jgnnq Yqtnf!'
+</code></pre></div>
+<details class="source">
+<summary>
+<span>Expand source code</span>
+</summary>
+<pre><code class="python">def caesar_encipher(message, shift):
+ """Encipher a message with the Caesar cipher of given shift
+
+ >>> caesar_encipher('abc', 1)
+ 'bcd'
+ >>> caesar_encipher('abc', 2)
+ 'cde'
+ >>> caesar_encipher('abcxyz', 2)
+ 'cdezab'
+ >>> caesar_encipher('ab cx yz', 2)
+ 'cd ez ab'
+ >>> caesar_encipher('Héllo World!', 2)
+ 'Jgnnq Yqtnf!'
+ """
+ enciphered = [caesar_encipher_letter(l, shift) for l in message]
+ return cat(enciphered)</code></pre>
+</details>
+</dd>
+<dt id="szyfrow.caesar.caesar_encipher_letter"><code class="name flex">
+<span>def <span class="ident">caesar_encipher_letter</span></span>(<span>accented_letter, shift)</span>
+</code></dt>
+<dd>
+<div class="desc"><p>Encipher a letter, given a shift amount.</p>
+<p>Accented version of latin letters (such as é and ö) are converted to their
+non-accented versions before encryption.</p>
+<pre><code class="language-python-repl">>>> caesar_encipher_letter('a', 1)
+'b'
+>>> caesar_encipher_letter('a', 2)
+'c'
+>>> caesar_encipher_letter('b', 2)
+'d'
+>>> caesar_encipher_letter('x', 2)
+'z'
+>>> caesar_encipher_letter('y', 2)
+'a'
+>>> caesar_encipher_letter('z', 2)
+'b'
+>>> caesar_encipher_letter('z', -1)
+'y'
+>>> caesar_encipher_letter('a', -1)
+'z'
+>>> caesar_encipher_letter('A', 1)
+'B'
+>>> caesar_encipher_letter('é', 1)
+'f'
+</code></pre></div>
+<details class="source">
+<summary>
+<span>Expand source code</span>
+</summary>
+<pre><code class="python">def caesar_encipher_letter(accented_letter, shift):
+ """Encipher a letter, given a shift amount.
+
+ Accented version of latin letters (such as é and ö) are converted to their
+ non-accented versions before encryption.
+
+ >>> caesar_encipher_letter('a', 1)
+ 'b'
+ >>> caesar_encipher_letter('a', 2)
+ 'c'
+ >>> caesar_encipher_letter('b', 2)
+ 'd'
+ >>> caesar_encipher_letter('x', 2)
+ 'z'
+ >>> caesar_encipher_letter('y', 2)
+ 'a'
+ >>> caesar_encipher_letter('z', 2)
+ 'b'
+ >>> caesar_encipher_letter('z', -1)
+ 'y'
+ >>> caesar_encipher_letter('a', -1)
+ 'z'
+ >>> caesar_encipher_letter('A', 1)
+ 'B'
+ >>> caesar_encipher_letter('é', 1)
+ 'f'
+ """
+ # letter = unaccent(accented_letter)
+ # if letter in string.ascii_letters:
+ # if letter in string.ascii_uppercase:
+ # alphabet_start = ord('A')
+ # else:
+ # alphabet_start = ord('a')
+ # return chr(((ord(letter) - alphabet_start + shift) % 26) +
+ # alphabet_start)
+ # else:
+ # return letter
+
+ letter = unaccent(accented_letter)
+ if letter in string.ascii_letters:
+ cipherletter = unpos(pos(letter) + shift)
+ if letter in string.ascii_uppercase:
+ return cipherletter.upper()
+ else:
+ return cipherletter
+ else:
+ return letter</code></pre>
+</details>
+</dd>
+<dt id="szyfrow.caesar.cat"><code class="name flex">
+<span>def <span class="ident">cat</span></span>(<span>iterable, /)</span>
+</code></dt>
+<dd>
+<div class="desc"><p>Concatenate any number of strings.</p>
+<p>The string whose method is called is inserted in between each given string.
+The result is returned as a new string.</p>
+<p>Example: '.'.join(['ab', 'pq', 'rs']) -> 'ab.pq.rs'</p></div>
+</dd>
+<dt id="szyfrow.caesar.lcat"><code class="name flex">
+<span>def <span class="ident">lcat</span></span>(<span>iterable, /)</span>
+</code></dt>
+<dd>
+<div class="desc"><p>Concatenate any number of strings.</p>
+<p>The string whose method is called is inserted in between each given string.
+The result is returned as a new string.</p>
+<p>Example: '.'.join(['ab', 'pq', 'rs']) -> 'ab.pq.rs'</p></div>
+</dd>
+<dt id="szyfrow.caesar.wcat"><code class="name flex">
+<span>def <span class="ident">wcat</span></span>(<span>iterable, /)</span>
+</code></dt>
+<dd>
+<div class="desc"><p>Concatenate any number of strings.</p>
+<p>The string whose method is called is inserted in between each given string.
+The result is returned as a new string.</p>
+<p>Example: '.'.join(['ab', 'pq', 'rs']) -> 'ab.pq.rs'</p></div>
+</dd>
+</dl>
+</section>
+<section>
+</section>
+</article>
+<nav id="sidebar">
+<h1>Index</h1>
+<div class="toc">
+<ul></ul>
+</div>
+<ul id="index">
+<li><h3>Super-module</h3>
+<ul>
+<li><code><a title="szyfrow" href="index.html">szyfrow</a></code></li>
+</ul>
+</li>
+<li><h3><a href="#header-functions">Functions</a></h3>
+<ul class="">
+<li><code><a title="szyfrow.caesar.caesar_break" href="#szyfrow.caesar.caesar_break">caesar_break</a></code></li>
+<li><code><a title="szyfrow.caesar.caesar_decipher" href="#szyfrow.caesar.caesar_decipher">caesar_decipher</a></code></li>
+<li><code><a title="szyfrow.caesar.caesar_decipher_letter" href="#szyfrow.caesar.caesar_decipher_letter">caesar_decipher_letter</a></code></li>
+<li><code><a title="szyfrow.caesar.caesar_encipher" href="#szyfrow.caesar.caesar_encipher">caesar_encipher</a></code></li>
+<li><code><a title="szyfrow.caesar.caesar_encipher_letter" href="#szyfrow.caesar.caesar_encipher_letter">caesar_encipher_letter</a></code></li>
+<li><code><a title="szyfrow.caesar.cat" href="#szyfrow.caesar.cat">cat</a></code></li>
+<li><code><a title="szyfrow.caesar.lcat" href="#szyfrow.caesar.lcat">lcat</a></code></li>
+<li><code><a title="szyfrow.caesar.wcat" href="#szyfrow.caesar.wcat">wcat</a></code></li>
+</ul>
+</li>
+</ul>
+</nav>
+</main>
+<footer id="footer">
+<p>Generated by <a href="https://pdoc3.github.io/pdoc"><cite>pdoc</cite> 0.9.2</a>.</p>
+</footer>
+</body>
+</html>
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