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<p>Implementation of <a href="https://en.wikipedia.org/wiki/Caesar_cipher">Caesar cipher</a> algorithm.
<a href="#details">More...</a></p>
<div class="textblock"><code>#include &lt;iostream&gt;</code><br />
<code>#include &lt;string&gt;</code><br />
<code>#include &lt;cassert&gt;</code><br />
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Include dependency graph for caesar_cipher.cpp:</div>
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<tr class="memdesc:dd/d81/namespacecaesar"><td class="mdescLeft">&#160;</td><td class="mdescRight">Functions for <a href="https://en.wikipedia.org/wiki/Caesar_cipher">Caesar cipher</a> algorithm. <br /></td></tr>
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Functions</h2></td></tr>
<tr class="memitem:ac3381121289548640b1c27a58a8524c3"><td class="memItemLeft" align="right" valign="top"><a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d6/d2c/caesar__cipher_8cpp.html#ac3381121289548640b1c27a58a8524c3">ciphers::caesar::encrypt</a> (const <a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a> &amp;text, const int &amp;shift)</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>Implementation of <a href="https://en.wikipedia.org/wiki/Caesar_cipher">Caesar cipher</a> algorithm. </p>
<p>In cryptography, a Caesar cipher, also known as Caesar's cipher, the shift cipher, Caesar's code or Caesar shift, is one of the simplest and most widely known encryption techniques. It is a type of substitution cipher in which each letter in the plaintext is replaced by a letter some fixed number of positions down the alphabet. For example, with a left shift of 3, D would be replaced by A, E would become B, and so on. The method is named after Julius Caesar, who used it in his private correspondence.</p>
<h3><a class="anchor" id="autotoc_md0"></a>
Algorithm</h3>
<p>The encryption can also be represented using modular arithmetic by first transforming the letters into numbers, according to the scheme, A → 0, B → 1, ..., Z → 25. Encryption of a letter x by a shift n can be described mathematically as, </p><p class="formulaDsp">
\[ E(x) = (x + n)\;\mbox{mod}\; 26\]
</p>
<p> while decryption can be described as, </p><p class="formulaDsp">
\[ D(x) = (x - n) \;\mbox{mod}\; 26\]
</p>
<dl class="section note"><dt>Note</dt><dd>This program implements caesar cipher for only uppercase English alphabet characters (i.e. A-Z).</dd></dl>
<dl class="section author"><dt>Author</dt><dd><a href="https://github.com/imdeep2905">Deep Raval</a> </dd></dl>
</div><h2 class="groupheader">Function Documentation</h2>
<a id="a355e69511cd2006b5c4c80ae95b71056"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a355e69511cd2006b5c4c80ae95b71056">&#9670;&nbsp;</a></span>decrypt()</h2>
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<td class="paramtype">const <a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a> &amp;&#160;</td>
<td class="paramname"><em>text</em>, </td>
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<p>Decrypt given text using caesar cipher. </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">text</td><td>text to be decrypted </td></tr>
<tr><td class="paramname">shift</td><td>number of shifts to be applied </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>new decrypted text </dd></dl>
<div class="fragment"><div class="line"><a name="l00081"></a><span class="lineno"> 81</span>&#160; {</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a> decrypted_text = <span class="stringliteral">&quot;&quot;</span>; <span class="comment">// Empty string to store decrypted text</span></div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>&#160; <span class="keywordflow">for</span> (<span class="keywordtype">char</span> c : text) { <span class="comment">// Going through each character</span></div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>&#160; <span class="keywordtype">int</span> place_value = get_value(c); <span class="comment">// Getting value of character (i.e. 0-25)</span></div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>&#160; place_value = (place_value - shift) % 26;<span class="comment">// Applying decryption formula</span></div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>&#160; <span class="keywordflow">if</span>(place_value &lt; 0) { <span class="comment">// Handling case where remainder is negative </span></div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>&#160; place_value = place_value + 26;</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>&#160; }</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>&#160; <span class="keywordtype">char</span> new_char = get_char(place_value); <span class="comment">// Getting original character from decrypted value (i.e. A-Z)</span></div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>&#160; decrypted_text += new_char; <span class="comment">// Appending decrypted character</span></div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>&#160; }</div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>&#160; <span class="keywordflow">return</span> decrypted_text; <span class="comment">// Returning decrypted text</span></div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>&#160; }</div>
<div class="ttc" id="abasic_string_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a></div></div>
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<h2 class="memtitle"><span class="permalink"><a href="#ac3381121289548640b1c27a58a8524c3">&#9670;&nbsp;</a></span>encrypt()</h2>
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<td>(</td>
<td class="paramtype">const <a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a> &amp;&#160;</td>
<td class="paramname"><em>text</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">const int &amp;&#160;</td>
<td class="paramname"><em>shift</em>&#160;</td>
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<p>Encrypt given text using caesar cipher. </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">text</td><td>text to be encrypted </td></tr>
<tr><td class="paramname">shift</td><td>number of shifts to be applied </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>new encrypted text </dd></dl>
<div class="fragment"><div class="line"><a name="l00065"></a><span class="lineno"> 65</span>&#160; {</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a> encrypted_text = <span class="stringliteral">&quot;&quot;</span>; <span class="comment">// Empty string to store encrypted text</span></div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>&#160; <span class="keywordflow">for</span> (<span class="keywordtype">char</span> c : text) { <span class="comment">// Going through each character</span></div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>&#160; <span class="keywordtype">int</span> place_value = get_value(c); <span class="comment">// Getting value of character (i.e. 0-25)</span></div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>&#160; place_value = (place_value + shift) % 26; <span class="comment">// Applying encryption formula</span></div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>&#160; <span class="keywordtype">char</span> new_char = get_char(place_value); <span class="comment">// Getting new character from new value (i.e. A-Z)</span></div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>&#160; encrypted_text += new_char; <span class="comment">// Appending encrypted character</span></div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>&#160; }</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>&#160; <span class="keywordflow">return</span> encrypted_text; <span class="comment">// Returning encrypted text</span></div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>&#160; }</div>
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<h2 class="memtitle"><span class="permalink"><a href="#ae66f6b31b5ad750f1fe042a706a4e3d4">&#9670;&nbsp;</a></span>main()</h2>
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<p>Driver Code </p>
<div class="fragment"><div class="line"><a name="l00120"></a><span class="lineno"> 120</span>&#160; {</div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>&#160; <span class="comment">// Testing</span></div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>&#160; <a class="code" href="../../d6/d2c/caesar__cipher_8cpp.html#ae1a3968e7947464bee7714f6d43b7002">test</a>();</div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>&#160; <span class="keywordflow">return</span> 0;</div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>&#160;}</div>
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<td class="memname">void test </td>
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<p>Function to test above algorithm </p>
<div class="fragment"><div class="line"><a name="l00100"></a><span class="lineno"> 100</span>&#160; {</div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>&#160; <span class="comment">// Test 1</span></div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a> text1 = <span class="stringliteral">&quot;ALANTURING&quot;</span>;</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a> encrypted1 = <a class="code" href="../../d6/d2c/caesar__cipher_8cpp.html#ac3381121289548640b1c27a58a8524c3">ciphers::caesar::encrypt</a>(text1, 17);</div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a> decrypted1 = <a class="code" href="../../d6/d2c/caesar__cipher_8cpp.html#a355e69511cd2006b5c4c80ae95b71056">ciphers::caesar::decrypt</a>(encrypted1, 17);</div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>&#160; assert(text1 == decrypted1);</div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot;Original text : &quot;</span> &lt;&lt; text1;</div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot; , Encrypted text (with shift = 21) : &quot;</span> &lt;&lt; encrypted1;</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot; , Decrypted text : &quot;</span>&lt;&lt; decrypted1 &lt;&lt; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>&#160; <span class="comment">// Test 2</span></div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a> text2 = <span class="stringliteral">&quot;HELLOWORLD&quot;</span>;</div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a> encrypted2 = <a class="code" href="../../d6/d2c/caesar__cipher_8cpp.html#ac3381121289548640b1c27a58a8524c3">ciphers::caesar::encrypt</a>(text2, 1729);</div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a> decrypted2 = <a class="code" href="../../d6/d2c/caesar__cipher_8cpp.html#a355e69511cd2006b5c4c80ae95b71056">ciphers::caesar::decrypt</a>(encrypted2, 1729);</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>&#160; assert(text2 == decrypted2);</div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot;Original text : &quot;</span> &lt;&lt; text2;</div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot; , Encrypted text (with shift = 1729) : &quot;</span> &lt;&lt; encrypted2;</div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot; , Decrypted text : &quot;</span>&lt;&lt; decrypted2 &lt;&lt; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>&#160;}</div>
<div class="ttc" id="abasic_ostream_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a></div></div>
<div class="ttc" id="acaesar__cipher_8cpp_html_a355e69511cd2006b5c4c80ae95b71056"><div class="ttname"><a href="../../d6/d2c/caesar__cipher_8cpp.html#a355e69511cd2006b5c4c80ae95b71056">ciphers::caesar::decrypt</a></div><div class="ttdeci">std::string decrypt(const std::string &amp;text, const int &amp;shift)</div><div class="ttdef"><b>Definition:</b> caesar_cipher.cpp:81</div></div>
<div class="ttc" id="acaesar__cipher_8cpp_html_ac3381121289548640b1c27a58a8524c3"><div class="ttname"><a href="../../d6/d2c/caesar__cipher_8cpp.html#ac3381121289548640b1c27a58a8524c3">ciphers::caesar::encrypt</a></div><div class="ttdeci">std::string encrypt(const std::string &amp;text, const int &amp;shift)</div><div class="ttdef"><b>Definition:</b> caesar_cipher.cpp:65</div></div>
<div class="ttc" id="aendl_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a></div><div class="ttdeci">T endl(T... args)</div></div>
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