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<title>Algorithms_in_C++: ciphers/caesar_cipher.cpp File Reference</title>
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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" target="_blank">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>
<div class="textblock"><p>Implementation of <a href="https://en.wikipedia.org/wiki/Caesar_cipher" target="_blank">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_md1"></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">
<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">
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<p >Decrypt given text using caesar cipher. </p><dl class="params"><dt>Parameters</dt><dd>
<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>
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<p >Encrypt given text using caesar cipher. </p><dl class="params"><dt>Parameters</dt><dd>
<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>
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<p >Driver Code </p>
<p>Driver Code </p>
<div class="fragment"><div class="line"><span class="lineno"> 120</span> {</div>
<div class="line"><span class="lineno"> 121</span> <span class="comment">// Testing</span></div>
<div class="line"><span class="lineno"> 122</span> <a class="code hl_function" href="../../d6/d2c/caesar__cipher_8cpp.html#ae1a3968e7947464bee7714f6d43b7002">test</a>();</div>
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<p >Function to test above algorithm </p>
<p>Function to test above algorithm </p>
<div class="fragment"><div class="line"><span class="lineno"> 100</span> {</div>
<div class="line"><span class="lineno"> 101</span> <span class="comment">// Test 1</span></div>
<div class="line"><span class="lineno"> 102</span> <a class="code hl_classRef" 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>
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