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<p>Implementation of <a href="https://en.wikipedia.org/wiki/Hill_cipher">Hill cipher</a> algorithm.
<p>Implementation of <a href="https://en.wikipedia.org/wiki/Hill_cipher" target="_blank">Hill cipher</a> algorithm.
<a href="#details">More...</a></p>
<div class="textblock"><code>#include &lt;cassert&gt;</code><br />
<code>#include &lt;cmath&gt;</code><br />
@@ -118,23 +117,23 @@ Include dependency graph for hill_cipher.cpp:</div>
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<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">class &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d6/d26/classciphers_1_1_hill_cipher.html">ciphers::HillCipher</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft">&#160;</td><td class="mdescRight">Implementation of <a href="https://en.wikipedia.org/wiki/Hill_cipher">Hill Cipher</a> algorithm. <a href="../../d6/d26/classciphers_1_1_hill_cipher.html#details">More...</a><br /></td></tr>
<tr class="memdesc:"><td class="mdescLeft">&#160;</td><td class="mdescRight">Implementation of <a href="https://en.wikipedia.org/wiki/Hill_cipher" target="_blank">Hill Cipher</a> algorithm. <a href="../../d6/d26/classciphers_1_1_hill_cipher.html#details">More...</a><br /></td></tr>
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<tr class="memitem:a3147ad576f8a94a2a6b66948672b452b"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d7/db9/hill__cipher_8cpp.html#a3147ad576f8a94a2a6b66948672b452b">test1</a> (const <a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a> &amp;text)</td></tr>
<tr class="memdesc:a3147ad576f8a94a2a6b66948672b452b"><td class="mdescLeft">&#160;</td><td class="mdescRight">Self test 1 - using 3x3 randomly generated key. <a href="../../d7/db9/hill__cipher_8cpp.html#a3147ad576f8a94a2a6b66948672b452b">More...</a><br /></td></tr>
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<tr class="memitem:ae66f6b31b5ad750f1fe042a706a4e3d4"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d7/db9/hill__cipher_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a> ()</td></tr>
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Variables</h2></td></tr>
<tr class="memitem:ab9aec0ccf4b6809f652bb540be87c216"><td class="memItemLeft" align="right" valign="top">static const char *&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d6/d4e/namespaceciphers.html#ab9aec0ccf4b6809f652bb540be87c216">ciphers::STRKEY</a></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/Hill_cipher">Hill cipher</a> algorithm. </p>
<p>Program to generate the encryption-decryption key and perform encryption and decryption of ASCII text using the famous block cipher algorithm. This is a powerful encryption algorithm that is relatively easy to implement with a given key. The strength of the algorithm depends on the size of the block encryption matrix key; the bigger the matrix, the stronger the encryption and more difficult to break it. However, the important requirement for the matrix is that:</p><ol type="1">
<div class="textblock"><p >Implementation of <a href="https://en.wikipedia.org/wiki/Hill_cipher" target="_blank">Hill cipher</a> algorithm. </p>
<p >Program to generate the encryption-decryption key and perform encryption and decryption of ASCII text using the famous block cipher algorithm. This is a powerful encryption algorithm that is relatively easy to implement with a given key. The strength of the algorithm depends on the size of the block encryption matrix key; the bigger the matrix, the stronger the encryption and more difficult to break it. However, the important requirement for the matrix is that:</p><ol type="1">
<li>matrix should be invertible - all inversion conditions should be satisfied and</li>
<li>its determinant must not have any common factors with the length of character set Due to this restriction, most implementations only implement with small 3x3 encryption keys and a small subset of ASCII alphabets.</li>
</ol>
<p>In the current implementation, I present to you an implementation for generating larger encryption keys (I have attempted upto 10x10) and an ASCII character set of 97 printable characters. Hence, a typical ASCII text file could be easily encrypted with the module. The larger character set increases the modulo of cipher and hence the matrix determinants can get very large very quickly rendering them ill-defined.</p>
<p >In the current implementation, I present to you an implementation for generating larger encryption keys (I have attempted upto 10x10) and an ASCII character set of 97 printable characters. Hence, a typical ASCII text file could be easily encrypted with the module. The larger character set increases the modulo of cipher and hence the matrix determinants can get very large very quickly rendering them ill-defined.</p>
<dl class="section note"><dt>Note</dt><dd>This program uses determinant computation using LU decomposition from the file lu_decomposition.h </dd>
<dd>
The matrix generation algorithm is very rudimentary and does not guarantee an invertible modulus matrix. </dd></dl>
<dl class="todo"><dt><b><a class="el" href="../../dd/da0/todo.html#_todo000001">Todo:</a></b></dt><dd>Better matrix generation algorithm.</dd></dl>
<dl class="section author"><dt>Author</dt><dd><a href="https://github.com/kvedala">Krishna Vedala</a> </dd></dl>
<dl class="section author"><dt>Author</dt><dd><a href="https://github.com/kvedala" target="_blank">Krishna Vedala</a> </dd></dl>
</div><h2 class="groupheader">Function Documentation</h2>
<a id="ae66f6b31b5ad750f1fe042a706a4e3d4"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#ae66f6b31b5ad750f1fe042a706a4e3d4">&#9670;&nbsp;</a></span>main()</h2>
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<p>Main function </p>
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<div class="line"><a name="l00538"></a><span class="lineno"> 538</span>&#160; </div>
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<p >Main function </p>
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<h2 class="memtitle"><span class="permalink"><a href="#a34bfcd756610834acac501f9eea1e2eb">&#9670;&nbsp;</a></span>operator&lt;&lt;()</h2>
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<p>operator to print a matrix </p>
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<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>&#160; </div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>&#160; <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> row = 0; row &lt; v.<a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector/size.html">size</a>(); row++) {</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>&#160; <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> col = 0; col &lt; v[row].<a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector/size.html">size</a>(); col++)</div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>&#160; out &lt;&lt; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/left.html">std::left</a> &lt;&lt; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/setw.html">std::setw</a>(width) &lt;&lt; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/setfill.html">std::setfill</a>(separator)</div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>&#160; &lt;&lt; v[row][col];</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>&#160; out &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="l00063"></a><span class="lineno"> 63</span>&#160; }</div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>&#160; </div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>&#160; <span class="keywordflow">return</span> out;</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>&#160;}</div>
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<div class="fragment"><div class="line"><a id="l00054" name="l00054"></a><span class="lineno"> 54</span> {</div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno"> 55</span> <span class="keyword">const</span> <span class="keywordtype">int</span> width = 15;</div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno"> 56</span> <span class="keyword">const</span> <span class="keywordtype">char</span> separator = <span class="charliteral">&#39; &#39;</span>;</div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno"> 57</span> </div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno"> 58</span> <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> row = 0; row &lt; v.<a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector/size.html">size</a>(); row++) {</div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno"> 59</span> <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> col = 0; col &lt; v[row].<a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector/size.html">size</a>(); col++)</div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno"> 60</span> out &lt;&lt; <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/left.html">std::left</a> &lt;&lt; <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/setw.html">std::setw</a>(width) &lt;&lt; <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/setfill.html">std::setfill</a>(separator)</div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno"> 61</span> &lt;&lt; v[row][col];</div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span> out &lt;&lt; <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno"> 63</span> }</div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span> </div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span> <span class="keywordflow">return</span> out;</div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span>}</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>
<div class="ttc" id="aleft_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/io/manip/left.html">std::left</a></div><div class="ttdeci">T left(T... args)</div></div>
<div class="ttc" id="asetfill_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/io/manip/setfill.html">std::setfill</a></div><div class="ttdeci">T setfill(T... args)</div></div>
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<h2 class="memtitle"><span class="permalink"><a href="#a3147ad576f8a94a2a6b66948672b452b">&#9670;&nbsp;</a></span>test1()</h2>
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@@ -293,37 +292,37 @@ Here is the call graph for this function:</div>
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<div class="fragment"><div class="line"><a name="l00470"></a><span class="lineno"> 470</span>&#160; {</div>
<div class="line"><a name="l00471"></a><span class="lineno"> 471</span>&#160; <span class="comment">// std::string text = &quot;Hello world!&quot;;</span></div>
<div class="line"><a name="l00472"></a><span class="lineno"> 472</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;======Test 1 (3x3 key) ======\nOriginal text:\n\t&quot;</span> &lt;&lt; text</div>
<div class="line"><a name="l00473"></a><span class="lineno"> 473</span>&#160; &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="l00474"></a><span class="lineno"> 474</span>&#160; </div>
<div class="line"><a name="l00475"></a><span class="lineno"> 475</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/utility/pair.html">std::pair&lt;matrix&lt;int&gt;</a>, <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">matrix&lt;int&gt;</a>&gt; p =</div>
<div class="line"><a name="l00476"></a><span class="lineno"> 476</span>&#160; <a class="code" href="../../d6/d26/classciphers_1_1_hill_cipher.html#a14bfcd14af6cd853130cbacd32e35c13">ciphers::HillCipher::generate_keys</a>(3, 0, 100);</div>
<div class="line"><a name="l00477"></a><span class="lineno"> 477</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">matrix&lt;int&gt;</a> ekey = p.first;</div>
<div class="line"><a name="l00478"></a><span class="lineno"> 478</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">matrix&lt;int&gt;</a> dkey = p.second;</div>
<div class="line"><a name="l00479"></a><span class="lineno"> 479</span>&#160; </div>
<div class="line"><a name="l00480"></a><span class="lineno"> 480</span>&#160; <span class="comment">// matrix&lt;int&gt; ekey = {{22, 28, 25}, {5, 26, 15}, {14, 18, 9}};</span></div>
<div class="line"><a name="l00481"></a><span class="lineno"> 481</span>&#160; <span class="comment">// std::cout &lt;&lt; &quot;Encryption key: \n&quot; &lt;&lt; ekey;</span></div>
<div class="line"><a name="l00482"></a><span class="lineno"> 482</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a> gibberish = <a class="code" href="../../d6/d26/classciphers_1_1_hill_cipher.html#aa8bbb6e4a5749f6008b06602d5103917">ciphers::HillCipher::encrypt_text</a>(text, ekey);</div>
<div class="line"><a name="l00483"></a><span class="lineno"> 483</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:\n\t&quot;</span> &lt;&lt; gibberish &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="l00484"></a><span class="lineno"> 484</span>&#160; </div>
<div class="line"><a name="l00485"></a><span class="lineno"> 485</span>&#160; <span class="comment">// matrix&lt;int&gt; dkey = ciphers::HillCipher::generate_decryption_key(ekey);</span></div>
<div class="line"><a name="l00486"></a><span class="lineno"> 486</span>&#160; <span class="comment">// std::cout &lt;&lt; &quot;Decryption key: \n&quot; &lt;&lt; dkey;</span></div>
<div class="line"><a name="l00487"></a><span class="lineno"> 487</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a> txt_back = <a class="code" href="../../d6/d26/classciphers_1_1_hill_cipher.html#a427acfac1dbff3f48a2b071d449d965b">ciphers::HillCipher::decrypt_text</a>(gibberish, dkey);</div>
<div class="line"><a name="l00488"></a><span class="lineno"> 488</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;Reconstruct text:\n\t&quot;</span> &lt;&lt; txt_back &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="l00489"></a><span class="lineno"> 489</span>&#160; </div>
<div class="line"><a name="l00490"></a><span class="lineno"> 490</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ofstream.html">std::ofstream</a> out_file(<span class="stringliteral">&quot;hill_cipher_test1.txt&quot;</span>);</div>
<div class="line"><a name="l00491"></a><span class="lineno"> 491</span>&#160; out_file &lt;&lt; <span class="stringliteral">&quot;Block size: &quot;</span> &lt;&lt; ekey.<a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector/size.html">size</a>() &lt;&lt; <span class="stringliteral">&quot;\n&quot;</span>;</div>
<div class="line"><a name="l00492"></a><span class="lineno"> 492</span>&#160; out_file &lt;&lt; <span class="stringliteral">&quot;Encryption Key:\n&quot;</span> &lt;&lt; ekey;</div>
<div class="line"><a name="l00493"></a><span class="lineno"> 493</span>&#160; out_file &lt;&lt; <span class="stringliteral">&quot;\nDecryption Key:\n&quot;</span> &lt;&lt; dkey;</div>
<div class="line"><a name="l00494"></a><span class="lineno"> 494</span>&#160; out_file.close();</div>
<div class="line"><a name="l00495"></a><span class="lineno"> 495</span>&#160; </div>
<div class="line"><a name="l00496"></a><span class="lineno"> 496</span>&#160; assert(txt_back == text);</div>
<div class="line"><a name="l00497"></a><span class="lineno"> 497</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;Passed :)\n&quot;</span>;</div>
<div class="line"><a name="l00498"></a><span class="lineno"> 498</span>&#160;}</div>
<div class="fragment"><div class="line"><a id="l00470" name="l00470"></a><span class="lineno"> 470</span> {</div>
<div class="line"><a id="l00471" name="l00471"></a><span class="lineno"> 471</span> <span class="comment">// std::string text = &quot;Hello world!&quot;;</span></div>
<div class="line"><a id="l00472" name="l00472"></a><span class="lineno"> 472</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot;======Test 1 (3x3 key) ======\nOriginal text:\n\t&quot;</span> &lt;&lt; text</div>
<div class="line"><a id="l00473" name="l00473"></a><span class="lineno"> 473</span> &lt;&lt; <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
<div class="line"><a id="l00474" name="l00474"></a><span class="lineno"> 474</span> </div>
<div class="line"><a id="l00475" name="l00475"></a><span class="lineno"> 475</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/utility/pair.html">std::pair&lt;matrix&lt;int&gt;</a>, <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">matrix&lt;int&gt;</a>&gt; p =</div>
<div class="line"><a id="l00476" name="l00476"></a><span class="lineno"> 476</span> <a class="code hl_function" href="../../d6/d26/classciphers_1_1_hill_cipher.html#a405b0a28d66a61239d3565d5256f9cb5">ciphers::HillCipher::generate_keys</a>(3, 0, 100);</div>
<div class="line"><a id="l00477" name="l00477"></a><span class="lineno"> 477</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">matrix&lt;int&gt;</a> ekey = p.first;</div>
<div class="line"><a id="l00478" name="l00478"></a><span class="lineno"> 478</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">matrix&lt;int&gt;</a> dkey = p.second;</div>
<div class="line"><a id="l00479" name="l00479"></a><span class="lineno"> 479</span> </div>
<div class="line"><a id="l00480" name="l00480"></a><span class="lineno"> 480</span> <span class="comment">// matrix&lt;int&gt; ekey = {{22, 28, 25}, {5, 26, 15}, {14, 18, 9}};</span></div>
<div class="line"><a id="l00481" name="l00481"></a><span class="lineno"> 481</span> <span class="comment">// std::cout &lt;&lt; &quot;Encryption key: \n&quot; &lt;&lt; ekey;</span></div>
<div class="line"><a id="l00482" name="l00482"></a><span class="lineno"> 482</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a> gibberish = <a class="code hl_function" href="../../d6/d26/classciphers_1_1_hill_cipher.html#aa8bbb6e4a5749f6008b06602d5103917">ciphers::HillCipher::encrypt_text</a>(text, ekey);</div>
<div class="line"><a id="l00483" name="l00483"></a><span class="lineno"> 483</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot;Encrypted text:\n\t&quot;</span> &lt;&lt; gibberish &lt;&lt; <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
<div class="line"><a id="l00484" name="l00484"></a><span class="lineno"> 484</span> </div>
<div class="line"><a id="l00485" name="l00485"></a><span class="lineno"> 485</span> <span class="comment">// matrix&lt;int&gt; dkey = ciphers::HillCipher::generate_decryption_key(ekey);</span></div>
<div class="line"><a id="l00486" name="l00486"></a><span class="lineno"> 486</span> <span class="comment">// std::cout &lt;&lt; &quot;Decryption key: \n&quot; &lt;&lt; dkey;</span></div>
<div class="line"><a id="l00487" name="l00487"></a><span class="lineno"> 487</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a> txt_back = <a class="code hl_function" href="../../d6/d26/classciphers_1_1_hill_cipher.html#a427acfac1dbff3f48a2b071d449d965b">ciphers::HillCipher::decrypt_text</a>(gibberish, dkey);</div>
<div class="line"><a id="l00488" name="l00488"></a><span class="lineno"> 488</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot;Reconstruct text:\n\t&quot;</span> &lt;&lt; txt_back &lt;&lt; <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
<div class="line"><a id="l00489" name="l00489"></a><span class="lineno"> 489</span> </div>
<div class="line"><a id="l00490" name="l00490"></a><span class="lineno"> 490</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ofstream.html">std::ofstream</a> out_file(<span class="stringliteral">&quot;hill_cipher_test1.txt&quot;</span>);</div>
<div class="line"><a id="l00491" name="l00491"></a><span class="lineno"> 491</span> out_file &lt;&lt; <span class="stringliteral">&quot;Block size: &quot;</span> &lt;&lt; ekey.<a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector/size.html">size</a>() &lt;&lt; <span class="stringliteral">&quot;\n&quot;</span>;</div>
<div class="line"><a id="l00492" name="l00492"></a><span class="lineno"> 492</span> out_file &lt;&lt; <span class="stringliteral">&quot;Encryption Key:\n&quot;</span> &lt;&lt; ekey;</div>
<div class="line"><a id="l00493" name="l00493"></a><span class="lineno"> 493</span> out_file &lt;&lt; <span class="stringliteral">&quot;\nDecryption Key:\n&quot;</span> &lt;&lt; dkey;</div>
<div class="line"><a id="l00494" name="l00494"></a><span class="lineno"> 494</span> out_file.close();</div>
<div class="line"><a id="l00495" name="l00495"></a><span class="lineno"> 495</span> </div>
<div class="line"><a id="l00496" name="l00496"></a><span class="lineno"> 496</span> assert(txt_back == text);</div>
<div class="line"><a id="l00497" name="l00497"></a><span class="lineno"> 497</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot;Passed :)\n&quot;</span>;</div>
<div class="line"><a id="l00498" name="l00498"></a><span class="lineno"> 498</span>}</div>
<div class="ttc" id="abasic_ofstream_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/io/basic_ofstream.html">std::ofstream</a></div></div>
<div class="ttc" id="aclassciphers_1_1_hill_cipher_html_a14bfcd14af6cd853130cbacd32e35c13"><div class="ttname"><a href="../../d6/d26/classciphers_1_1_hill_cipher.html#a14bfcd14af6cd853130cbacd32e35c13">ciphers::HillCipher::generate_keys</a></div><div class="ttdeci">static std::pair&lt; matrix&lt; int &gt;, matrix&lt; int &gt; &gt; generate_keys(size_t size, int limit1=0, int limit2=10)</div><div class="ttdoc">Generate encryption and decryption key pair.</div><div class="ttdef"><b>Definition:</b> hill_cipher.cpp:424</div></div>
<div class="ttc" id="aclassciphers_1_1_hill_cipher_html_a405b0a28d66a61239d3565d5256f9cb5"><div class="ttname"><a href="../../d6/d26/classciphers_1_1_hill_cipher.html#a405b0a28d66a61239d3565d5256f9cb5">ciphers::HillCipher::generate_keys</a></div><div class="ttdeci">static std::pair&lt; matrix&lt; int &gt;, matrix&lt; int &gt; &gt; generate_keys(size_t size, int limit1=0, int limit2=10)</div><div class="ttdoc">Generate encryption and decryption key pair.</div><div class="ttdef"><b>Definition:</b> hill_cipher.cpp:424</div></div>
<div class="ttc" id="aclassciphers_1_1_hill_cipher_html_a427acfac1dbff3f48a2b071d449d965b"><div class="ttname"><a href="../../d6/d26/classciphers_1_1_hill_cipher.html#a427acfac1dbff3f48a2b071d449d965b">ciphers::HillCipher::decrypt_text</a></div><div class="ttdeci">static const std::string decrypt_text(const std::string &amp;text, const matrix&lt; int &gt; &amp;decrypt_key)</div><div class="ttdoc">Decrypt a given text using a given key.</div><div class="ttdef"><b>Definition:</b> hill_cipher.cpp:457</div></div>
<div class="ttc" id="aclassciphers_1_1_hill_cipher_html_aa8bbb6e4a5749f6008b06602d5103917"><div class="ttname"><a href="../../d6/d26/classciphers_1_1_hill_cipher.html#aa8bbb6e4a5749f6008b06602d5103917">ciphers::HillCipher::encrypt_text</a></div><div class="ttdeci">static const std::string encrypt_text(const std::string &amp;text, const matrix&lt; int &gt; &amp;encrypt_key)</div><div class="ttdoc">Encrypt a given text using a given key.</div><div class="ttdef"><b>Definition:</b> hill_cipher.cpp:445</div></div>
<div class="ttc" id="apair_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/utility/pair.html">std::pair</a></div></div>
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<h2 class="memtitle"><span class="permalink"><a href="#a04391124480d2a49f2dec900237b0712">&#9670;&nbsp;</a></span>test2()</h2>
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<div class="fragment"><div class="line"><a name="l00505"></a><span class="lineno"> 505</span>&#160; {</div>
<div class="line"><a name="l00506"></a><span class="lineno"> 506</span>&#160; <span class="comment">// std::string text = &quot;Hello world!&quot;;</span></div>
<div class="line"><a name="l00507"></a><span class="lineno"> 507</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;======Test 2 (8x8 key) ======\nOriginal text:\n\t&quot;</span> &lt;&lt; text</div>
<div class="line"><a name="l00508"></a><span class="lineno"> 508</span>&#160; &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="l00509"></a><span class="lineno"> 509</span>&#160; </div>
<div class="line"><a name="l00510"></a><span class="lineno"> 510</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/utility/pair.html">std::pair&lt;matrix&lt;int&gt;</a>, <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">matrix&lt;int&gt;</a>&gt; p =</div>
<div class="line"><a name="l00511"></a><span class="lineno"> 511</span>&#160; <a class="code" href="../../d6/d26/classciphers_1_1_hill_cipher.html#a14bfcd14af6cd853130cbacd32e35c13">ciphers::HillCipher::generate_keys</a>(8, 0, 3);</div>
<div class="line"><a name="l00512"></a><span class="lineno"> 512</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">matrix&lt;int&gt;</a> ekey = p.first;</div>
<div class="line"><a name="l00513"></a><span class="lineno"> 513</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">matrix&lt;int&gt;</a> dkey = p.second;</div>
<div class="line"><a name="l00514"></a><span class="lineno"> 514</span>&#160; </div>
<div class="line"><a name="l00515"></a><span class="lineno"> 515</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a> gibberish = <a class="code" href="../../d6/d26/classciphers_1_1_hill_cipher.html#aa8bbb6e4a5749f6008b06602d5103917">ciphers::HillCipher::encrypt_text</a>(text, ekey);</div>
<div class="line"><a name="l00516"></a><span class="lineno"> 516</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:\n\t&quot;</span> &lt;&lt; gibberish &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="l00517"></a><span class="lineno"> 517</span>&#160; </div>
<div class="line"><a name="l00518"></a><span class="lineno"> 518</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a> txt_back = <a class="code" href="../../d6/d26/classciphers_1_1_hill_cipher.html#a427acfac1dbff3f48a2b071d449d965b">ciphers::HillCipher::decrypt_text</a>(gibberish, dkey);</div>
<div class="line"><a name="l00519"></a><span class="lineno"> 519</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;Reconstruct text:\n\t&quot;</span> &lt;&lt; txt_back &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="l00520"></a><span class="lineno"> 520</span>&#160; </div>
<div class="line"><a name="l00521"></a><span class="lineno"> 521</span>&#160; <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ofstream.html">std::ofstream</a> out_file(<span class="stringliteral">&quot;hill_cipher_test2.txt&quot;</span>);</div>
<div class="line"><a name="l00522"></a><span class="lineno"> 522</span>&#160; out_file &lt;&lt; <span class="stringliteral">&quot;Block size: &quot;</span> &lt;&lt; ekey.<a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector/size.html">size</a>() &lt;&lt; <span class="stringliteral">&quot;\n&quot;</span>;</div>
<div class="line"><a name="l00523"></a><span class="lineno"> 523</span>&#160; out_file &lt;&lt; <span class="stringliteral">&quot;Encryption Key:\n&quot;</span> &lt;&lt; ekey;</div>
<div class="line"><a name="l00524"></a><span class="lineno"> 524</span>&#160; out_file &lt;&lt; <span class="stringliteral">&quot;\nDecryption Key:\n&quot;</span> &lt;&lt; dkey;</div>
<div class="line"><a name="l00525"></a><span class="lineno"> 525</span>&#160; out_file.close();</div>
<div class="line"><a name="l00526"></a><span class="lineno"> 526</span>&#160; </div>
<div class="line"><a name="l00527"></a><span class="lineno"> 527</span>&#160; assert(txt_back.<a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/string/basic_string/compare.html">compare</a>(0, text.<a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/string/basic_string/size.html">size</a>(), text) == 0);</div>
<div class="line"><a name="l00528"></a><span class="lineno"> 528</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;Passed :)\n&quot;</span>;</div>
<div class="line"><a name="l00529"></a><span class="lineno"> 529</span>&#160;}</div>
<div class="fragment"><div class="line"><a id="l00505" name="l00505"></a><span class="lineno"> 505</span> {</div>
<div class="line"><a id="l00506" name="l00506"></a><span class="lineno"> 506</span> <span class="comment">// std::string text = &quot;Hello world!&quot;;</span></div>
<div class="line"><a id="l00507" name="l00507"></a><span class="lineno"> 507</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot;======Test 2 (8x8 key) ======\nOriginal text:\n\t&quot;</span> &lt;&lt; text</div>
<div class="line"><a id="l00508" name="l00508"></a><span class="lineno"> 508</span> &lt;&lt; <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
<div class="line"><a id="l00509" name="l00509"></a><span class="lineno"> 509</span> </div>
<div class="line"><a id="l00510" name="l00510"></a><span class="lineno"> 510</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/utility/pair.html">std::pair&lt;matrix&lt;int&gt;</a>, <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">matrix&lt;int&gt;</a>&gt; p =</div>
<div class="line"><a id="l00511" name="l00511"></a><span class="lineno"> 511</span> <a class="code hl_function" href="../../d6/d26/classciphers_1_1_hill_cipher.html#a405b0a28d66a61239d3565d5256f9cb5">ciphers::HillCipher::generate_keys</a>(8, 0, 3);</div>
<div class="line"><a id="l00512" name="l00512"></a><span class="lineno"> 512</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">matrix&lt;int&gt;</a> ekey = p.first;</div>
<div class="line"><a id="l00513" name="l00513"></a><span class="lineno"> 513</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">matrix&lt;int&gt;</a> dkey = p.second;</div>
<div class="line"><a id="l00514" name="l00514"></a><span class="lineno"> 514</span> </div>
<div class="line"><a id="l00515" name="l00515"></a><span class="lineno"> 515</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a> gibberish = <a class="code hl_function" href="../../d6/d26/classciphers_1_1_hill_cipher.html#aa8bbb6e4a5749f6008b06602d5103917">ciphers::HillCipher::encrypt_text</a>(text, ekey);</div>
<div class="line"><a id="l00516" name="l00516"></a><span class="lineno"> 516</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot;Encrypted text:\n\t&quot;</span> &lt;&lt; gibberish &lt;&lt; <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
<div class="line"><a id="l00517" name="l00517"></a><span class="lineno"> 517</span> </div>
<div class="line"><a id="l00518" name="l00518"></a><span class="lineno"> 518</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a> txt_back = <a class="code hl_function" href="../../d6/d26/classciphers_1_1_hill_cipher.html#a427acfac1dbff3f48a2b071d449d965b">ciphers::HillCipher::decrypt_text</a>(gibberish, dkey);</div>
<div class="line"><a id="l00519" name="l00519"></a><span class="lineno"> 519</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot;Reconstruct text:\n\t&quot;</span> &lt;&lt; txt_back &lt;&lt; <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
<div class="line"><a id="l00520" name="l00520"></a><span class="lineno"> 520</span> </div>
<div class="line"><a id="l00521" name="l00521"></a><span class="lineno"> 521</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ofstream.html">std::ofstream</a> out_file(<span class="stringliteral">&quot;hill_cipher_test2.txt&quot;</span>);</div>
<div class="line"><a id="l00522" name="l00522"></a><span class="lineno"> 522</span> out_file &lt;&lt; <span class="stringliteral">&quot;Block size: &quot;</span> &lt;&lt; ekey.<a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector/size.html">size</a>() &lt;&lt; <span class="stringliteral">&quot;\n&quot;</span>;</div>
<div class="line"><a id="l00523" name="l00523"></a><span class="lineno"> 523</span> out_file &lt;&lt; <span class="stringliteral">&quot;Encryption Key:\n&quot;</span> &lt;&lt; ekey;</div>
<div class="line"><a id="l00524" name="l00524"></a><span class="lineno"> 524</span> out_file &lt;&lt; <span class="stringliteral">&quot;\nDecryption Key:\n&quot;</span> &lt;&lt; dkey;</div>
<div class="line"><a id="l00525" name="l00525"></a><span class="lineno"> 525</span> out_file.close();</div>
<div class="line"><a id="l00526" name="l00526"></a><span class="lineno"> 526</span> </div>
<div class="line"><a id="l00527" name="l00527"></a><span class="lineno"> 527</span> assert(txt_back.<a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/string/basic_string/compare.html">compare</a>(0, text.<a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/string/basic_string/size.html">size</a>(), text) == 0);</div>
<div class="line"><a id="l00528" name="l00528"></a><span class="lineno"> 528</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot;Passed :)\n&quot;</span>;</div>
<div class="line"><a id="l00529" name="l00529"></a><span class="lineno"> 529</span>}</div>
<div class="ttc" id="acompare_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/string/basic_string/compare.html">std::string::compare</a></div><div class="ttdeci">T compare(T... args)</div></div>
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