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    <p>The simplest practical form is an <a href="http://en.wikipedia.org/wiki/XOR_cipher">XOR cipher</a>. Basically you generate an encryption/decryption key of random numbers, of any length. To encrypt or decrypt your data, XOR the data with the key.</p> <p>It is not very secure; it's mostly just used to do a light obfuscation.</p> <pre><code>#include &lt;vector&gt; typedef unsigned __int8 BYTE; std::vector&lt;BYTE&gt; xor_encryptdecrypt(const std::vector&lt;BYTE&gt;&amp; encryptionKey, const std::vector&lt;BYTE&gt;&amp; input) { std::vector&lt;BYTE&gt; ret; ret.reserve(input.size()); std::vector&lt;BYTE&gt;::const_iterator keyIterator = encryptionKey.begin(); for(std::vector&lt;BYTE&gt;::const_iterator inputIterator = input.begin(); inputIterator != input.end(); ++ inputIterator) { ret.push_back(*inputIterator ^ *keyIterator); // advance the key iterator, wrapping to begin. if(++ keyIterator == encryptionKey.end()) keyIterator = encryptionKey.begin(); } return ret; } int main() { // variable-length key of randomness, used for both encryption and decryption. std::vector&lt;BYTE&gt; key; key.push_back(0x55); key.push_back(0xae); key.push_back(0x8c); key.push_back(0x14); std::vector&lt;BYTE&gt; input; input.push_back(0x00); input.push_back(0x01); input.push_back(0x02); input.push_back(0x03); input.push_back(0x04); input.push_back(0x05); // encrypt std::vector&lt;BYTE&gt; encrypted = xor_encryptdecrypt(key, input); // decrypt std::vector&lt;BYTE&gt; decrypted = xor_encryptdecrypt(key, encrypted); return 0; } </code></pre>
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