n>
<span class="nv">$key</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">encryption</span><span class="o">-&gt;</span><span class="na">create_key</span><span class="p">(</span><span class="mi">16</span><span class="p">);</span>
</pre></div>
</div>
<p>The key can be either stored in your <em>application/config/config.php</em>, or
you can design your own storage mechanism and pass the key dynamically
when encrypting/decrypting.</p>
<p>To save your key 