Crypt private messages - wich can't be read by server owner / developer
<p>Iam not sure if this is the right place but lets see. </p>

<p>Iam developing an system to send private messages from one user to an other use. Under the hood runs PHP 5.2.x .</p>

<p>Now iam looking for any way to crypt private messages in a way that <strong>i cant access them</strong>. In the moment i have no idea how to realize such a system, where iam not knowing the encryption key.</p>

<p>My first idea was to combine it with something like OAuth. </p>

<p>Some more requirements to clarify the problem:</p>

<ul>
<li>Public Webpage</li>
<li>good usability</li>
</ul>
