I think the server &quot;wall concept&quot; is easy, the client or ease of use is the real problem. it&#x27;s not hard to keep encrypting until everything is &quot;ttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttt&quot; that for example could be hi to one person and goodbye to another even though they are all the same letter, the problem is always in keys or the need for them&#x2F;transferring.