<HTML><BODY style="word-wrap: break-word; -khtml-nbsp-mode: space; -khtml-line-break: after-white-space; ">I have a user bugging me about this, and I'm not sure how to respond.<DIV><BR class="khtml-block-placeholder"></DIV><DIV>The problem: some services support serverside offline messaging. Yahoo and ICQ, for example. If Bob is in an encrypted conversation with Alice, and Alice signs offline, the service still allows Bob to message Alice, storing the (encrypted) message on the server for delivery when Alice next signs online. Bob knows that Alice has the information for decrypting his message, since they've been communicating previously...</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>So Alice signs on a day later... but she can't read the message, since the conversation has since ended. She receives:</DIV><DIV><B>The encrypted message received from Bob is unreadable, as you are not currently communicating privately.</B></DIV><DIV><B><BR class="khtml-block-placeholder"></B></DIV><DIV>Any thoughts?</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>-Evan</DIV></BODY></HTML>