<div dir="ltr"><div class="gmail_extra"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">If you use such a system, I think you've clearly signaled that you<br>
don't trust me. I wouldn't chat with you and in fact, I didn't sign<br>
this email. :)<br></blockquote><div><br></div><div>Sure about that? ;) You sent it via Gmail which signed it using DKIM as coming from your account. To deny you sent it, you would have to either claim your account was hacked or that Google is trying to forge evidence.</div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">End point security is rather weak and so I'd wager that you're aiming<br>
to design a protocol "feature" that will be fantastic for framing<br>
someone.</blockquote><div><br></div><div>If you read the newspaper story I linked to from the first email, it was the opposite - the guy was being framed and was able to prove it using text message evidence, which wasn't deniable presumably due to records kept by the carrier (there was CCTV evidence as well anyway). I think being able to prove someone said something cuts both ways.</div></div></div></div>