<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">Under the hood there would be a bunch of shamir's secret sharing and key<br>
wrapping palaver to actually make things go.<br></blockquote><div><br></div><div>You mean like wrapping the user's kB with their own kA (prove ownership of your account) plus your friend's kB (prove non-resetness of their account)? Yeah, that's a dance, but it could work :)</div></div></div></div>