> From: John C Klensin <john-ietf@xxxxxxx> > After looking through the agenda and thinking about end to end > confidentiality mechanisms, a few questions/suggestions: The recent news reports that I have seen are that the NSA's pervasive monitoring focuses on "metatada", "who is talking to whom". And the trouble with end-to-end confidentiality mechanisms is that they do not hide the destination address; indeed they can't. And it seems to me that almost no confidentiality systems have been focused on confidentiality of message destinations. So I think some thought needs to be put into what can be done to thwart pervasive monitoring when the information to be concealed is the identity of the endpoints. Dale