Atom Authentication

I've written up a replacement for the authentication section of the Atom protocol: http://intertwingly.net/wiki/pie/PaceAuthentication. It's simple but unusable by servers in restricted hosting situationstypical of Movable Type and Blosxom blogs; I hope this serves asprovocation for someone on that side to nail down an alternativeauthentication scheme.  But even if not, at least everyone elsewill have a minimal fallback for authentication.

Note that the proposal also allows servers to require authenticationfor comments -- something that would be a helpful building block infighting comment spam.