Version 0.6 of XEP-0220 (Server Dialback) has been released. Abstract: This specification defines the Server Dialback protocol, which is used between XMPP servers to provide identity verification. Server Dialback uses the Domain Name System (DNS) as the basis for verifying identity; the basic approach is that when a receiving server accepts a server-to-server connection from an originating server, it does not process traffic over the connection until it has verified a key with an authoritative server for the domain asserted by the originating server. Although Server Dialback does not provide strong authentication or trusted federation and although it is subject to DNS poisoning attacks, it has effectively prevented most instances of address spoofing on the XMPP network since its development in the year 2000.
Changelog: Updated to reflect RFC 6120; mandated support for stream feature in XMPP 1.0 implementations; removed requirement for the Receiving Server to close the stream if the dialback key is invalid, since the stream might be used for multiple domain pairs. (psa) Diff: http://xmpp.org/extensions/diff/api/xep/0220/diff/0.5/vs/0.6 URL: http://xmpp.org/extensions/xep-0220.html
