AS4 (Applicability Statement 4) provides guidance for a standardized methodology for the secure and document-agnostic exchange of B2B payloads using Web services. By constraining the ebMS v3.0 specification and the underlying WS-* specifications for messaging packaging, transport, security and business non-repudiation, the profile focuses on providing an entry-level on-ramp for Web services B2B messaging. The end goal of this profile development is to replicate and strategically extend the existing functional requirements currently satisfied by RFC4130 (AS2) by mapping those requirements onto the Web services platform.
The AS4: Secure B2B Document Exchange Using Web Services standard was developed by a subcommittee of the OASIS ebXML Messaging Services Technical Committee. The intent and purpose of the AS4 subcommittee was the development of a Conformance Profile of the ebms v3.0 specification.
To join the AS4 subcommittee at OASIS, go to: http://www.oasis-open.org/committees/tc_home.php?wg_abbrev=ebxml-msg-as4