[Sipping] New I-D on Digest AKA authenticaton

Hi All,

We have written an extension to Digest authentication enabling its use 
in 3GPP IMS. The draft defines a mechanism, in which the UMTS 
Authentication and Key Agreement (AKA) protocol is used for generating 
Digest passwords. Overall, Digest operation has been preserved, with 
some added semantics and parameters.

The I-D can be fetched from:
http://www.ietf.org/internet-drafts/draft-niemi-sipping-digest-aka-00.txt

Requirements for the work are discussed in:
http://www.ietf.org/internet-drafts/draft-uusitalo-sipping-authentication-00.txt
http://www.ietf.org/internet-drafts/draft-garcia-sipping-3gpp-reqs-02.txt

The aim with this document is to have a SIP WG work item for it, and 
progress the document to standards track RFC. Note, that this work is in 
some sense continuing the SIP EAP work, but with a more well defined 
scope based on the feedback from the Transport AD's and various other 
experts in the field.

Comments are appreciated.

Thanks,
Aki

---
Abstract

    The Hypertext Transfer Protocol (HTTP) Authentication Framework
    includes two authentication schemes: Basic and Digest.  Both schemes
    employ a shared secret based mechanism for access authentication.
    The Authentication and Key Agreement (AKA) mechanism performs user
    authentication and session key distribution in Universal Mobile
    Telecommunications System (UMTS) networks.  AKA is a challenge-
    response based mechanism that uses symmetric cryptography.  This memo
    specifies an AKA based password generation mechanism for HTTP Digest
    access authentication.

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