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Common Authentication Technology Next Generation (kitten)

Name: Common Authentication Technology Next Generation
Area:Security Area (sec)
State: Active
Charter: charter-ietf-kitten-08 (Approved)
Chairs: Matthew Miller <>
Benjamin Kaduk <>
Area Director: Stephen Farrell <>
Secretary: Simon Josefsson <>
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Charter for Working Group

The purpose of the Common Authentication Technology Next Generation
(Kitten) working group (WG) is to develop extensions/improvements to the
GSS-API and to the Kerberos authentication system, shepherd specific
GSS-API security mechanisms, and provide guidance for any new
SASL-related submissions.

This charter combines the work of the Kerberos WG and the kitten WG
(under the aegis of the kitten WG). In places, it identifies which WG
was previously home for that work.

The working group will develop extensions and/or updates to the GSS-API,
working on specific items regarding credential management, replay cache
avoidance, error reporting, and supporting stateless and/or distributed

The working group will also maintain and improve upon the Kerberos
protocol, working on items regarding internationalization considering
alignment with the precis work, new initial authentication types,
authorization framework/data, replay cache avoidance, cryptography
advances, interop with 3rd party authentication, and identity

In detail, both existing and new work items include:

Existing Working Group Items
SASL Mechanism for OAuth (draft-ietf-kitten-sasl-oauth)
SASL Mechansim for SAML-EC (draft-ietf-kitten-sasl-saml-ec)
GSS-API IANA Registry (draft-ietf-kitten-gssapi-extensions-iana)
KDC Model (draft-ietf-krb-wg-kdc-model)
PKINIT Hash Agility (draft-ietf-krb-wg-pkinit-alg-agility)
Kerberos IANA Registry (draft-ietf-kitten-kerberos-iana-registries)
Initial and Pass Through Authentication in Kerberos 5 (draft-ietf-krb-wg-iakerb)
Unencrypted Portion of Ticket Extensions (draft-ietf-krb-wg-ticket-extensions)

GSS-API Related
Provide new interfaces for credential management, which include the
initializing credentials
iterating credentials
exporting/importing credentials

Negotiable replay cache avoidance

Define interfaces for better error message reporting.

Specify an option for exporting partially-established security
contexts and possibly a utility function for exporting security
contexts in an encrypted form, as well as a corresponding utility
function to decrypt and import such security context tokens.

Specify one-time password / two-factor authentication needs for SASL
applications. This could be achieved through an explicit new
GSS-API/SASL mechanism (e.g., or if
the consensus is that due to usability reasons, it is preferable
to do OTP/2FA through an higher level protocol
(Kerberos/OpenID/SAML/SAML20EC/EAP?) then prepare a document
explaining the usability problem and provide pointers for

Kerberos Related

Prepare, review, and advance standards-track and informational
specifications defining new authorization data types for carrying
supplemental information about the client to which a Kerberos
ticket has been issued and/or restrictions on what the ticket can
be used for. To enhance this ongoing authorization data work, a
container format supporting the use cases of draft-ietf-krb-wg-pad
may be standardized.

Prepare a standards-track protocol to solve the use cases addressed
by draft-hotz-kx509-01 including new support for digital

Today Kerberos requires a replay cache to be used in AP exchanges in
almost all cases. Replay caches are quite complex to implement
correctly, particularly in clustered systems. High-performance
replay caches are even more difficult to implement. The WG will
pursue extensions to minimize the need for replay caching,
optimize replay caching, and/or elide the need for replay caching.

Prepare, review, and advance standards-track and informational
specifications defining use of new cryptographic algorithms in the
Kerberos protocol using the RFC3961 framework, on an ongoing
basis. Cryptographic algorithms intended for standards track
status must be of good quality, have broad international support,
and fill a definite need.

Prepare, review, and advance standards-track and informational
specifications of new pre-authentication types for the Kerberos
protocol, on an ongoing basis.

Prepare, review, and advance standards track updates and extensions to
RFC4121, as needed and on an ongoing basis.


Mar 2013
draft-ietf-krb-wg-pkinit-alg-agility to IESG
Mar 2013
draft-ietf-kitten-sasl-oauth to IESG
Apr 2013
draft-ietf-krb-wg-iakerb to IESG
Apr 2013
draft-ietf-kitten-sasl-saml-ec to IESG
May 2013
draft-ietf-kitten-gssapi-extensions-iana to IESG
May 2013
draft-ietf-krb-wg-cammac to IESG
Jun 2013
draft-ietf-kitten-kerberos-iana-registries to IESG
Jun 2013
draft-ietf-krb-wg-pad to IESG
Jul 2013
Adopt work on one or more items for GSS-API cred management
Jul 2013
Adopt work on better error reporting in the GSS-API
Aug 2013
Adopt work on exporting partially-established GSS-API contexts
Aug 2013
draft-ietf-krb-wg-ticket-extensions to IESG
Sep 2013
Adopt work on the GSS-API for replay cache avoidance