SPAKE Pre-Authentication

The information below is for an old version of the document
Document Type Expired Internet-Draft (kitten WG)
Last updated 2018-08-14 (latest revision 2018-02-10)
Replaces draft-mccallum-kitten-krb-spake-preauth
Stream IETF
Intended RFC status (None)
Expired & archived
pdf htmlized bibtex
Stream WG state WG Document
Document shepherd No shepherd assigned
IESG IESG state Expired
Consensus Boilerplate Unknown
Telechat date
Responsible AD (None)
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This document defines a new pre-authentication mechanism for the Kerberos protocol that uses a password authenticated key exchange. This document has three goals. First, increase the security of Kerberos pre-authentication exchanges by making offline brute-force attacks infeasible. Second, enable the use of second factor authentication without relying on FAST. This is achieved using the existing trust relationship established by the shared first factor. Third, make Kerberos pre-authentication more resilient against time synchronization errors by removing the need to transfer an encrypted timestamp from the client.


Nathaniel McCallum (
Simo Sorce (
Robbie Harwood (
Greg Hudson (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)