Skip to main content

SPAKE Pre-Authentication

Document Type Replaced Internet-Draft (individual)
Expired & archived
Authors Nathaniel McCallum , Simo Sorce , Robbie Harwood , Greg Hudson
Last updated 2016-12-12
Replaced by draft-ietf-kitten-krb-spake-preauth
RFC stream (None)
Intended RFC status (None)
Stream Stream state (No stream defined)
Consensus boilerplate Unknown
RFC Editor Note (None)
IESG IESG state Replaced by draft-ietf-kitten-krb-spake-preauth
Telechat date (None)
Responsible AD (None)
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft is available in these formats:


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 secure second factor authentication without relying on FAST. This is achived 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.)