SPAKE Pre-Authentication

Document Type Replaced Internet-Draft (individual)
Last updated 2016-12-12
Replaced by draft-ietf-kitten-krb-spake-preauth
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Intended RFC status (None)
Expired & archived
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IESG IESG state Replaced by draft-ietf-kitten-krb-spake-preauth
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This Internet-Draft is no longer active.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 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.)