Short Authentication Strings for TLS

Document Type Expired Internet-Draft (individual)
Authors Ian Miers , Matthew Green  , Eric Rescorla 
Last updated 2014-08-18 (latest revision 2014-02-14)
Stream (None)
Expired & archived
plain text xml pdf htmlized bibtex
Stream Stream state (No stream defined)
Consensus Boilerplate Unknown
RFC Editor Note (None)
IESG IESG state Expired
Telechat date
Responsible AD (None)
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


TLS and DTLS connections generally rely on a PKI, a shared secret, or endpoint fingerprints for endpoint authentication. This document describes an authentication mechanism which instead generates a "short authentication string" (SAS) as an emergent property of the connection. The SAS can then be verified via an external channel in order to authenticate the connection.


Ian Miers (
Matthew Green (
Eric Rescorla (

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