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Extension for protecting (D)TLS handshakes against Denial of Service

Document Type Expired Internet-Draft (individual)
Expired & archived
Authors Marco Tiloca , Ludwig Seitz , Maarten Hoeve , Olaf Bergmann
Last updated 2018-09-06 (Latest revision 2018-03-05)
RFC stream (None)
Intended RFC status (None)
Stream Stream state (No stream defined)
Consensus boilerplate Unknown
RFC Editor Note (None)
IESG IESG state Expired
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This Internet-Draft is no longer active.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 describes an extension for TLS and DTLS to protect the server from Denial of Service attacks against the handshake protocol, carried out by an on-path adversary. The extension includes a nonce and a Message Authentication Code (MAC) over that nonce, encoded as a Handshake Token that a Trust Anchor entity computes and provides to the client. The server registered at the Trust Anchor verifies the MAC to determine whether continuing or aborting the handshake.


Marco Tiloca
Ludwig Seitz
Maarten Hoeve
Olaf Bergmann

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