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Using Client Puzzles to Protect TLS Servers From Denial of Service Attacks

Document Type Expired Internet-Draft (individual)
Expired & archived
Author Yoav Nir
Last updated 2014-11-10 (Latest revision 2014-04-30)
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This Internet-Draft is no longer active.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 proposes a mechanism for mitigating denial of service (DoS) and distributed denial of service (DDoS) attacks on TLS servers. Attackers are limited in their ability to cause resource waste on the server by requiring proof of work by the client before these CPU resources are expended.


Yoav Nir

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