A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Multicast Security Working Group of the IETF.
Title : TESLA: Multicast Source Authentication
Transform Introduction
Author(s) : A. Perrig, et al.
Filename : draft-ietf-msec-tesla-intro-03.txt
Pages : 13
Date : 2004-8-16
Data authentication is an important component for many applications,
for example audio and video Internet broadcasts, or data distribution
by satellite. This document introduces TESLA, a secure source
authentication mechanism for multicast or broadcast data streams. This
document provides an algorithmic description of the scheme for
informational purposes, and in particular, it is intended to assist
in writing standardizable and secure specifications for protocols
based on TESLA in different contexts.
The main deterrents so far for a data authentication mechanism for
multicast were the seemingly conflicting requirements: loss tolerance,
high efficiency, no per-receiver state at the sender. The problem
is particularly hard in settings with high packet loss rates and
where lost packets are not retransmitted, and where the receiver
wants to authenticate each packet it receives.
TESLA provides authentication of individual data packets, regardless
of the packet loss rate. In addition, TESLA features low overhead for
both sender and receiver, and does not require per-receiver state at
the sender. TESLA is secure as long as the sender and receiver are
loosely time synchronized.
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