Use of Timed Efficient Stream Loss-Tolerant Authentication (TESLA) in the Asynchronous Layered Coding (ALC) and NACK-Oriented Reliable Multicast (NORM) Protocols
RFC 5776

Internet Engineering Task Force (IETF)                           V. Roca
Request for Comments: 5776                                 A. Francillon
Category: Experimental                                        S. Faurite
ISSN: 2070-1721                                                    INRIA
                                                              April 2010

 Use of Timed Efficient Stream Loss-Tolerant Authentication (TESLA) in
               the Asynchronous Layered Coding (ALC) and
           NACK-Oriented Reliable Multicast (NORM) Protocols

Abstract

   This document details the Timed Efficient Stream Loss-Tolerant
   Authentication (TESLA) packet source authentication and packet
   integrity verification protocol and its integration within the
   Asynchronous Layered Coding (ALC) and NACK-Oriented Reliable
   Multicast (NORM) content delivery protocols.  This document only
   considers the authentication/integrity verification of the packets
   generated by the session's sender.  The authentication and integrity
   verification of the packets sent by receivers, if any, is out of the
   scope of this document.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for examination, experimental implementation, and
   evaluation.

   This document defines an Experimental Protocol for the Internet
   community.  This document is a product of the Internet Engineering
   Task Force (IETF).  It represents the consensus of the IETF
   community.  It has received public review and has been approved for
   publication by the Internet Engineering Steering Group (IESG).  Not
   all documents approved by the IESG are a candidate for any level of
   Internet Standard; see Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc5776.

Roca, et al.                  Experimental                      [Page 1]
RFC 5776                  TESLA in ALC and NORM               April 2010

Copyright Notice

   Copyright (c) 2010 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
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   Without obtaining an adequate license from the person(s) controlling
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   it for publication as an RFC or to translate it into languages other
   than English.

Roca, et al.                  Experimental                      [Page 2]
RFC 5776                  TESLA in ALC and NORM               April 2010

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  5
     1.1.  Scope of This Document . . . . . . . . . . . . . . . . . .  6
     1.2.  Conventions Used in This Document  . . . . . . . . . . . .  7
     1.3.  Terminology and Notations  . . . . . . . . . . . . . . . .  7
       1.3.1.  Notations and Definitions Related to Cryptographic
               Functions  . . . . . . . . . . . . . . . . . . . . . .  7
       1.3.2.  Notations and Definitions Related to Time  . . . . . .  8
   2.  Using TESLA with ALC and NORM: General Operations  . . . . . .  9
     2.1.  ALC and NORM Specificities That Impact TESLA . . . . . . .  9
     2.2.  Bootstrapping TESLA  . . . . . . . . . . . . . . . . . . . 10
       2.2.1.  Bootstrapping TESLA with an Out-Of-Band Mechanism  . . 10
       2.2.2.  Bootstrapping TESLA with an In-Band Mechanism  . . . . 11
     2.3.  Setting Up a Secure Time Synchronization . . . . . . . . . 11
       2.3.1.  Direct Time Synchronization  . . . . . . . . . . . . . 12
       2.3.2.  Indirect Time Synchronization  . . . . . . . . . . . . 12
     2.4.  Determining the Delay Bounds . . . . . . . . . . . . . . . 13