ECDHE_PSK Cipher Suites for Transport Layer Security (TLS)
RFC 5489
Network Working Group M. Badra
Request for Comments: 5489 CNRS/LIMOS Laboratory
Category: Informational I. Hajjeh
INEOVATION
March 2009
ECDHE_PSK Cipher Suites for Transport Layer Security (TLS)
Status of This Memo
This memo provides information for the Internet community. It does
not specify an Internet standard of any kind. Distribution of this
memo is unlimited.
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Abstract
This document extends RFC 4279, RFC 4492, and RFC 4785 and specifies
a set of cipher suites that use a pre-shared key (PSK) to
authenticate an Elliptic Curve Diffie-Hellman exchange with Ephemeral
keys (ECDHE). These cipher suites provide Perfect Forward Secrecy
(PFS).
Badra & Hajjeh Informational [Page 1]
RFC 5489 ECDHE_PSK Cipher Suites for TLS March 2009
Table of Contents
1. Introduction ....................................................2
1.1. Applicability Statement ....................................3
1.2. Conventions Used in This Document ..........................3
2. ECDHE_PSK Key Exchange Algorithm ................................3
3. ECDHE_PSK-Based Cipher Suites ...................................4
3.1. ECDHE_PSK Cipher Suites Using the SHA-1 Hash ...............4
3.2. ECDHE_PSK Cipher Suites Using SHA-2 Hashes .................4
4. ECDHE_PSK-Based Cipher Suites with NULL Encryption ..............5
4.1. ECDHE_PSK Cipher Suite Using the SHA-1 Hash with
NULL Encryption ............................................5
4.2. ECDHE_PSK Cipher Suites Using SHA-2 Hashes with
NULL Encryption ............................................5
5. Security Considerations .........................................5
6. IANA Considerations .............................................6
7. Acknowledgments .................................................6
8. Normative References ............................................6
1. Introduction
RFC 4279 specifies cipher suites for supporting TLS using pre-shared
symmetric keys that (a) use only symmetric key operations for
authentication, (b) use a Diffie-Hellman exchange authenticated with
a pre-shared key (PSK), or (c) combine public key authentication of
the server with pre-shared key authentication of the client.
RFC 4785 specifies authentication-only cipher suites (with no
encryption). These cipher suites are useful when authentication and
integrity protection is desired, but confidentiality is not needed or
not permitted.
RFC 4492 defines a set of Elliptic Curve Cryptography (ECC)-based
cipher suites for TLS and describes the use of ECC certificates for
client authentication. In particular, it specifies the use of
Elliptic Curve Diffie-Hellman (ECDH) key agreement in a TLS handshake
and the use of the Elliptic Curve Digital Signature Algorithm (ECDSA)
as a new authentication mechanism.
This document specifies a set of cipher suites that use a PSK to
authenticate an ECDH exchange. These cipher suites provide Perfect
Forward Secrecy. Some of these cipher suites provide authentication
only.
The reader is expected to become familiar with RFC 4279, RFC 4492,
and RFC 4785 prior to studying this document.
Badra & Hajjeh Informational [Page 2]
RFC 5489 ECDHE_PSK Cipher Suites for TLS March 2009
1.1. Applicability Statement
The cipher suites defined in this document can be negotiated,
whatever the negotiated TLS version is.
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