Elliptic Curve Cryptography (ECC) Cipher Suites for Transport Layer Security (TLS)
RFC 4492
| Document | Type |
RFC - Informational
(May 2006; Errata)
Obsoleted by RFC 8422
Was draft-ietf-tls-ecc (tls WG)
|
|
|---|---|---|---|
| Authors | Bodo Moeller , Nelson Bolyard , Vipul Gupta , Simon Blake-Wilson , Chris Hawk | ||
| Last updated | 2020-01-21 | ||
| Stream | IETF | ||
| Formats | plain text html pdf htmlized with errata bibtex | ||
| Stream | WG state | (None) | |
| Document shepherd | No shepherd assigned | ||
| IESG | IESG state | RFC 4492 (Informational) | |
| Action Holders |
(None)
|
||
| Consensus Boilerplate | Unknown | ||
| Telechat date | |||
| Responsible AD | Russ Housley | ||
| Send notices to | ekr@networkresonance.com | ||
Network Working Group S. Blake-Wilson
Request for Comments: 4492 SafeNet
Category: Informational N. Bolyard
Sun Microsystems
V. Gupta
Sun Labs
C. Hawk
Corriente
B. Moeller
Ruhr-Uni Bochum
May 2006
Elliptic Curve Cryptography (ECC) 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.
Copyright Notice
Copyright (C) The Internet Society (2006).
Abstract
This document describes new key exchange algorithms based on Elliptic
Curve Cryptography (ECC) for the Transport Layer Security (TLS)
protocol. In particular, it specifies the use of Elliptic Curve
Diffie-Hellman (ECDH) key agreement in a TLS handshake and the use of
Elliptic Curve Digital Signature Algorithm (ECDSA) as a new
authentication mechanism.
Blake-Wilson, et al. Informational [Page 1]
RFC 4492 ECC Cipher Suites for TLS May 2006
Table of Contents
1. Introduction ....................................................3
2. Key Exchange Algorithms .........................................4
2.1. ECDH_ECDSA .................................................6
2.2. ECDHE_ECDSA ................................................6
2.3. ECDH_RSA ...................................................7
2.4. ECDHE_RSA ..................................................7
2.5. ECDH_anon ..................................................7
3. Client Authentication ...........................................8
3.1. ECDSA_sign .................................................8
3.2. ECDSA_fixed_ECDH ...........................................9
3.3. RSA_fixed_ECDH .............................................9
4. TLS Extensions for ECC ..........................................9
5. Data Structures and Computations ...............................10
5.1. Client Hello Extensions ...................................10
5.1.1. Supported Elliptic Curves Extension ................12
5.1.2. Supported Point Formats Extension ..................13
5.2. Server Hello Extension ....................................14
5.3. Server Certificate ........................................15
5.4. Server Key Exchange .......................................17
5.5. Certificate Request .......................................21
5.6. Client Certificate ........................................22
5.7. Client Key Exchange .......................................23
5.8. Certificate Verify ........................................25
5.9. Elliptic Curve Certificates ...............................26
5.10. ECDH, ECDSA, and RSA Computations ........................26
6. Cipher Suites ..................................................27
7. Security Considerations ........................................28
8. IANA Considerations ............................................29
9. Acknowledgements ...............................................29
10. References ....................................................30
10.1. Normative References .....................................30
10.2. Informative References ...................................31
Appendix A. Equivalent Curves (Informative) ......................32
Blake-Wilson, et al. Informational [Page 2]
RFC 4492 ECC Cipher Suites for TLS May 2006
1. Introduction
Elliptic Curve Cryptography (ECC) is emerging as an attractive
public-key cryptosystem, in particular for mobile (i.e., wireless)
environments. Compared to currently prevalent cryptosystems such as
RSA, ECC offers equivalent security with smaller key sizes. This is
illustrated in the following table, based on [18], which gives
approximate comparable key sizes for symmetric- and asymmetric-key
cryptosystems based on the best-known algorithms for attacking them.
Symmetric | ECC | DH/DSA/RSA
------------+---------+-------------
80 | 163 | 1024
112 | 233 | 2048
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