Hypertext Transfer Protocol (HTTP) Digest Authentication
Using Authentication and Key Agreement (AKA)
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 (2002). All Rights Reserved.

Abstract

This memo specifies an Authentication and Key Agreement (AKA) based
one-time password generation mechanism for Hypertext Transfer
Protocol (HTTP) Digest access authentication. The HTTP
Authentication Framework includes two authentication schemes: Basic
and Digest. Both schemes employ a shared secret based mechanism for
access authentication. The AKA mechanism performs user
authentication and session key distribution in Universal Mobile
Telecommunications System (UMTS) networks. AKA is a challenge-
response based mechanism that uses symmetric cryptography.

Table of Contents

1. Introduction and Motivation . . . . . . . . . . . . . . . . . 2
1.1 Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Conventions . . . . . . . . . . . . . . . . . . . . . . . . . 4
2. AKA Mechanism Overview . . . . . . . . . . . . . . . . . . . . 4
3. Specification of Digest AKA . . . . . . . . . . . . . . . . . 5
3.1 Algorithm Directive . . . . . . . . . . . . . . . . . . . . . 5
3.2 Creating a Challenge . . . . . . . . . . . . . . . . . . . . . 6
3.3 Client Authentication . . . . . . . . . . . . . . . . . . . . 7
3.4 Synchronization Failure . . . . . . . . . . . . . . . . . . . 7
3.5 Server Authentication . . . . . . . . . . . . . . . . . . . . 8
4. Example Digest AKA Operation . . . . . . . . . . . . . . . . . 8
5. Security Considerations . . . . . . . . . . . . . . . . . . . 12
5.1 Authentication of Clients using Digest AKA . . . . . . . . . . 13
5.2 Limited Use of Nonce values . . . . . . . . . . . . . . . . . 13
5.3 Multiple Authentication Schemes and Algorithms . . . . . . . . 14
5.4 Online Dictionary Attacks . . . . . . . . . . . . . . . . . . 14
5.5 Session Protection . . . . . . . . . . . . . . . . . . . . . . 14
5.6 Replay Protection . . . . . . . . . . . . . . . . . . . . . . 15
5.7 Improvements to AKA Security . . . . . . . . . . . . . . . . . 15
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 15
6.1 Registration Template . . . . . . . . . . . . . . . . . . . . 16
Normative References . . . . . . . . . . . . . . . . . . . . . 16
Informative References . . . . . . . . . . . . . . . . . . . . 16
A. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 17
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . 17
Full Copyright Statement . . . . . . . . . . . . . . . . . . . 18
from http://www.faqs.org/rfcs/rfc3310.html

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