Identity-Based Encryption Architecture and Supporting Data Structures
RFC 5408
Network Working Group G. Appenzeller
Request for Comments: 5408 Stanford University
Category: Informational L. Martin
Voltage Security
M. Schertler
Axway
January 2009
Identity-Based Encryption Architecture and Supporting Data Structures
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 describes the security architecture required to
implement identity-based encryption, a public-key encryption
technology that uses a user's identity as a public key. It also
defines data structures that can be used to implement the technology.
Appenzeller, et al. Informational [Page 1]
RFC 5408 IBE Architecture January 2009
Table of Contents
1. Introduction ....................................................3
1.1. Terminology ................................................3
2. Identity-Based Encryption .......................................3
2.1. Overview ...................................................3
2.2. Sending a Message That Is IBE-Encrypted ....................5
2.2.1. Sender Obtains Public Parameters ....................5
2.2.2. Construct and Send an IBE-Encrypted Message .........6
2.3. Receiving and Viewing an IBE-Encrypted Message .............6
2.3.1. Recipient Obtains Public Parameters .................7
2.3.2. Recipient Obtains IBE Private Key ...................8
2.3.3. Recipient Decrypts IBE-Encrypted Message ............8
3. Identity Format .................................................9
4. Public Parameter Lookup .........................................9
4.1. Request Method ............................................10
4.2. Parameter and Policy Format ...............................11
4.3. The application/ibe-pp-data MIME Type .....................14
5. Private Key Request Protocol ...................................15
5.1. Overview ..................................................15
5.2. Private Key Request .......................................15
5.3. Request Structure .........................................16
5.4. The application/ibe-key-request+xml MIME type .............17
5.5. Authentication ............................................18
5.6. Server Response Format ....................................18
5.6.1. The IBE100 responseCode ............................19
5.6.2. The IBE101 responseCode ............................20
5.6.3. The IBE201 responseCode ............................20
5.6.4. The IBE300 responseCode ............................21
5.6.5. The IBE301 responseCode ............................21
5.6.6. The IBE303 responseCode ............................21
5.6.7. The IBE304 responseCode ............................22
5.7. The application/ibe-pkg-reply+xml MIME type ...............22
6. ASN.1 Module ...................................................23
7. Security Considerations ........................................25
7.1. Attacks outside the Scope of This Document ................25
7.2. Attacks within the Scope of This Document .................26
7.2.1. Attacks on the Protocols Defined in This Document ..26
8. IANA Considerations ............................................27
8.1. Media Types ...............................................27
8.2. XML Namespace .............................................27
9. References .....................................................28
9.1. Normative References ......................................28
9.2. Informative References ....................................29
Appenzeller, et al. Informational [Page 2]
RFC 5408 IBE Architecture January 2009
1. Introduction
This document describes the security architecture required to
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