draft-ietf-openpgp-camellia-01.txt   draft-ietf-openpgp-camellia-02.txt 
Network Working Group D. Shaw Network Working Group D. Shaw
Updates: 4880 (if approved) Updates: 4880 (if approved)
Intended status: Standards Track Intended status: Standards Track
Expires: July 24, 2008 Expires: October 16, 2008
The Camellia Cipher in OpenPGP The Camellia Cipher in OpenPGP
draft-ietf-openpgp-camellia-01 draft-ietf-openpgp-camellia-02
Status of this Memo Status of this Memo
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Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
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This Internet-Draft will expire on July 24, 2008. This Internet-Draft will expire on October 16, 2008.
Copyright Notice Copyright Notice
Copyright (C) The IETF Trust (2008). Copyright (C) The IETF Trust (2008).
Abstract Abstract
This document presents the necessary information to use the Camellia This document presents the necessary information to use the Camellia
symmetric block cipher in the OpenPGP protocol. symmetric block cipher in the OpenPGP protocol.
Table of Contents Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Requirements notation . . . . . . . . . . . . . . . . . . . . . 3 2. Requirements notation . . . . . . . . . . . . . . . . . . . . . 3
3. Camellia . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3. Camellia . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
4. Security Considerations . . . . . . . . . . . . . . . . . . . . 3 4. Security Considerations . . . . . . . . . . . . . . . . . . . . 4
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 4 5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 4
6. Normative References . . . . . . . . . . . . . . . . . . . . . 4 6. Normative References . . . . . . . . . . . . . . . . . . . . . 4
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 4 Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 4
Intellectual Property and Copyright Statements . . . . . . . . . . 5 Intellectual Property and Copyright Statements . . . . . . . . . . 5
1. Introduction 1. Introduction
The OpenPGP protocol [RFC4880] can support many different symmetric The OpenPGP protocol [RFC4880] can support many different symmetric
ciphers. This document presents the necessary information to use the ciphers. This document presents the necessary information to use the
Camellia [RFC3713] cipher in the OpenPGP protocol. Camellia [RFC3713] cipher in the OpenPGP protocol.
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2. Requirements notation 2. Requirements notation
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [RFC2119]. document are to be interpreted as described in [RFC2119].
3. Camellia 3. Camellia
Camellia is specified in [RFC3713]. It is a 128-bit block cipher (as Camellia is specified in [RFC3713]. It is a 128-bit block cipher (as
is AES and Twofish in OpenPGP), that supports 128-bit, 192-bit, and is AES and Twofish in OpenPGP), that supports 128-bit, 192-bit, and
256-bit keys. This document defines the use of the 128-bit and 256- 256-bit keys. This document defines the use of Camellia in OpenPGP.
bit Camellia key lengths in OpenPGP.
+---------------------+----------------------------------------+
| Camellia Key Length | OpenPGP Symmetric-Key Algorithm Number |
+---------------------+----------------------------------------+
| 128 | XXXX |
| 192 | YYYY |
| 256 | ZZZZ |
+---------------------+----------------------------------------+
The OpenPGP symmetric key algorithm number for Camellia with a 128-
bit key is XXXX and the algorithm number for a 256-bit key is YYYY.
[[To be allocated by IANA. Please fill this in: presumably XXXX == [[To be allocated by IANA. Please fill this in: presumably XXXX ==
11 and YYYY == 12]] 11, YYYY == 12, and ZZZZ == 13]]
OpenPGP applications MAY implement Camellia. If implemented, OpenPGP applications MAY implement Camellia. If implemented,
Camellia may be used in any place in OpenPGP where a symmetric cipher Camellia may be used in any place in OpenPGP where a symmetric cipher
is usable, and is subject to the same usage requirements (such as its is usable, and is subject to the same usage requirements (such as its
presence in the Preferred Symmetric Algorithms signature subpacket) presence in the Preferred Symmetric Algorithms signature subpacket)
as the other symmetric ciphers in OpenPGP. as the other symmetric ciphers in OpenPGP.
While the OpenPGP algorithm preferences system prevents While the OpenPGP algorithm preferences system prevents
interoperability problems with public key encrypted messages, if interoperability problems with public key encrypted messages, if
Camellia (or any other optional cipher) is used for encrypting Camellia (or any other optional cipher) is used for encrypting
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