Cryptographic Message Syntax (CMS) Encrypted Key Package Content Type
RFC 6032
| Document | Type |
RFC - Proposed Standard
(December 2010; No errata)
Was draft-turner-encryptedkeypackagecontenttype (individual in sec area)
|
|
|---|---|---|---|
| Last updated | 2015-10-14 | ||
| Stream | IETF | ||
| Formats | plain text pdf html bibtex | ||
| Reviews | |||
| Stream | WG state | (None) | |
| Document shepherd | No shepherd assigned | ||
| IESG | IESG state | RFC 6032 (Proposed Standard) | |
| Consensus Boilerplate | Unknown | ||
| Telechat date | |||
| Responsible AD | Tim Polk | ||
| Send notices to | cwallace@cygnacom.com | ||
Internet Engineering Task Force (IETF) S. Turner
Request for Comments: 6032 IECA
Category: Standards Track R. Housley
ISSN: 2070-1721 Vigil Security
December 2010
Cryptographic Message Syntax (CMS)
Encrypted Key Package Content Type
Abstract
This document defines the Cryptographic Message Syntax (CMS)
encrypted key package content type, which can be used to encrypt a
content that includes a key package, such as a symmetric key package
or an asymmetric key package. It is transport independent. CMS can
be used to digitally sign, digest, authenticate, or further encrypt
this content type. It is designed to be used with the CMS Content
Constraints (CCC) extension, which does not constrain the
EncryptedData, EnvelopedData, and AuthEnvelopedData.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in Section 2 of RFC 5741.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc6032.
Turner & Housley Standards Track [Page 1]
RFC 6032 CMS Encrypted Key Package Content Type December 2010
Copyright Notice
Copyright (c) 2010 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
1. Introduction
The Cryptographic Message Syntax (CMS) specification [RFC5652]
defines mechanisms to digitally sign, digest, authenticate, or
encrypt arbitrary message content. Many specifications define
content types intended for use with CMS. [RFC6031] and [RFC5958]
define symmetric key package and asymmetric key package content types
that can be signed or encrypted using CMS. CMS allows the
composition of complex messages with an arbitrary number of layers.
CMS has been augmented by several specifications ([RFC3274],
[RFC4073], and [RFC5083]) that define additional mechanisms to enable
creation of messages of arbitrary depth and breadth using a variety
of authentication, encryption, and compression techniques.
The CMS Content Constraints (CCC) certificate extension [RFC6010]
defines an authorization mechanism that allows recipients to
determine whether the originator of an authenticated CMS content type
is authorized to produce messages of that type. CCC is used to
authorize CMS-protected content. CCC cannot be used to constrain the
following structures that are used to provide layers of protection:
SignedData, EnvelopedData, EncryptedData, DigestData, CompressedData,
AuthenticatedData, ContentCollection, ContentWithAttributes, or
AuthEnvelopedData.
Using the existing CMS mechanisms, producers of authenticated
plaintext key packages can be authorized by including a CCC extension
containing the appropriate content type in the producer's
certificate. However, these mechanisms cannot be used to authorize
the producers of encrypted key material. In some key management
systems, encrypted key packages are exchanged between entities that
cannot decrypt the key package. The encrypted key package itself may
Turner & Housley Standards Track [Page 2]
RFC 6032 CMS Encrypted Key Package Content Type December 2010
be authenticated and passed to another entity. In these cases,
checking the authorization of the producer of the encrypted key
package may be desired at the intermediate points.
This document defines the encrypted key package content type, which
can be used to encrypt a content that includes a key package, such as
a symmetric key package [RFC6031] or an asymmetric key package
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