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)
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Authors | Russ Housley , Sean Turner | ||
Last updated | 2015-10-14 | ||
Stream | IETF | ||
Formats | plain text html pdf htmlized 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 [RFC5958]. It is transport independent. The Cryptographic Message Syntax (CMS) [RFC5652] can be used to digitally sign, digest, authenticate, or further encrypt this content type.Show full document text