Security Labels in Internet Email
draft-zeilenga-email-seclabel-08

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Last updated 2014-09-02 (latest revision 2014-07-04)
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Network Working Group                                        K. Zeilenga
Internet-Draft                                               A. Melnikov
Intended status: Informational                             Isode Limited
Expires: January 5, 2015                                    July 4, 2014

                   Security Labels in Internet Email
                    draft-zeilenga-email-seclabel-08

Abstract

   This document describes a header field, SIO-Label, for use in
   Internet Mail to convey the sensitivity of the message.  This header
   field which may carry a textual representation (a display marking)
   and/or a structural representation (a security label) of the
   sensitivity of the message.  This document also describes a header
   field, SIO-Label-History, for recording changes in the message's
   label.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on January 5, 2015.

Copyright Notice

   Copyright (c) 2014 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

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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Relationship to Inline Sensitivity Markings . . . . . . .   3
     1.2.  Relationship to preexisting Security Label Header Fields    4
     1.3.  Relationship to Enhanced Security Services for S/MIME . .   4
   2.  Conventions Used in This Document . . . . . . . . . . . . . .   5
   3.  Overview  . . . . . . . . . . . . . . . . . . . . . . . . . .   5
   4.  The SIO-Label header field  . . . . . . . . . . . . . . . . .   6
   5.  The SIO-Label-History header field  . . . . . . . . . . . . .   9
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  10
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  11
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  12
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  12
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  13
   Appendix A.  Acknowledgements . . . . . . . . . . . . . . . . . .  14

1.  Introduction

   A security label, sometimes referred to as a confidentiality label,
   is a structured representation of the sensitivity of a piece of
   information.  A security label can be used in conjunction with a
   clearance, a structured representation of what information
   sensitivities a person (or other entity) is authorized to access, and
   a security policy to control access to each piece of information.
   For instance, an email message could have a EXAMPLE CONFIDENTIAL
   label, and hence requiring the sender and the receiver to have a
   clearance granting access to EXAMPLE CONFIDENTIAL labeled
   information.  X.841 [X.841] provides a discussion of security labels,
   clearances, and security policy.

   A display marking is a textual representation of the sensitivity of a
   piece of information.  For instance, "EXAMPLE CONFIDENTIAL" is a
   textual representation of the sensitivity.  A security policy can be
   used to generate display markings from security labels.  Display
   markings are generally expected to be prominently displayed whenever
   the content is displayed.

   Sensitivity-based authorization is used in networks which operate
   under a set of information classification rules, such as in
   government military agency networks.  The standardized formats for
   security labels, clearances, and security policy and associated
   authorization models are generalized and can be used in non-
   government deployments where appropriate.

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