Message Encryption for Web Push
draft-ietf-webpush-encryption-03

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Document Type Active Internet-Draft (webpush WG)
Last updated 2016-06-29
Replaces draft-thomson-webpush-encryption
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Network Working Group                                         M. Thomson
Internet-Draft                                                   Mozilla
Intended status: Standards Track                           June 29, 2016
Expires: December 31, 2016

                    Message Encryption for Web Push
                    draft-ietf-webpush-encryption-03

Abstract

   A message encryption scheme is described for the Web Push protocol.
   This scheme provides confidentiality and integrity for messages sent
   from an Application Server to a User Agent.

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
   Task Force (IETF).  Note that other groups may also distribute
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   This Internet-Draft will expire on December 31, 2016.

Copyright Notice

   Copyright (c) 2016 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
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   described in the Simplified BSD License.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Notational Conventions  . . . . . . . . . . . . . . . . .   3
   2.  Key Generation and Agreement  . . . . . . . . . . . . . . . .   3
     2.1.  Diffie-Hellman Group Information  . . . . . . . . . . . .   3
     2.2.  Key Distribution  . . . . . . . . . . . . . . . . . . . .   4
     2.3.  Push Message Authentication . . . . . . . . . . . . . . .   4
   3.  Message Encryption  . . . . . . . . . . . . . . . . . . . . .   4
     3.1.  Key Derivation  . . . . . . . . . . . . . . . . . . . . .   4
     3.2.  Push Message Content Encryption . . . . . . . . . . . . .   5
   4.  Message Decryption  . . . . . . . . . . . . . . . . . . . . .   6
   5.  Mandatory Group and Public Key Format . . . . . . . . . . . .   6
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   7
     8.2.  Informative References  . . . . . . . . . . . . . . . . .   7
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   8

1.  Introduction

   The Web Push protocol [I-D.ietf-webpush-protocol] is an intermediated
   protocol by necessity.  Messages from an Application Server are
   delivered to a User Agent via a Push Service.

    +-------+           +--------------+       +-------------+
    |  UA   |           | Push Service |       | Application |
    +-------+           +--------------+       +-------------+
        |                      |                      |
        |        Setup         |                      |
        |<====================>|                      |
        |           Provide Subscription              |
        |-------------------------------------------->|
        |                      |                      |
        :                      :                      :
        |                      |     Push Message     |
        |    Push Message      |<---------------------|
        |<---------------------|                      |
        |                      |                      |

   This document describes how messages sent using this protocol can be
   secured against inspection, modification and falsification by a Push
   Service.

   Web Push messages are the payload of an HTTP message [RFC7230].
   These messages are encrypted using an encrypted content encoding
   [I-D.ietf-httpbis-encryption-encoding].  This document describes how

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   this content encoding is applied and describes a recommended key
   management scheme.
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