End-to-End Object Encryption and Signatures for the Extensible Messaging and Presence Protocol (XMPP)
draft-miller-xmpp-e2e-06

XMPP                                                           M. Miller
Internet-Draft                                       Cisco Systems, Inc.
Intended status: Standards Track                           June 13, 2013
Expires: December 15, 2013

End-to-End Object Encryption and Signatures for the Extensible Messaging
                      and Presence Protocol (XMPP)
                        draft-miller-xmpp-e2e-06

Abstract

   This document defines two methods for securing objects (often
   referred to as stanzas) for the Extensible Messaging and Presence
   Protocol (XMPP), which allows for efficient asynchronous
   communication between two entities, each with might have multiple
   devices operating simultaneously.  One is a method to encrypt stanzas
   to provide confidentiality protection; another is a method to sign
   stanzas to provide authentication and integrity protection.  This
   document also defines a related protocol for entities to request the
   ephemeral session keys in use.

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Miller                 Expires December 15, 2013                [Page 1]
Internet-Draft                  XMPP E2E                       June 2013

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Encryption  . . . . . . . . . . . . . . . . . . . . . . . . .   3
     3.1.  Determining Support . . . . . . . . . . . . . . . . . . .   4
     3.2.  Encrypting XMPP Stanzas . . . . . . . . . . . . . . . . .   4
       3.2.1.  Prerequisites . . . . . . . . . . . . . . . . . . . .   4
       3.2.2.  Process . . . . . . . . . . . . . . . . . . . . . . .   5
     3.3.  Decrypting XMPP Stanzas . . . . . . . . . . . . . . . . .   7
       3.3.1.  Protocol Not Understood . . . . . . . . . . . . . . .   7
       3.3.2.  Process . . . . . . . . . . . . . . . . . . . . . . .   7
       3.3.3.  Insufficient Information  . . . . . . . . . . . . . .   8
       3.3.4.  Failed Decryption . . . . . . . . . . . . . . . . . .   9
       3.3.5.  Timestamp Not Acceptable  . . . . . . . . . . . . . .  10
       3.3.6.  Successful Decryption . . . . . . . . . . . . . . . .  11
     3.4.  Example - Securing a Message  . . . . . . . . . . . . . .  11
   4.  Signatures  . . . . . . . . . . . . . . . . . . . . . . . . .  14
     4.1.  Determining Support . . . . . . . . . . . . . . . . . . .  14
     4.2.  Signing XMPP Stanzas  . . . . . . . . . . . . . . . . . .  15
       4.2.1.  Process . . . . . . . . . . . . . . . . . . . . . . .  15
     4.3.  Verifying Signed XMPP Stanzas . . . . . . . . . . . . . .  17
       4.3.1.  Protocol Not Understood . . . . . . . . . . . . . . .  17
       4.3.2.  Process . . . . . . . . . . . . . . . . . . . . . . .  17
       4.3.3.  Insufficient Information  . . . . . . . . . . . . . .  18
       4.3.4.  Failed Verification . . . . . . . . . . . . . . . . .  18
       4.3.5.  Timestamp Not Acceptable  . . . . . . . . . . . . . .  19
       4.3.6.  Successful Verification . . . . . . . . . . . . . . .  20
     4.4.  Example - Signing a Message . . . . . . . . . . . . . . .  20
   5.  Requesting Session Keys . . . . . . . . . . . . . . . . . . .  23
     5.1.  Request Process . . . . . . . . . . . . . . . . . . . . .  23
     5.2.  Accept Process  . . . . . . . . . . . . . . . . . . . . .  24
     5.3.  Error Conditions  . . . . . . . . . . . . . . . . . . . .  25