A TCP Authentication Option Extension for Payload Encryption
draft-touch-tcp-ao-encrypt-06

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TCPM WG                                                        J. Touch
Internet Draft                                                  USC/ISI
Intended status: Standards Track                       October 21, 2016
Expires: April 2017

       A TCP Authentication Option Extension for Payload Encryption
                     draft-touch-tcp-ao-encrypt-06.txt

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   Copyright (c) 2016 IETF Trust and the persons identified as the
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   Section 4.e of the Trust Legal Provisions and are provided without
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Abstract

   This document describes an extension to the TCP Authentication
   Option (TCP-AO) to encrypt the TCP segment payload in addition to
   providing TCP-AO's authentication of the payload, TCP header, and IP
   pseudoheader. This extension augments how the packet contents and
   headers are processed and which keys are derived, and adds a
   capability for in-band coordination of unauthenticated Diffie-
   Hellman key exchange at connection establishment. The extension
   preserves key rollover coordination and protection of long-lived
   connections.

Table of Contents

   1. Introduction...................................................2
   2. Conventions used in this document..............................3
   3. Background.....................................................3
   4. Authenticated and Unauthenticated Modes........................4
   5. Extension for Payload Encryption...............................4
      5.1. Additional Master Key Tuple components....................4
      5.2. Additional traffic keys...................................5
      5.3. Per-Connection TCP-AO Parameters..........................5
      5.4. Traffic Encryption Key Derivation Functions...............6
   6. TCP-AO-ENC Interaction with TCP................................6
      6.1. Sending TCP Segments......................................6
      6.2. Receiving TCP Segments....................................7
      6.3. Other TCP Impact..........................................7
   7. Security Considerations........................................7
   8. Keying Algorithms..............................................8
   9. IANA Considerations............................................8
   10. References....................................................8
      10.1. Normative References.....................................8
      10.2. Informative References...................................8
   11. Acknowledgments...............................................9

1. Introduction

   This document describes an extension to the TCP Authentication
   Option (TCP-AO) [RFC5925] called TCP-AO-ENC to support its use to
   encrypt TCP segment payload contents in addition to authenticating
   the segment. TCP-AO-ENC is intended for use where TCP user data
   privacy is required and where TCP control protocol protection is
   also needed.

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