Recommendations for Secure Use of TLS and DTLS
draft-ietf-uta-tls-bcp-00

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Last updated 2014-03-27
Replaces draft-sheffer-tls-bcp
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UTA                                                           Y. Sheffer
Internet-Draft                                                  Porticor
Intended status: Best Current Practice                           R. Holz
Expires: September 28, 2014                                          TUM
                                                          P. Saint-Andre
                                                                    &yet
                                                          March 27, 2014

             Recommendations for Secure Use of TLS and DTLS
                       draft-ietf-uta-tls-bcp-00

Abstract

   Transport Layer Security (TLS) and Datagram Transport Security Layer
   (DTLS) are widely used to protect data exchanged over application
   protocols such as HTTP, SMTP, IMAP, POP, SIP, and XMPP.  Over the
   last few years, several serious attacks on TLS have emerged,
   including attacks on its most commonly used cipher suites and modes
   of operation.  This document provides recommendations for improving
   the security of both software implementations and deployed services
   that use TLS and DTLS.

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 September 28, 2014.

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

Sheffer, et al.        Expires September 28, 2014               [Page 1]
Internet-Draft             TLS Recommendations                March 2014

   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions used in this document . . . . . . . . . . . . . .   3
   3.  Recommendations . . . . . . . . . . . . . . . . . . . . . . .   3
     3.1.  Protocol Versions . . . . . . . . . . . . . . . . . . . .   3
     3.2.  Fallback to SSL . . . . . . . . . . . . . . . . . . . . .   4
     3.3.  Cipher Suites . . . . . . . . . . . . . . . . . . . . . .   4
     3.4.  Public Key Length . . . . . . . . . . . . . . . . . . . .   6
     3.5.  Compression . . . . . . . . . . . . . . . . . . . . . . .   6
     3.6.  Session Resumption  . . . . . . . . . . . . . . . . . . .   6
   4.  Detailed Guidelines . . . . . . . . . . . . . . . . . . . . .   6
     4.1.  Cipher Suite Negotiation Details  . . . . . . . . . . . .   7
     4.2.  Alternative Cipher Suites . . . . . . . . . . . . . . . .   7
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
     6.1.  AES-GCM . . . . . . . . . . . . . . . . . . . . . . . . .   8
     6.2.  Forward Secrecy . . . . . . . . . . . . . . . . . . . . .   8
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   9
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   9
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  10
   Appendix A.  Appendix: Change Log . . . . . . . . . . . . . . . .  11
     A.1.  draft-ietf-tls-bcp-00 . . . . . . . . . . . . . . . . . .  11
     A.2.  draft-sheffer-tls-bcp-02  . . . . . . . . . . . . . . . .  11
     A.3.  draft-sheffer-tls-bcp-01  . . . . . . . . . . . . . . . .  11
     A.4.  draft-sheffer-tls-bcp-00  . . . . . . . . . . . . . . . .  12
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  12

1.  Introduction

   Transport Layer Security (TLS) and Datagram Transport Security Layer
   (DTLS) are widely used to protect data exchanged over application
   protocols such as HTTP, SMTP, IMAP, POP, SIP, and XMPP.  Over the
   last few years, several serious attacks on TLS have emerged,
   including attacks on its most commonly used cipher suites and modes
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