[TLS] New draft: draft-ietf-tls-tls13-14.txt

[Eric Rescorla <[e-mail]>]

Folks,

I've just submitted draft-ietf-tls-tls13-14.txt and it should
show up on the draft repository shortly. In the meantime you
can find the editor's copy in the usual location at:

  http://tlswg.github.io/tls13-spec/

The major changes in this document are:

* A big restructure to make it read better. I moved the Overview
  to the beginning and then put the document in a more logical
  order starting with the handshake and then the record and
  alerts.

* Totally rewrote the section which used to be called "Security
  Analysis" and is now called "Overview of Security Properties".
  This section is still kind of a hard hat area, so PRs welcome.
  In particular, I know I need to beef up the citations for the
  record layer section.

* Removed the 0-RTT EncryptedExtensions and moved ticket_age
  into the ClientHello. This quasi-reverts a change in -13 that
  made implementation of 0-RTT kind of a pain.

As usual, comments welcome.
-Ekr



* Allow cookies to be longer (*)

* Remove the "context" from EarlyDataIndication as it was undefined
  and nobody used it (*)

* Remove 0-RTT EncryptedExtensions and replace the ticket_age extension
  with an obfuscated version. Also necessitates a change to
  NewSessionTicket (*).

* Move the downgrade sentinel to the end of ServerHello.Random
  to accomodate tlsdate (*).

* Define ecdsa_sha1 (*).

* Allow resumption even after fatal alerts. This matches current
  practice.

* Remove non-closure warning alerts. Require treating unknown alerts as
  fatal.

* Make the rules for accepting 0-RTT less restrictive.

* Clarify 0-RTT backward-compatibility rules.

* Clarify how 0-RTT and PSK identities interact.

* Add a section describing the data limits for each cipher.

* Major editorial restructuring.

* Replace the Security Analysis section with a WIP draft.

(*) indicates changes to the wire protocol which may require implementations
    to update.