Cryptology ePrint Archive: Report 2015/394

Augmented Secure Channels and the Goal of the TLS 1.3 Record Layer

Christian Badertscher and Christian Matt and Ueli Maurer and Phillip Rogaway and Björn Tackmann

Abstract: Motivated by the wide adoption of authenticated encryption and TLS, we suggest a basic channel abstraction, an augmented secure channel (ASC), that allows a sender to send a receiver messages consisting of two parts, where one is privacy-protected and both are authenticity-protected. Working in the tradition of constructive cryptography, we formalize this idea and provide a construction of this kind of channel using the lower-level tool authenticated-encryption.

We look at recent proposals on TLS 1.3 and suggest that the criterion by which their security can be judged is quite simple: do they construct an ASC? Due to this precisely defined goal, we are able to give a natural construction that comes with a rigorous security proof and directly leads to a proposal on TLS 1.3 that is provably secure.

Category / Keywords: secret-key cryptography / Authenticated Encryption, TLS 1.3 Record Layer, Composable Security

Original Publication (in the same form): ProvSec 2015

Date: received 27 Apr 2015, last revised 10 Sep 2015

Contact author: christian badertscher at inf ethz ch

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Version: 20150910:152457 (All versions of this report)

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