International Association for Cryptologic Research

International Association
for Cryptologic Research

IACR News item: 01 May 2015

Christian Badertscher, Christian Matt, Ueli Maurer, Phillip Rogaway, Björn Tackmann
ePrint Report ePrint Report
Motivated by the wide adoption of authenticated encryption and TLS, we suggest a basic channel abstraction, an \\emph{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, in addition to being provably secure, is more efficient than existing ones.

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