Understanding the Duplex and Its Security - Bart Mennink

[Charlotte Lefevre]

Dear GAPS community, 

The next talk in the online GAPS seminar series has been announced: 

Understanding the Duplex and Its Security

Bart Mennink (Maastricht University) 

Wednesday, July 15, 2026 at 8:00am UTC (10:00am CEST) 

At SAC 2011, Bertoni et al. introduced the keyed duplex construction as a tool to build permutation based authenticated encryption schemes. The construction was generalized to full-state absorption by Mennink et al. (ASIACRYPT 2015). Daemen et al. (ASIACRYPT 2017) generalized it further to cover much more use cases, and proved security of this general construction, and Dobraunig and Mennink (ASIACRYPT 2019) derived a leakage resilience security bound for this construction. Due to its generality, the full-state keyed duplex construction that we know today has plethora applications, but the flip side of the coin is that the general construction is hard to grasp and the corresponding security bounds are very complex. Consequently, the state-of-the-art results on the full-state keyed duplex construction are not used to the fullest. In this work, we revisit the history of the duplex construction, give a comprehensive discussion of its possibilities and limitations, and demonstrate how the two security bounds (of Daemen et al. and Dobraunig and Mennink) can be interpreted in particular applications of the duplex.

The link will be sent before the talk as usual. 

Charlotte  

On behalf of the GAPS organizing committee