Online GAPS continues the GAPS 2025 workshop, as a regular online seminar. It provides a platform for researchers interested in provable security for symmetric-key cryptography. Topics include proof techniques, security notions, and generic attacks; related topics such as cryptanalysis and mathematical foundations are also welcome.
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.
Please note that all times are given in UTC. You may consider adding the calendar (or a specific event) to your Google account; in that case, the times in your calendar will be adjusted to your time zone setting.
The seminars take place on Zoom, and recordings of the presentations may be uploaded to YouTube.
You may contact them at onlinegaps@gmail.com to suggest talks, or to join the google group. Please note that talk slots are limited, so we may not be able to accommodate every suggestion.