INDES Seminar 2021


Prof. Dr. Thorsten Strufe

Karlsruhe Institute of Technology (KIT/KASTEL)
TU Dresden (CeTI)

When: Tu, 28.09.2021, at 10:30

Where: Euler Violet


ProMACs: Leveraging the Streaming Paradigm to Improve Integrity without Transmission Cost

Language: english


Efficiently integrity verification of received data requires Message Authentication Code (MAC) tags. However, while security calls for rather long tags, in many scenarios this contradicts other requirements.
Examples are strict delay requirements (e.g., robot or drone control) or resource-scarce settings.
Prior techniques suggested truncation of MAC tags, thus trading off linear performance gain for exponential security loss. To achieve security of full-length MACs with short(er) tags, we introduce Progressive MACs (ProMACs) -- a scheme that uses internal state to gradually increase security upon reception of subsequent messages. We provide a formal framework and propose a provably secure, generic construction called Whips. We evaluate applicability of ProMACs in several realistic scenarios and demonstrate example settings where ProMACs can be used as a drop-in replacement for traditional MACs.


Thorsten Strufe is professor for IT Security at Karlsruhe Institute of Technology (KIT/KASTEL), and adjunct professor for Privacy and Network Security at TU Dresden, as deputy speaker of the Excellence Centre for Tactile Internet with Human-in-the-Loop (CeTI). His research interests lie in the areas of privacy and resilience, especially in the context of social networking services and large scale distributed systems.
Recently, he has focused on studying privacy implications of user behavior and possibilities to provide privacy-preserving and secure networked services. Previous posts include faculty positions at TU Dresden, TU Darmstadt, and Uni Mannheim, as well as postdoc/researcher positions at EURECOM and TU Ilmenau.