Guest talk by Sebastian Schlor

Sebastian Schlor is currently a research assistant and Ph.D. student at the University of Stuttgart with the Institute for Systems Theory and Automatic Control under the supervision of Prof. Frank Allgöwer. He received his B.Sc. and M.Sc. degree in Engineering Cybernetics from the University of Stuttgart in 2017 and 2020, respectively. His research interests include the area of privacy and security of dynamical systems and encrypted control.

In his talk, he will present a new perspective on cryptosystems from a systems theoretic point of view. He will show how the Diffie-Hellman key exchange cryptosystem can be reformulated as a nonlinear dynamical system. To analyze the cryptosystem, he will introduce an equivalent linear system, using ideas from Koopman theory. In principle, analytical tools for linear systems can then be used to reconstruct the secrets of the key exchange. He will relate the obtained state dimension as a notion of complexity to the classical concept of linear complexity. Finally, he will transfer this approach to a data-driven setting where the Koopman representation is learned from data samples of the cryptosystem.

Please contact our secretary in case you want to join the hybrid presentation via Zoom.