The cooperation project with CISPA “Encrypted Computing Compass” provided an overview of the state-of-the art on secure computations with a particular focus on fully-homomorphic encryption. This project was the very first project funded by the Cyberagentur, whose goal is to commission research projects focused on key technologies and innovations in the field of cybersecurity. In the research project “Everlasting Security for Quantum Cryptographic Protocols for Encrypted Computing”, researchers from both centers proposed a new security model for quantum multi-party computations that exploits the fact that quantum states can only be kept for a limited time. In this model, a number of core building blocks can be realized with strong security guarantees even against quantum adversaries.

• N. Döttling, A. Koch, S. Maier, J. Mechler, A. Müller, J. Müller-Quade & K.M. Tiepelt (2026): The Quantum Decoherence Model: Everlasting Composable Secure Computation and More. – 15th International Conference on Security and Cryptography for Networks (SCN 2026): accepted.