to the webpages of the "Codes and Cryptography" research group. In the research group, we develop and investigate cryptographic methods, especially for the protection of privacy. Our interests and works range from the complexity-theoretical and algorithmic foundations of cryptographic techniques to the design and proof of the security of cryptographic primitives and to the efficient implementation of these primitives. The focus is on lattice-based primitives and rationally secure primitives. Lattice-based methods use methods from the (algorithmic) geometry of numbers and are considered promising candidates for methods that resist attacks from quantum computers, i.e. are post-quantum secure. While cryptography usually considers malicious attackers, rationally secure cryptography studies methods that are secure against selfish attackers, where selfishness is defined in terms of game theory.