Post-Quantum Cryptography

Contact: Tim Fritzmann, Thomas Schamberger

In recent years, the market for the Internet of Things (IoT) has rapidly grown. Public-key cryptography builds the basis for a secure communication between different devices. However, the fast progress in the development of quantum computers is leading to an increasing concern about the security of current communication systems. Practical quantum computing algorithms will be able to break most of the public-key cryptosystems in use, including Rivest-Shamir-Adleman (RSA) and Eliptic Curve Cryptography (ECC). In contrast to traditional cryptography, Post-Quantum Cryptography relies on different mathematical hard problems which are believed to be secure against quantum attacks. Post-Quantum Cryptography can be divided into four different main classes: Hash-based Cryptography, Isogeny-based Cryptography, Code-based Cryptography, and Lattice-based Cryptography.

Among the different classes, Lattice-based Cryptography is due to its simplicity, performance and relatively small key sizes one of the most promising approaches. In our research, we focus on secure and efficient HW/SW implementations of Lattice-based Cryptography and analyze their vulnerability to side-channel attacks in order to provide efficient countermeasures.


Selected Publications

Fritzmann, Tim and Sepulveda, Johanna: Efficient and Flexible Low-Power NTT for Lattice-Based Cryptography. In 2019 IEEE International Symposium on Hardware-Oriented Security and Trust (HOST)

Schamberger, Thomas and Mischke, Oliver and Sepulveda, Johanna: Practical Evaluation of Masking for NTRUEncrypt on ARM Cortex-M4. Constructive Side-Channel Analysis and Secure Design, Springer International Publishing, 2019 Constructive Side-Channel Analysis and Secure Design 2019 (COSADE)

Fritzmann, Tim and Sharif, Uzair and Müller-Gritschneder, Daniel and Reinbrecht, Cezar and Schlichtmann, Ulf and Sepulveda, Johanna: Towards Reliable and Secure Post-Quantum Co-Processors based on RISC-V. Design, Automation & Test in Europe (DATE) 2019, 2019 Florence, Italy

Braun, Konstantin and Fritzmann, Tim and Maringer, Georg and Schamberger, Thomas and Sepulveda, Johanna: Secure and Compact Full NTRU Hardware Implementation. 26th IFIP/IEEE International Conference on Very Large Scale Integration (VLSI-SoC), 2018 Verona, Italy

Fritzmann, Tim and Pöppelmann, Thomas and Sepulveda, Johanna: Analysis of Error-Correcting Codes for Lattice-Based Key Exchange. Conference on Selected Areas in Cryptography (SAC), 2018 Calgary, Canada, 1-22