The Cybersecurity and Applied Cryptography group is a research group at the School of Computer Science at the University of St. Gallen led by Prof. Katerina Mitrokotsa, while a branch is located at Chalmers University of Technology.

Our research interests are centered around information security and applied cryptography, with the larger goal of safeguarding communications and providing strong privacy guarantees. We are active in several areas, a subset of which include:
  • Functional encryption
  • Verifiable computation
  • Secure, private and distributed aggregation
  • Secure multi-party computation
  • Privacy-preserving biometric authentication
  • Proximity-based authentication
Take a look at our research and publications pages for a full list.

Our flagship course Cybersecurity is offered in the Fall semester. We also offer a research seminar in the Spring and Fall semester, and a course on Cryptograhy in the Spring semester. Check our courses page for more information.

News

2025

  • February

    • New paper!

      Subhranil and Jenit's paper Multi-Client Attribute-Based Unbounded Inner Product Functional Encryption, and More has been accepted at PKC 2025.

    • New paper!

      Jenit's paper BUFFing Threshold Signature Schemes has been accepted at PKC 2025.

2024

2023

Recent Publications

Threshold Structure Preserving Signatures: Strong and Adaptive Security under Standard Assumptions
A. Mitrokotsa, S. Mukherjee, M. Sedaghat, D. Slamanig and J. Tomy
 Publication
Decentralized Private Steam Aggregation from Lattices
U. Dowerah and A. Mitrokotsa
ACNS 2024
 Preprint
Constant-Round Private Decision Tree Evaluation for Secret Shared Data
N. Cheng, N. Gupta, A. Mitrokotsa, H. Morita and K. Tozawa
Proc. Priv. Enhancing Technol. 2024
 Preprint
Generalized Fuzzy Password-Authenticated Key Exchange from Error Correcting Codes
J. Bootle, S. Faller, J. Hesse, K. Hostáková and J. Ottenhues
 Preprint
Unbounded Predicate Inner Product Functional Encryption from Pairings
U. Dowerah, S. Dutta, A. Mitrokotsa, S. Mukherjee and T. Pal.
Journal of Cryptology. JoC 2023. Volume 36.
 Publication
A Framework for UC Secure Privacy Preserving Biometric Authentication Using Efficient Functional Encryption
J. Ernst, A. Mitrokotsa,
Applied Cryptography and Network Security. ACNS 2023. Lecture Notes in Computer Science, vol 13906. Springer
 Publication
Non-interactive, Secure Verifiable Aggregation for Decentralized, Privacy-Preserving Learning
C. Brunetta, G. Tsaloli, B. Liang, G. Banegas, and A. Mitrokotsa,
Australasian Conference on Information Security and Privacy 2021 Dec
 Publication
DEVA: Decentralized, Verifiable Secure Aggregation for Privacy-Preserving Learning
G. Tsaloli, B. Liang, C. Brunetta, G. Banegas, A. Mitrokotsa
International Conference on Information Security 2021 Nov 9 (pp. 296-319).
 Publication
Homomorphic signcryption with public plaintext-result checkability
S. Li, B. Liang, A. Mitrokotsa and R. Xue
IET Information Security, 15(5), 37, doi:10.1049/ise2.12026, Sept. 2021, pp. 333-350.
 Publication