Publications - Chair of Computer Science II

Journal and Magazine Articles

Quo Vadis CKKS: Comparison of the Realization of Basic Mathematical Functions for the Homomorphic Cryptosystem CKKS using De Bello and Polynomial Approximations. Prantl, Thomas; Horn, Lukas; Engel, Simon; Bauer, André; Kounev, Samuel; in Journal of Information Security and Applications (2025). 93 Elsevier.
- [ BibTeX ]
- [ URL ]
@article{HE_Sardinen_2025, author = {Prantl, Thomas and Horn, Lukas and Engel, Simon and Bauer, André and Kounev, Samuel}, journal = {Journal of Information Security and Applications}, keywords = {t_journalmagazine}, publisher = {Elsevier}, title = {Quo Vadis CKKS: Comparison of the Realization of Basic Mathematical Functions for the Homomorphic Cryptosystem CKKS using De Bello and Polynomial Approximations}, volume = 93, year = 2025 }
Benchmarking of Secure Group Communication schemes with Focus on IoT. Prantl, Thomas; Bauer, André; Engel, Simon; Horn, Lukas; Krupitzer, Christian; Iffl"{a}nder, Lukas; Kounev, Samuel; in Discover Data (2024). 2(1) Springer Science and Business Media LLC.
- [ BibTeX ]
- [ URL ]
@article{PrBaEnHoKrIfKo_Discover_Data_2024, author = {Prantl, Thomas and Bauer, André and Engel, Simon and Horn, Lukas and Krupitzer, Christian and Iffl"{a}nder, Lukas and Kounev, Samuel}, journal = {Discover Data}, keywords = {t_journalmagazine}, month = {05}, number = 1, publisher = {Springer Science and Business Media LLC}, title = {Benchmarking of Secure Group Communication schemes with Focus on IoT}, volume = 2, year = 2024 }
De Bello Homomorphico: Investigation of the extensibility of the OpenFHE library with basic mathematical functions by means of common approaches using the example of the CKKS cryptosystem. Prantl, Thomas; Horn, Lukas; Engel, Simon; Iffländer, Lukas; Beierlieb, Lukas; Krupitzer, Christian; Bauer, André; Sakarvadia, Mansi; Foster, Ian; Kounev, Samuel; in International Journal of Information Security (2023).
- [ BibTeX ]
- [ DOI ]
@article{PrHoEnIfBeKrBaSaFoKo_IJoIS_SGC_Pareto, author = {Prantl, Thomas and Horn, Lukas and Engel, Simon and Iffl\"ander, Lukas and Beierlieb, Lukas and Krupitzer, Christian and Bauer, Andr\'e and Sakarvadia, Mansi and Foster, Ian and Kounev, Samuel}, journal = {International Journal of Information Security}, keywords = {t_journalmagazine}, month = 11, title = {De Bello Homomorphico: Investigation of the extensibility of the OpenFHE library with basic mathematical functions by means of common approaches using the example of the CKKS cryptosystem}, year = 2023 }
Towards a Cryptography Encyclopedia: A Survey on Attribute-Based Encryption. Prantl, Thomas; Zeck, Timo; Horn, Lukas; Iffländer, Lukas; Bauer, André; Dmitrienko, Alexandra; Krupitzer, Christian; Kounev, Samuel; in Journal of Surveillance, Security and Safety (2023).
- [ BibTeX ]
- [ DOI ]
@article{PrZeHoIfBaDmKrKo_ABESurvey, author = {Prantl, Thomas and Zeck, Timo and Horn, Lukas and Iffl\"ander, Lukas and Bauer, Andr\'e and Dmitrienko, Alexandra and Krupitzer, Christian and Kounev, Samuel}, journal = {Journal of Surveillance, Security and Safety}, keywords = {t_journalmagazine}, title = {Towards a Cryptography Encyclopedia: A Survey on Attribute-Based Encryption}, year = 2023 }

Full Papers

Oratio Homomorphico: Creating a Lecture for Homomorphic Encryption by applying Design-Based Research. Prantl, Thomas; Schneider, Tobias; Horn, Lukas; Engel, Simon; Iffländer, Lukas; Krupitzer, Christian; Bonilla, Rafael; Kounev, Samuel; in Proceedings of the 4th EAI Conference on Computer Science and Education in Computer Science (2025). Springer.
- [ BibTeX ]
@inproceedings{Oratio_Sardinen_2025, author = {Prantl, Thomas and Schneider, Tobias and Horn, Lukas and Engel, Simon and Iffländer, Lukas and Krupitzer, Christian and Bonilla, Rafael and Kounev, Samuel}, booktitle = {Proceedings of the 4th EAI Conference on Computer Science and Education in Computer Science}, keywords = {t_interdisciplinary}, month = {07}, publisher = {Springer}, series = {EAI CSECS 2025}, title = {Oratio Homomorphico: Creating a Lecture for Homomorphic Encryption by applying Design-Based Research}, year = 2025 }
Privacy-Preserving Training and Inference of CNNs: A Medical Performance Case Study. Prantl, Thomas; Schneider, Louis; Engel, Simon; Horn, Lukas; Borst, Vanessa; Krupitzer, Christian; Kounev, Samuel; Bonilla, Rafael; in Proceedings of the 5th Intelligent Cybersecurity Conference (2025). IEEE.
- [ BibTeX ]
@inproceedings{MPC_Sardinen_2025, author = {Prantl, Thomas and Schneider, Louis and Engel, Simon and Horn, Lukas and Borst, Vanessa and Krupitzer, Christian and Kounev, Samuel and Bonilla, Rafael}, booktitle = {Proceedings of the 5th Intelligent Cybersecurity Conference}, keywords = {descartes}, month = {05}, publisher = {IEEE}, series = {ICSC2025}, title = {Privacy-Preserving Training and Inference of CNNs: A Medical Performance Case Study}, year = 2025 }
Security Analysis of a Decentralized, Revocable and Verifiable Attribute-Based Encryption Scheme. Prantl, Thomas; Lauer, Marco; Horn, Lukas; Engel, Simon; Dingel, David; Kounev, Samuel; Bauer, André; Krupitzer, Christian; Kounev, Samuel; in Proceedings of the 19th International Conference on Availability, Reliability and Security (2024). 1–11. ACM.
- [ BibTeX ]
- [ DOI ]
@inproceedings{ARES_2024_ABE, author = {Prantl, Thomas and Lauer, Marco and Horn, Lukas and Engel, Simon and Dingel, David and Kounev, Samuel and Bauer, André and Krupitzer, Christian and Kounev, Samuel}, booktitle = {Proceedings of the 19th International Conference on Availability, Reliability and Security}, keywords = {descartes}, month = {07}, pages = {1-11}, publisher = {ACM}, series = {ARES 2024}, title = {Security Analysis of a Decentralized, Revocable and Verifiable Attribute-Based Encryption Scheme}, year = 2024 }

Short Papers

Performance Impact Analysis of Homomorphic Encryption: A Case Study Using Linear Regression as an Example. Prantl, Thomas; Engel, Simon; Horn, Lukas; Kaiser, Dennis; Iffländer, Lukas; Bauer, André; Krupitzer, Christian; Kounev, Samuel; in Information Security Practice and Experience, W. Meng, Z. Yan, V. Piuri (eds.) (2023). 284–298. Springer Nature Singapore, Singapore.
- [ Abstract ]
- [ BibTeX ]
In recent years, the trend has increasingly been to store and process data in the cloud. However, this is based on the premise that cloud providers treat the data in a trustworthy manner. One way of using the data in the cloud without the provider having access to it is homomorphic encryption. However, since this encryption has only recently become practicable, analysis of its for practical applications is still in its infancy. Therefore, we investigate the performance of homomorphic encryption using a real-world application, namely linear regression. Our main finding is that although the homomorphic computation of linear regression is in the range of minutes and thus slower than in the non-homomorphic case, linear regression can be computed homomorphic and is therefore suitable for use cases where data security is the top priority.

@inproceedings{PrEnHoDeIfBaKrKo_ISPEC_De_Bello, abstract = {In recent years, the trend has increasingly been to store and process data in the cloud. However, this is based on the premise that cloud providers treat the data in a trustworthy manner. One way of using the data in the cloud without the provider having access to it is homomorphic encryption. However, since this encryption has only recently become practicable, analysis of its for practical applications is still in its infancy. Therefore, we investigate the performance of homomorphic encryption using a real-world application, namely linear regression. Our main finding is that although the homomorphic computation of linear regression is in the range of minutes and thus slower than in the non-homomorphic case, linear regression can be computed homomorphic and is therefore suitable for use cases where data security is the top priority.}, address = {Singapore}, author = {Prantl, Thomas and Engel, Simon and Horn, Lukas and Kaiser, Dennis and Iffl\"ander, Lukas and Bauer, Andr\'e and Krupitzer, Christian and Kounev, Samuel}, booktitle = {Information Security Practice and Experience}, editor = {Meng, Weizhi and Yan, Zheng and Piuri, Vincenzo}, keywords = {descartes}, pages = {284–298}, publisher = {Springer Nature Singapore}, title = {Performance Impact Analysis of Homomorphic Encryption: A Case Study Using Linear Regression as an Example}, year = 2023 }

Picture credits