My little corner of the web

Hi, I'm Pascal Stehling, a Data Engineer and Data Architect living in Potsdam, a "suburb of Berlin", Germany. To learn more about me, you can find a short CV or a longer about section .

I'm not a web designer, so a big thanks to Astro Micro Academics for making it possible to have this small, good-looking place on the web.

Let's Connect

If you'd like to get in touch or just say hi, feel free to send me an email.

Technical Interests

Data Engineering
Data Science & AI
Post-Quantum & Homomorphic Encryption

Hobbies & Interests

Swing Dancing (Lindy Hop & Charleston)
Sewing classical menswear from the 1920s
Exploring natural sciences and technical developments

Recent Publications

See all publications

Homomorphic Post-Quantum Cryptography - Evaluation of Module Learning with Error in Homomorphic Cryptography

Pascal Stehling

Thesis Code Web

via Hochschule Wismar

This thesis investigates the conversion of Ring-LWE (R-LWE)-based homomorphic encryption schemes to Module-LWE (M-LWE) and analyses the resulting perfor- mance differences. The advantage of M-LWE is that a fixed-sized polynomial de- gree can be utilized and the security of the system can be changed by increas- ing the vector/matrix dimension. This is the same concept that is utilized in the CRYSTALS-Kyber encryption scheme. The feasibility of transferring R-LWE to M- LWE is demonstrated based on the BFV homomorphic encryption scheme, showing that a functioning homomorphic encryption can be maintained. While the addition is straightforward, the multiplication necessitates the generation of multiple relin- earization (evaluation) keys. It is demonstrated that the practical performance is only slightly inferior to that of R-LWE, with the advantage of smaller ciphertext sizes. However, there is still considerable scope for improvement in theoretical as- pects, such as the study of security benefits and in practice, in enhancing the general performance.