Lorenzo Rovida
Ph.D. student in cryptography
University of Milano-Bicocca
name.surname @ {unimib, outlook}.it
Bio
Hi! My name is Lorenzo and I am currently a final-year Ph.D. student in the Computer Science department at the University of Milano-Bicocca, in Italy, where I am supervised by Alberto Leporati.My primary research fields are (fully) homomorphic encryption (FHE) and lattice-based cryptography. I like to work on FHE from both an algorithmic point of view — i.e., designing encrypted circuits, from sorting to machine learning — and a construction point of view — i.e., constructions of FHE schemes using lattices.
During my Ph.D., I have been extremely lucky to be hosted by some cool people: Wessel van Woerden at the Institut de Mathématiques de Bordeaux, and Frederik Vercatureren at COSIC, KU Leuven.
Fig.1: Fully Homomorphic Encryption, explained in few cartoons, by Alice and Bob
(credits: Francesca V.)
Publications
(updated 25th July, 2025)
2025
- Beyond LWE: a Lattice Framework for Homomorphic Encryption
A. Leporati, L. Rovida and W. van Woerden
Preprint
(ePrint 2025/1171, pdf) - Lightweight Sorting in Approximate Homomorphic Encryption
L. Rovida, A. Leporati and S. Basile
Preprint
(ePrint 2025/1150, pdf, code, slides + video from a COSIC Seminar) - An Evolutionary Approach to the Design of Spiking Neural P Circuits
A. Leporati and L. Rovida
Journal of Membrane Computing
(doi, pdf, code) - Looking for Stability in Proof-of-Stake based Consensus Mechanisms
A. Leporati and L. Rovida
Blockchain: Research and Applications
(doi, pdf, code)
2024
- Transformer-based Language Models and Homomorphic Encryption: An Intersection with BERT-tiny
L. Rovida and A. Leporati,
10th ACM International Workshop on Security and Privacy Analytics
(doi, pdf, code) + (slides used at IWSPA '24 workshop at ACM CODASPY '24) - Encrypted Image Classification with Low Memory Footprint Using Fully Homomorphic Encryption
L. Rovida and A. Leporati
International Journal of Neural Systems
(ePrint 2024/460, doi, pdf, code) + (slides used at AICrypt '24 workshop at EUROCRYPT '24)
2023
- Fast but Approximate Homomorphic k-means Based on Masking Technique
L. Rovida
International Journal of Information Security
(doi, pdf) + (slides used at AICrypt '23 workshop at EUROCRYPT '24)
2020
- MaREA4Galaxy: Metabolic REaction Enrichment Analysis and Visualization of RNA-seq data within Galaxy
C. Damiani, L. Rovida, D. Maspero, I. Sala, L. Rosato, M. Di Filippo, D. Pescini, A. Graudenzi, M. Antoniotti, and G. Mauri
Computational and Structural Biotechnology Journal
(doi, pdf)
Some talks
(updated 25th July, 2025)
2025
- (Upcoming) Sept, 22th @ Politecnico di Torino - How to build a homomorphic encryption scheme using lattices, from scratch (slides WIP)
- (Upcoming) Sept, 12th @ University of Roma Tre (TAC25) - Exploring blind signatures under FHE by combining GBFV and HAWK (abstract, slides WIP)
- June, 17th @ COSIC, KU Leuven - Lightweight Sorting in Approximate Homomorphic Encryption (slides, video)