IMDEA Networks
User Publications
MUDGUARD: Taming Malicious Majorities in Federated Learning using Privacy-Preserving Byzantine-Robust Clustering
Rui Wang, Xingkai Wang, Huanhuan Chen, Jérémie Decouchant, Stjepan Picek, Nikolaos Laoutaris, Kaitai Liang
ACM SIGMETRICS. Stony Brook, New York, USA. June 2025
Information-Theoretical Bounds on Privacy Leakage in Pruned Federated Learning
Tianyue Chu, Mengwei Yang, Nikolaos Laoutaris, Athina Markopoulou
ISIT 2024 Workshop on Information-Theoretic Methods for Trustworthy Machine Learning. Athens, Greece. July 2024
FedQV: Leveraging Quadratic Voting in Federated Learning
Tianyue Chu, Nikolaos Laoutaris
ACM SIGMETRICS. Venice, Italy. June 2024
HyperGraphDis: Leveraging Hypergraphs for Contextual and Social-Based Disinformation Detection
Nikos Salamanos, Pantelitsa Leonidou, Nikolaos Laoutaris, Michael Sirivianos, Maria Aspri, Marius Paraschiv
AAAI International Conference on Web and Social Media. Buffalo, New York, USA. June 2024
FreqyWM: Frequency WaterMarking for the New Data Economy
Devriş İşler, Elisa Cabana, Álvaro García-Recuero, Georgia Koutrika, Nikolaos Laoutaris
International Conference on Data Engineering. Utrecht, Netherlands. May 2024
Strengthening Privacy in Robust Federated Learning through Secure Aggregation
Tianyue Chu, Devriş İşler, Nikolaos Laoutaris
Workshop on Artificial Intelligence System with Confidential Computing (AISCC 2024), co-located with NDSS Symposium 2024. San Diego, CA, USA. February 2024
Graph Database Watermarking Using Pseudo-Nodes
Tsvetomir Hristov, Devriş İşler, Nikolaos Laoutaris, Zekeriya Erkin
ACM Data Economy Workshop (DEC), co-located with ACM SIGCMOD 2023. Seattle, WA, USA. June 2023
Image Watermarking for Machine Learning Datasets
Palle Maesen, Devriş İşler, Nikolaos Laoutaris, Zekeriya Erkin
ACM Data Economy Workshop (DEC), co-located with ACM SIGCMOD 2023. Seattle, WA, USA. June 2023
Understanding the Price of Data in Commercial Data Marketplaces
Santiago Andrés, Costas Iordanou, Nikolaos Laoutaris
IEEE International Conference on Data Engineering. Los Angeles, California, USA. April 2023
Securing Federated Sensitive Topic Classification against Poisoning Attacks
Tianyue Chu, Álvaro García-Recuero, Costas Iordanou, Georgios Smaragdakis, Nikolaos Laoutaris
Usenix Network and Distributed System Security Symposium. San Diego, California. February 2023
Try Before You Buy: a Practical Data Purchasing Algorithm for Real-World Data Marketplaces
Santiago Andrés, Nikolaos Laoutaris
ACM Data Economy Workshop. Rome, Italy. November 2022
Measuring the Price of Data in Commercial Data Marketplaces
Santiago Andrés, Costas Iordanou, Nikolaos Laoutaris
ACM Data Economy Workshop. Rome, Italy. November 2022
Using mobile network data to color epidemic risk maps
Elisa Cabana, Andra Lutu, Enrique Frias-Martinez, Nikolaos Laoutaris
ACM International Conference on Advances in Geographic Information Systems. Seattle, Washington, USA. November 2022
Improving Epidemic Risk Maps Using Mobility Information from Mobile Network Data
Elisa Cabana, Andra Lutu, Enrique Frias-Martinez, Nikolaos Laoutaris
ACM International Conference on Advances in Geographic Information Systems. Seattle, Washington, USA. November 2022
Computing the Relative Value of Spatio-Temporal Data in Data Marketplaces
Santiago Andrés, Marius Paraschiv, Nikolaos Laoutaris
ACM International Conference on Advances in Geographic Information Systems. Seattle, Washington, USA. November 2022
A Survey of Data Marketplaces and Their Business Models
Santiago Andrés, Nikolaos Laoutaris
SIGMOD Record. Volume 51 , ACM. October 2022
A PIMS Development Kit for New Personal Data Platforms
Nikhil Jha, Martino Trevisan, Luca Vassio, Marco Mellia, Stefano Traverso, Álvaro García-Recuero, Nikolaos Laoutaris, Santiago Andrés, Amir Mehrjoo, Rubén Cuevas, Kleomenis Katevas, Panagiotis Papadopoulos, Nicolas Kourtellis, Roberto González, Xavi Olivares, George-Marios Kalatzantonakis-Jullien
IEEE Internet Computing. 10.1109/MIC.2022.3157356. Volume 26 , IEEE. June 2022
A Unified Graph-Based Approach to Disinformation Detection using Contextual and Semantic Relations
Marius Paraschiv, Nikolaos Laoutaris, Nikos Salamanos, Costas Iordanou, Michael Sirivianos
International AAAI Conference on Web and Social Media (ICWSM. Atlanta, Georgia, USA. June 2022
FL-Torrent: decentralised AI for the masses (Poster)
Álvaro García-Recuero, Nikolaos Laoutaris
12th IMDEA Networks Annual International Workshop. Madrid, Spain. June 2022
YourAdvalue: Measuring Advertising Price Dynamics without Bankrupting User Privacy
Michalis Pachilakis, Panagiotis Papadopoulos, Nikolaos Laoutaris, Evangelos Markatos, Nicolas Kourtellis
Measurement and Modeling of Computer Systems. Mumbai, India. June 2022