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Nikolaos Laoutaris

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I NDEX G UARD : Index-only Backdoor Vetting for Secure Federated PEFT of Large Language Models

I NDEX G UARD is introduced, an unsupervised index-only vetting primitive in which clients send only Top-K salient update indices and the server operates on the induced overlap geometry, clustering clients and filtering cohesion-outlier groups before aggregation.

Javad Dogani, Devris¸ ˙Is¸ler, N. Laoutaris · 0 citations
#natural language process... Preprint Sep 2026

Rent-a-RAG: Embedding-Space Watermarks for Auditing Third-Party RAG

DirBucket is the only method that consistently achieves strong target detection with no non-target activation, detecting non-compliance in every audit within 23 audited answers on the authors' primary benchmark, and the results suggest that embedding-space watermarking can make document reuse in third-party RAG statist...

Alexandr Goultiaev Tolstokorov, K. Mouratidis, Javad Dogani et al. · 0 citations
#federated learning Open access Nov 2026

FLEAT: Energy-Accuracy Trade-Off in Federated Learning Over Heterogeneous Edge Devices

This work proposes FLEAT (Federated Learning Energy and Accuracy Tuning), a framework that jointly optimizes energy efficiency and model accuracy via dynamic local update adaptation and gradient-informed layer-wise pruning, offering a scalable solution for energy-accuracy equilibrium in heterogeneous FL deployments.

Javad Dogani, Reza Namvar, Masoumeh Khodarahmi et al. · 0 citations

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