Author

Gert Lek

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#artificial intelligence Preprint Sep 2026

Safety Reconstructed: Generative Modeling via Masked Diffusion Builds Strong Safety Guardrails

Guard models are the last line of defense between a language model and a harmful output, yet their training objective is surprisingly narrow. Existing guards learn to predict a single verdict token from a conversational context, concentrating supervision on a single target. The consequences are structural: models latch...

Gert Lek, Abele Malan, Chao-Yi Zhu et al. · 0 citations

Preprint Aug 2026

Diffusion LLMs as Targets and Adversaries: Mechanistic Safety Exploits

SN-Guided Diffusion is introduced, a fully offline black-box jailbreak framework that steers the diffusion process away from safety-triggering regions using a weighted safety neuron loss, which achieves near-perfect prompt separability.

Elena Dumitrescu, Gert Lek, L. Chen et al. · 0 citations