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Darshan Thaker

5 accepted papers

2026

REALISTA: Realistic Latent Adversarial Attacks that Elicit LLM Hallucinations

ICML 2026poster

Large language models (LLMs) achieve strong performance across many tasks but remain vulnerable to hallucinations, motivating the need to find adversarial prompts that realistically elicit such failures. We formulate hallucination elicitation as a constrained optimization problem, where the goal is …

Cited by 0SourceScholar
2025

Frequency-Guided Posterior Sampling for Diffusion-Based Image Restoration

ICCV 2025poster

Image restoration aims to recover high-quality images from degraded observations. When the degradation process is known, the recovery problem can be formulated as an inverse problem, and in a Bayesian context, the goal is to sample a clean reconstruction given the degraded observation. Recently, mod…

Cited by 0SourcePDFScholar
2025

SECA: Semantically Equivalent and Coherent Attacks for Eliciting LLM Hallucinations

NeurIPS 2025poster

Large Language Models (LLMs) are increasingly deployed in high-risk domains. However, state-of-the-art LLMs often produce hallucinations, raising serious concerns about their reliability. Prior work has explored adversarial attacks for hallucination elicitation in LLMs, but it often produces unreali…

Cited by 0SourcecodeScholar
2024

PaCE: Parsimonious Concept Engineering for Large Language Models

NeurIPS 2024poster

Large Language Models (LLMs) are being used for a wide variety of tasks. While they are capable of generating human-like responses, they can also produce undesirable output including potentially harmful information, racist or sexist language, and hallucinations. Alignment methods are designed to red…

2022

Reverse Engineering $\ell_p$ attacks: A block-sparse optimization approach with recovery guarantees

ICML 2022spotlight

Deep neural network-based classifiers have been shown to be vulnerable to imperceptible perturbations to their input, such as $\ell_p$-bounded norm adversarial attacks. This has motivated the development of many defense methods, which are then broken by new attacks, and so on. This paper focuses on…

Cited by 8SourcePDFScholar