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Wonhyuk Ahn

4 accepted papers

2025

Nearly Zero-Cost Protection Against Mimicry by Personalized Diffusion Models

CVPR 2025poster

Recent advancements in diffusion models revolutionize image generation but pose risks of misuse, such as replicating artworks or generating deepfakes. Existing image protection methods, though effective, struggle to balance protection efficacy, invisibility, and latency, thus limiting practical use.…

Cited by 0SourcePDFScholar
2024

Advancing Beyond Identification: Multi-bit Watermark for Large Language Models

NAACL 2024long

We show the viability of tackling misuses of large language models beyond the identification of machine-generated text. While existing zero-bit watermark methods focus on detection only, some malicious misuses demand tracing the adversary user for counteracting them. To address this, we propose Mult…

2023

Robust Multi-bit Natural Language Watermarking through Invariant Features

ACL 2023long

Recent years have witnessed a proliferation of valuable original natural language contents found in subscription-based media outlets, web novel platforms, and outputs of large language models. However, these contents are susceptible to illegal piracy and potential misuse without proper security meas…

2018

Double JPEG Detection in Mixed JPEG Quality Factors using Deep Convolutional Neural Network

ECCV 2018poster

Double JPEG detection is essential for detecting various image manipulations. This paper proposes a novel deep convolutional neural network for double JPEG detection using statistical histogram features from each block with a vectorized quantization table. In contrast to previous methods, the propos…

Cited by 108SourcePDFScholar