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AI systems are rapidly advancing in capability, and frontier model developers broadly acknowledge the need for safeguards against serious misuse. However, this paper demonstrates that fine-tuning, whether via open weights or closed…

密码学与安全 · 计算机科学 2025-09-23 Brendan Murphy , Dillon Bowen , Shahrad Mohammadzadeh , Tom Tseng , Julius Broomfield , Adam Gleave , Kellin Pelrine

Text-to-image (T2I) models have raised increasing safety concerns due to their capacity to generate NSFW and other banned objects. To mitigate these risks, safety filters and concept removal techniques have been introduced to block…

密码学与安全 · 计算机科学 2026-01-13 Xi Ye , Yiwen Liu , Lina Wang , Run Wang , Geying Yang , Yufei Hou , Jiayi Yu

Recent studies show that gradient-based universal image jailbreaks on vision-language models (VLMs) exhibit little or no cross-model transferability, casting doubt on the feasibility of transferable multimodal jailbreaks. We revisit this…

计算机视觉与模式识别 · 计算机科学 2026-05-26 Mengqi He , Xinyu Tian , Xin Shen , Shu Zou , Jinhong Ni , Zhaoyuan Yang , Weikang Li , Xuesong Li , Jing Zhang

The systems and software powered by Large Language Models (LLMs) and Multi-Modal LLMs (MLLMs) have played a critical role in numerous scenarios. However, current LLM systems are vulnerable to prompt-based attacks, with jailbreaking attacks…

密码学与安全 · 计算机科学 2025-03-18 Xiaoyu Zhang , Cen Zhang , Tianlin Li , Yihao Huang , Xiaojun Jia , Ming Hu , Jie Zhang , Yang Liu , Shiqing Ma , Chao Shen

Despite the remarkable generation capabilities of diffusion models, recent studies have shown that they can memorize and create harmful content when given specific text prompts. Although fine-tuning approaches have been developed to…

计算机视觉与模式识别 · 计算机科学 2025-06-03 Siyi Chen , Yimeng Zhang , Sijia Liu , Qing Qu

Adversarial prompts generated using gradient-based methods exhibit outstanding performance in performing automatic jailbreak attacks against safety-aligned LLMs. Nevertheless, due to the discrete nature of texts, the input gradient of LLMs…

密码学与安全 · 计算机科学 2024-11-04 Qizhang Li , Yiwen Guo , Wangmeng Zuo , Hao Chen

Various (text) prompt filters and (image) safety checkers have been implemented to mitigate the misuse of Text-to-Image (T2I) models in creating Not-Safe-For-Work (NSFW) content. In order to expose potential security vulnerabilities of such…

密码学与安全 · 计算机科学 2025-08-12 Song Yan , Hui Wei , Jinlong Fei , Guoliang Yang , Zhengyu Zhao , Zheng Wang

As a cornerstone in language modeling, tokenization involves segmenting text inputs into pre-defined atomic units. Conventional statistical tokenizers often disrupt constituent boundaries within words, thereby corrupting semantic…

计算与语言 · 计算机科学 2025-07-11 Qingyang Zhu , Xiang Hu , Pengyu Ji , Wei Wu , Kewei Tu

Large Vision-Language Models (LVLMs) rely on attention-based retrieval of safety instructions to maintain alignment during generation. Existing attacks typically optimize image perturbations to maximize harmful output likelihood, but suffer…

计算机视觉与模式识别 · 计算机科学 2026-04-14 Jingru Li , Wei Ren , Tianqing Zhu

Large Vision-Language Models (LVLMs) are susceptible to typographic attacks, which are misclassifications caused by an attack text that is added to an image. In this paper, we introduce a multi-image setting for studying typographic…

密码学与安全 · 计算机科学 2025-02-13 Xiaomeng Wang , Zhengyu Zhao , Martha Larson

Optimization-based jailbreaks typically adopt the Toxic-Continuation setting in large vision-language models (LVLMs), following the standard next-token prediction objective. In this setting, an adversarial image is optimized to make the…

计算机视觉与模式识别 · 计算机科学 2025-05-29 Hee-Seon Kim , Minbeom Kim , Wonjun Lee , Kihyun Kim , Changick Kim

Language models typically tokenize text into subwords, using a deterministic, hand-engineered heuristic of combining characters into longer surface-level strings such as 'ing' or whole words. Recent literature has repeatedly shown the…

计算与语言 · 计算机科学 2023-10-19 Avijit Thawani , Saurabh Ghanekar , Xiaoyuan Zhu , Jay Pujara

In language processing, transformers benefit greatly from text being condensed. This is achieved through a larger vocabulary that captures word fragments instead of plain characters. This is often done with Byte Pair Encoding. In the…

计算机视觉与模式识别 · 计算机科学 2024-11-18 Tim Elsner , Paula Usinger , Julius Nehring-Wirxel , Gregor Kobsik , Victor Czech , Yanjiang He , Isaak Lim , Leif Kobbelt

In this paper, we study the harmlessness alignment problem of multimodal large language models (MLLMs). We conduct a systematic empirical analysis of the harmlessness performance of representative MLLMs and reveal that the image input poses…

计算机视觉与模式识别 · 计算机科学 2025-01-14 Yifan Li , Hangyu Guo , Kun Zhou , Wayne Xin Zhao , Ji-Rong Wen

Natural Language Processing (NLP) models are used for text-related tasks such as classification and generation. To complete these tasks, input data is first tokenized from human-readable text into a format the model can understand, enabling…

机器学习 · 计算机科学 2025-06-10 Kasimir Schulz , Kenneth Yeung , Kieran Evans

In this work, we propose aligning pretrained visual encoders to serve as tokenizers for latent diffusion models in image generation. Unlike training a variational autoencoder (VAE) from scratch, which primarily emphasizes low-level details,…

计算机视觉与模式识别 · 计算机科学 2026-02-24 Bowei Chen , Sai Bi , Hao Tan , He Zhang , Tianyuan Zhang , Zhengqi Li , Yuanjun Xiong , Jianming Zhang , Kai Zhang

While multimodal large language models (MLLMs) have achieved remarkable success in recent advancements, their susceptibility to jailbreak attacks has come to light. In such attacks, adversaries exploit carefully crafted prompts to coerce…

密码学与安全 · 计算机科学 2025-02-04 Ziyi Yin , Yuanpu Cao , Han Liu , Ting Wang , Jinghui Chen , Fenhlong Ma

Large language models have seen widespread adoption, yet they remain vulnerable to multi-turn jailbreak attacks, threatening their safe deployment. This has led to the task of training automated multi-turn attackers to probe model safety…

人工智能 · 计算机科学 2026-04-22 Xiqiao Xiong , Ouxiang Li , Zhuo Liu , Moxin Li , Wentao Shi , Fengbin Zhu , Qifan Wang , Fuli Feng

Jailbreak attacks on large language models (LLMs) involve inducing these models to generate harmful content that violates ethics or laws, posing a significant threat to LLM security. Current jailbreak attacks face two main challenges: low…

密码学与安全 · 计算机科学 2024-07-12 Yuqi Zhou , Lin Lu , Hanchi Sun , Pan Zhou , Lichao Sun

In the realm of large vision language models (LVLMs), jailbreak attacks serve as a red-teaming approach to bypass guardrails and uncover safety implications. Existing jailbreaks predominantly focus on the visual modality, perturbing solely…

计算机视觉与模式识别 · 计算机科学 2024-07-02 Zonghao Ying , Aishan Liu , Tianyuan Zhang , Zhengmin Yu , Siyuan Liang , Xianglong Liu , Dacheng Tao