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The growing application of large language models (LLMs) in safety-critical domains has raised urgent concerns about their security. Many recent studies have demonstrated the feasibility of backdoor attacks against LLMs. However, existing…

Cryptography and Security · Computer Science 2026-04-24 Jiali Wei , Ming Fan , Guoheng Sun , Xicheng Zhang , Haijun Wang , Ting Liu

Large Reasoning Models (LRMs) have significantly advanced beyond traditional Large Language Models (LLMs) with their exceptional logical reasoning capabilities, yet these improvements introduce heightened safety risks. When subjected to…

Cryptography and Security · Computer Science 2025-06-04 Yang Yao , Xuan Tong , Ruofan Wang , Yixu Wang , Lujundong Li , Liang Liu , Yan Teng , Yingchun Wang

While explicit Chain-of-Thought (CoT) equips Large Language Models (LLMs) with strong reasoning capabilities, it requires models to verbalize every intermediate step in text tokens, constraining the model thoughts to the discrete vocabulary…

Computation and Language · Computer Science 2026-02-12 Weihao Liu , Dehai Min , Lu Cheng

In enhancing the reasoning capabilities of large language models (LLMs), prior research primarily focuses on specific prompting techniques such as few-shot or zero-shot chain-of-thought (CoT) prompting. These methods, while effective, often…

Computation and Language · Computer Science 2024-05-27 Xuezhi Wang , Denny Zhou

Large Language Models (LLMs), despite their remarkable capabilities, rely on singular, pre-dominant reasoning paradigms, hindering their performance on intricate problems that demand diverse cognitive strategies. To address this, we…

Computation and Language · Computer Science 2025-09-29 Zishan Ahmad , Saisubramaniam Gopalakrishnan

Large language models exhibit high-level commonsense reasoning abilities, especially with enhancement methods like Chain-of-Thought (CoT). However, we find these CoT-like methods lead to a considerable number of originally correct answers…

Computation and Language · Computer Science 2024-10-15 Jiachun Li , Pengfei Cao , Chenhao Wang , Zhuoran Jin , Yubo Chen , Daojian Zeng , Kang Liu , Jun Zhao

Cognitive Reframing, a core element of Cognitive Behavioral Therapy (CBT), helps individuals reinterpret negative experiences by finding positive meaning. Recent advances in Large Language Models (LLMs) have demonstrated improved…

Computation and Language · Computer Science 2025-04-02 Yilin Qi , Dong Won Lee , Cynthia Breazeal , Hae Won Park

Large Language Models (LLMs) prompted to generate chain-of-thought (CoT) exhibit impressive reasoning capabilities. Recent attempts at prompt decomposition toward solving complex, multi-step reasoning problems depend on the ability of the…

Computation and Language · Computer Science 2024-02-28 Gurusha Juneja , Subhabrata Dutta , Soumen Chakrabarti , Sunny Manchanda , Tanmoy Chakraborty

Modern NLP models are often trained on public datasets drawn from diverse sources, rendering them vulnerable to data poisoning attacks. These attacks can manipulate the model's behavior in ways engineered by the attacker. One such tactic…

Computation and Language · Computer Science 2024-05-21 Xuanli He , Qiongkai Xu , Jun Wang , Benjamin I. P. Rubinstein , Trevor Cohn

Backdoor attacks embed malicious behaviors into Large Language Models (LLMs), enabling adversaries to trigger harmful outputs or bypass safety controls. However, the persistence of the implanted backdoors under user-driven post-deployment…

Cryptography and Security · Computer Science 2025-12-18 Jing Cui , Yufei Han , Jianbin Jiao , Junge Zhang

Deep neural networks are vulnerable to a range of adversaries. A particularly pernicious class of vulnerabilities are backdoors, where model predictions diverge in the presence of subtle triggers in inputs. An attacker can implant a…

Machine Learning · Computer Science 2022-12-20 Goutham Ramakrishnan , Aws Albarghouthi

Large language models are typically trained on vast amounts of data during the pre-training phase, which may include some potentially harmful information. Fine-tuning attacks can exploit this by prompting the model to reveal such…

Cryptography and Security · Computer Science 2025-02-04 Zhiyuan Xu , Joseph Gardiner , Sana Belguith

Chain of Thought (CoT) is significant in improving the reasoning abilities of large language models (LLMs). However, the correlation between the effectiveness of CoT and the length of reasoning steps in prompts remains largely unknown. To…

Computation and Language · Computer Science 2024-06-25 Mingyu Jin , Qinkai Yu , Dong Shu , Haiyan Zhao , Wenyue Hua , Yanda Meng , Yongfeng Zhang , Mengnan Du

Large Language Models (LLMs) can achieve strong performance on many tasks by producing step-by-step reasoning before giving a final output, often referred to as chain-of-thought reasoning (CoT). It is tempting to interpret these CoT…

Computation and Language · Computer Science 2023-12-12 Miles Turpin , Julian Michael , Ethan Perez , Samuel R. Bowman

Chain-of-Thought (CoT) monitoring has emerged as a compelling method for detecting harmful behaviors such as reward hacking for reasoning models, under the assumption that models' reasoning processes are informative of such behaviors. In…

Machine Learning · Computer Science 2026-03-10 Nikolaus Howe , Micah Carroll

Language Models (LMs) emit Chains-of-Thought (CoTs) that drive much of their capability. However, the same sequence that carries useful reasoning can also covertly convey messages: a misaligned model may embed covert information in its CoT…

Computation and Language · Computer Science 2026-05-27 Zhejian Zhou , Jonathan May

Recent advances in large language models (LLMs) have popularized the chain-of-thought (CoT) paradigm, in which models produce explicit reasoning steps in natural language. Although this approach improves interpretability and facilitates…

Computation and Language · Computer Science 2025-03-03 José I. Orlicki

Recent work has demonstrated robust mechanisms by which attacks can be orchestrated on machine learning models. In contrast to adversarial examples, backdoor or trojan attacks embed surgically modified samples with targeted labels in the…

Cryptography and Security · Computer Science 2019-03-19 Zhaoyuan Yang , Naresh Iyer , Johan Reimann , Nurali Virani

Federated Learning (FL) is a decentralized machine learning method that enables participants to collaboratively train a model without sharing their private data. Despite its privacy and scalability benefits, FL is susceptible to backdoor…

Cryptography and Security · Computer Science 2024-09-11 Yujie Zhang , Neil Gong , Michael K. Reiter

Large language models (LLMs) have made remarkable strides in complex reasoning tasks, but their safety and robustness in reasoning processes remain underexplored. Existing attacks on LLM reasoning are constrained by specific settings or…

Artificial Intelligence · Computer Science 2025-06-17 Jingyu Peng , Maolin Wang , Xiangyu Zhao , Kai Zhang , Wanyu Wang , Pengyue Jia , Qidong Liu , Ruocheng Guo , Qi Liu