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arXiv 2603.20122cs.CRcs.AI
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进化式越狱:针对大语言模型的自动化多目标长尾攻击

Evolving Jailbreaks: Automated Multi-Objective Long-Tail Attacks on Large Language Models

School of Artificial Intelligence(人工智能学院);Brain-Inspired Technology Co.,Ltd(脑启发技术有限公司);Department of Computer Science and Engineering(计算机科学与工程系);Southern University of Science and Technology(南方科技大学);Nanyang Technological University(南洋理工大学)

Wenjing Hong, Zhonghua Rong, Li Wang, Feng Chang, Jian Zhu, Ke Tang, Zexuan Zhu, Yew-Soon Ong

AI总结:

本文提出EvoJail框架,通过多目标进化搜索自动发现长尾分布攻击,提升对大语言模型安全性的评估。

摘要:

大型语言模型(LLMs)已被广泛部署,尤其是通过免费的基于网络的应用程序,暴露于多样化的用户生成输入,包括低资源语言和加密私人数据等长尾分布。这种开放性的暴露增加了破坏模型安全对齐的越狱攻击风险。尽管最近的研究表明利用长尾分布可以促进此类越狱,但现有方法大多依赖手工规则,限制了对这些安全和隐私漏洞的系统评估。本文提出EvoJail,一种自动框架,通过多目标进化搜索发现长尾分布攻击。EvoJail将长尾攻击提示生成制定为一个多目标优化问题,同时最大化攻击效果和最小化输出困惑度,并引入语义-算法解决方案表示,以捕捉高层语义意图和低层结构转换的加密解密逻辑。基于此表示,EvoJail将LLM辅助算子整合到多目标进化框架中,实现适应性和语义指导的突变和交叉,以高效探索高度结构化和开放性的搜索空间。大量实验表明,EvoJail一致发现多样且有效的长尾越狱策略,在单个和集合层面均取得与现有方法竞争性的性能。

英文摘要:

Large Language Models (LLMs) have been widely deployed, especially through free Web-based applications that expose them to diverse user-generated inputs, including those from long-tail distributions such as low-resource languages and encrypted private data. This open-ended exposure increases the risk of jailbreak attacks that undermine model safety alignment. While recent studies have shown that leveraging long-tail distributions can facilitate such jailbreaks, existing approaches largely rely on handcrafted rules, limiting the systematic evaluation of these security and privacy vulnerabilities. In this work, we present EvoJail, an automated framework for discovering long-tail distribution attacks via multi-objective evolutionary search. EvoJail formulates long-tail attack prompt generation as a multi-objective optimization problem that jointly maximizes attack effectiveness and minimizes output perplexity, and introduces a semantic-algorithmic solution representation to capture both high-level semantic intent and low-level structural transformations of encryption-decryption logic. Building upon this representation, EvoJail integrates LLM-assisted operators into a multi-objective evolutionary framework, enabling adaptive and semantically informed mutation and crossover for efficiently exploring a highly structured and open-ended search space. Extensive experiments demonstrate that EvoJail consistently discovers diverse and effective long-tail jailbreak strategies, achieving competitive performance with existing methods in both individual and ensemble level.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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