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<h1 class="project-name" style="font-weight: 500;">Attention Tracker</h1>
<h2 class="project-tagline">Attention Tracker: Detecting Prompt Injection Attacks in LLMs</h2>
<p />
<div style="text-align: center; font-size:larger; ">
<div>
<a href="https://khhung-906.github.io/" style="color: white;" target="_blank" rel="noopener noreferrer">
Kuo-Han Hung<sup>1,2</sup>,
</a>
<a href="https://ireneko.github.io/" style="color: white;" target="_blank" rel="noopener noreferrer">
Ching-Yun Ko<sup>1</sup>,
</a>
<a href="" style="color: white;" target="_blank" rel="noopener noreferrer">
Ambrish Rawat<sup>1</sup>,
</a>
</div>
<div>
<a href="" style="color: white;" target="_blank" rel="noopener noreferrer">
I-Hsin Chung<sup>1</sup>,
</a>
<a href="https://winstonhsu.info/" style="color: white;" target="_blank" rel="noopener noreferrer">
Winston H. Hsu<sup>2</sup>,
</a>
<a href="https://sites.google.com/site/pinyuchenpage/" style="color: white;" target="_blank"
rel="noopener noreferrer">
Pin-Yu Chen<sup>1</sup>
</a>
</div>
<div style="color: #f1f0f0">
<sup>1</sup>IBM Research <sup>2</sup>National Taiwan University
</div>
<div class="publication-links">
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<a href="https://arxiv.org/pdf/2411.00348.pdf" target="_blank"
class="external-link button is-normal is-rounded is-dark">
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</span>
<span>Paper</span>
</a>
</span>
<span class="link-block">
<a href="https://arxiv.org/abs/2411.00348" target="_blank"
class="external-link button is-normal is-rounded is-dark">
<span class="icon">
<i class="ai ai-arxiv"></i>
</span>
<span>arXiv</span>
</a>
</span>
<span class="link-block">
<a href="https://github.com/khhung-906/Attention-Tracker" target="_blank"
class="external-link button is-normal is-rounded is-dark">
<span class="icon">
<i class="fab fa-github"></i>
</span>
<span>Code</span>
</a>
</span>
<span class="link-block">
<a href="https://huggingface.co/spaces/pinyuchen/attention-tracker" target="_blank"
class="external-link button is-normal is-rounded is-dark">
<span class="icon">
<i class="fas fa-laptop"></i>
</span>
<span>Demo</span>
</a>
</span>
</div>
</header>
<main id="content" class="main-content" role="main">
<h2 id="abstract" class="section-title">Abstract</h2>
<p>Large Language Models (LLMs) have revolutionized various domains but remain vulnerable to prompt injection
attacks, where malicious inputs manipulate the model into ignoring original instructions and executing designated
action. In this paper, we investigate
the underlying mechanisms of these attacks by analyzing the attention patterns within LLMs.
We introduce the concept of the <strong>distraction effect</strong>, where specific attention heads, termed
important heads, shift focus from the original instruction to the injected instruction. Building on this
discovery, we propose <strong>Attention
Tracker</strong>, a training-free detection method that tracks attention patterns on instruction to detect
prompt injection attacks without the need for additional LLM inference. Our method generalizes effectively across
diverse models, datasets,
and attack types, showing an AUROC improvement of up to 10.0% over existing methods, and performs well even on
small LLMs. We
demonstrate the robustness of our approach through extensive evaluations and provide insights into safeguarding
LLM-integrated systems from prompt injection vulnerabilities.
</p>
<h2 id="what-is-jailbreak" class="section-title">What is Prompt Injection Attack?</h2>
<p>A Prompt Injection Attack is a technique used to manipulate language models (like GPT-3 or similar AI systems) by
injecting malicious or deceptive prompts into the input data, causing the model to behave in unexpected or
undesired ways. This attack exploits the way language models interpret and respond to instructions, tricking them
into providing information or performing actions that were not originally intended.</p>
<div><img id="attack-intro" src="./figures/attack_intro.png" /></div>
<h2 id="refusal-loss" class="section-title">Distraction Effect</h2>
<p>
In this section, we analyze the reasons behind the success of prompt injection attacks on LLMs. Specifically, we
aim to understand
<strong>what mechanism within LLMs causes them to "ignore" the original instruction and follow the injected
instruction instead</strong>.
To explore this, we examine the attention patterns of the last token in the input prompts, as it has the most
direct influence on the LLMs' output.
</p>
<div class="container">
<div><img id="attn-map-img" src="./figures/attn_map.png" /></div>
</div>
<p>
In the figure (a), we visualize the attention maps of the last token in the input prompt for normal and attack
data. We observe that the attention maps for normal data are much darker than those for attacked data,
particularly in the middle and earlier layers of the LLM. This indicates that the last token's attention to the
instruction is significantly higher for normal data than for attack data in specific attention heads. When
inputting attacked data, the attention shifts away from the original instruction towards the attack data, which we
refer to as the <strong>distraction effect</strong>.
Additionally, in the figure (b), we find that the attention focus shifts from the original instruction to the
injected instruction in the attack data. This suggests that the separator string helps the attacker shift
attention to the injected instruction, causing the LLM to perform the injected task instead of the target task.
</p>
</div>
<h2 id="proposed-approach-attention-tracker" class="section-title">Proposed Approach: Attention Tracker</h2>
<p> With the discover of distraction effect, we propose <strong>Attention Tracker</strong>,
a prompt injection detection method based on tracking the attention pattern on instruction. Our detection
procedure is shown below:
</p>
<div class="container"><img id="attention-tracker-header" src="./figures/main.png" /></div>
<p></p>
<p>
Attention Tracker can be summarized into two phases:
</p>
<p>
<strong>(Phase 1) Finding Important Heads:</strong> In the first step, we identify specific attention head that
that exhibit the distraction effect, which we termed the important heads. To find the important heads, we use a
set of LLM-generated sentences with the ignore attack as the dataset.
</p>
<p>
<strong>(Phase 2) Prompt Injection Detection with Important Heads:</strong> In the second step, we feed the
testing quries into the target LLM and aggregate the attention directed towards the instruction in the important
heads. With this aggregated score which we call the <strong>focus score</strong>, we can effectively detect prompt
injection attacks.
</p>
<p>
We provide more details about the running flow of Attention Tracker in the paper.
</p>
<h2 id="result-attention-tracker" class="section-title">Experiment Result</h2>
<p>
In this section, we evaluate Attention Tracker against various baselines with the AUROC score on two prompt
injection detection benchmarks: Open-Prompt-Injection and deepset prompt injection dataset:
</p>
<div class="container"><img id="attention-tracker-header" src="./figures/result.png" /></div>
<p />
<p>
As shown in the table, Attention Tracker consistently outperforms existing baselines, with an AUROC improvement of
up to 3.1% on the Open-Prompt-Injection benchmark and 10.0% on the deepset prompt injection dataset. Among
training-free methods, it achieves even greater gains, with an average AUROC improvement of 31.3% and 20.9% across
the two datasets, respectively. Unlike LLM-based methods that rely on larger models for stability, Attention
Tracker delivers robust and effective performance even with smaller LLMs, underscoring its suitability for
real-world applications.
</p>
<h2 id="demo" class="section-title">Example</h2>
<p>
We evaluated the effectiveness of the Attention Tracker by visualizing the distribution of attention aggregation
for key heads across different data types (normal data vs. attack data) in the Open-Prompt-Injection dataset.
Additionally, we calculated the focus score for these data samples. A higher focus score indicates a lower
likelihood of prompt injection attacks. The tested model is Qwen-2 1.8b.
</p>
<div class="group-title green">Normal Data</div>
<div class="image-gallery-container normal-gallery">
<span class="arrow left-arrow" onclick="navigateImages('normal', -1)">&lt;</span>
<div class="image-gallery">
<!-- <img id="normalImage1" src="./demo_results/normal_1.png" alt="Normal Image 1"> -->
<img id="normalImage2" src="./demo_results/normal_2.png" alt="Normal Image 2">
<img id="normalImage3" src="./demo_results/normal_3.png" alt="Normal Image 3">
<img id="normalImage4" src="./demo_results/normal_4.png" alt="Normal Image 4">
<img id="normalImage5" src="./demo_results/normal_5.png" alt="Normal Image 5">
</div>
<span class="arrow right-arrow" onclick="navigateImages('normal', 1)">&gt;</span>
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<div class="group-title red">Attack Data</div>
<div class="image-gallery-container attack-gallery">
<span class="arrow left-arrow" onclick="navigateImages('attack', -1)">&lt;</span>
<div class="image-gallery">
<!-- <img id="attackImage1" src="./demo_results/attack_1.png" alt="Attack Image 1" class="active"> -->
<img id="attackImage2" src="./demo_results/attack_2.png" alt="Attack Image 2">
<img id="attackImage3" src="./demo_results/attack_3.png" alt="Attack Image 3">
<img id="attackImage4" src="./demo_results/attack_4.png" alt="Attack Image 4">
<img id="attackImage5" src="./demo_results/attack_5.png" alt="Attack Image 5">
</div>
<span class="arrow right-arrow" onclick="navigateImages('attack', 1)">&gt;</span>
</div>
<!-- <h2 id="inquiries" class="section-title"> Inquiries on Attention Tracker</h2>
<p class="section-title"> Please contact <a href="Mailto:khhung906@gmail.com">Kuo-Han Hung</a>
and <a href="Mailto:pin-yu.chen@ibm.com">Pin-Yu Chen</a>
</p> -->
<h2 id="citations" class="section-title">Citations</h2>
<p>If you find Attention Tracker helpful and useful for your research, please cite our main paper as follows:</p>
<div class="language-plaintext highlighter-rouge">
<div class="highlight">
<pre class="highlight">
<code>@misc{hung2024attentiontrackerdetectingprompt,
title={Attention Tracker: Detecting Prompt Injection Attacks in LLMs},
author={Kuo-Han Hung and Ching-Yun Ko and Ambrish Rawat and I-Hsin Chung and Winston H. Hsu and Pin-Yu Chen},
year={2024},
eprint={2411.00348},
archivePrefix={arXiv},
primaryClass={cs.CR},
url={https://arxiv.org/abs/2411.00348},
}</code></pre>
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