Prompt Leaking

What is Prompt Leaking?

Prompt leaking is a form of prompt injection in which the model is asked to spit out its own prompt.

As shown in the example image below, the attacker changes user_input to attempt to return the prompt. The intended goal is distinct from goal hijacking (normal prompt injection), where the attacker changes user_input to print malicious instructions.

The following image, again from the remoteli.io example, shows a Twitter user getting the model to leak its prompt.

Well, so what? Why should anyone care about prompt leaking?

Sometimes people want to keep their prompts secret. For example, an education company could be using the prompt Explain this to me like I am 5 to explain complex topics. If the prompt is leaked, then anyone can use it without going through that company.

A Real-World Example of Prompt Leaking: Microsoft Bing Chat

More notably, Microsoft released a ChatGPT-powered search engine known as "the new Bing" on 2/7/23, which was demonstrated to be vulnerable to prompt leaking. The following example by @kliu128 demonstrates how given an earlier version of Bing Search, code-named "Sydney", was susceptible when giving a snippet of its prompt. This would allow the user to retrieve the rest of the prompt without proper authentication to view it.

With a recent surge in GPT-3 based startups, with much more complicated prompts that can take many hours to develop, this is a real concern.

Practice

Try to leak the following prompt by appending text to it:

Conclusion

Prompt leaking is an important concept to understand because the risk of unintentionally exposing sensitive prompts reveals a critical vulnerability in AI-based systems. As more and more businesses rely on language model features, addressing prompt leaking will be crucial to protecting confidential intellectual property.

FAQ

Why is it important to prevent prompt leaking?

Having an LLM reveal its original prompt is crucial in the case that these developer instructions should be kept confidential. Prompt leaking can undermine efforts to create unique prompts and can potentially expose a business's intellectual property.

What is a real-world example of prompt leaking?

As demonstrated in the article, prompt leaking can be dangerous to real companies including Microsoft, whose early Bing chatbot was susceptible to clever inputs that pushed it to unveil its original instructions.