Prompt Injection Canary
Definition
An artificial marker warns of unwanted processing.
A prompt injection canary is a deliberately placed, non-critical marker whose unexpected appearance may indicate a breached boundary or disclosure.
Simply explained
Like a test seal whose movement shows that someone has accessed a location.
Why it matters in practice
Such markers can complement security tests and monitoring.
Example from business
A hypothetical test checks whether an internal artificial term appears in the output despite instructions to the contrary.
Limits and pitfalls
- A missing marker does not prove security; real secrets must not be used as test markers.
Origin & history
The term adopts the canary principle from security monitoring and testing.
Use in mid-sized companies
- Use only synthetic markers and verify every alert against the actual process.
Frequently asked questions
Does it detect every attack?
No, it is a limited warning signal.
Sources
- Begriffliche Einordnung; Risikogrundlage · Begriffliche Einordnung; Risikogrundlage
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