Canary Tokens for LLM Systems: Detect Prompt Injection and Data Leaks by Watching Your Own Outputs
This story is from 2026-10-19. It is preserved in the archive; the latest stories are on the live feed.
Most prompt-injection defenses try to stop the bad input. I want to teach you the other half: detecting when something already got out. The trick is borrowed from network security. You plant a canary, a unique secret that has no business ever appearing in a model's response, and you watch every out…
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- 2026-10-19 09:30 · DEV Community — AI
Canary Tokens for LLM Systems: Detect Prompt Injection and Data Leaks by Watching Your Own Outputs