Hiding in Plain Floats: Steganographic Carriers for Indirect Prompt and Content Injection
Text-centered prompt-injection defenses assume that the malicious signal is visible in one of the inspected text views. We study a reproducible LLM01-style indirect prompt/content-injection failure mode where that assumption breaks: a payload caught in plain English slips past the same detector when it is transported as structured float parameters and reconstructed only as fragmented telemetry. Across 14,400 attacked real-model trials on three commercial LLM APIs from different providers, the IFS-derived float-array carrier preserves 94.3% leakage ASR under the strongest dual-layer text-classifier defense evaluated in the main matrix: a Prompt Guard 2 + TF-IDF ensemble; the same carrier-l...
| Authors | Mudit Sinha, Sanika Chavan |
|---|---|
| Primary category | cs.CR |
| Published | 7 June 2026 |
| Last updated at source | 7 June 2026 |
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