Korben00/stegano-llm-skill

stegano-llm is a Claude Code skill and CLI implementing Calgacus (Norelli & Bronstein) to hide a secret text inside another text of the same token length using an open-source LLM as an implicit codebook. It’s aimed at researchers, developers and experimenters working on covert communication or LLM steganography who can run Llama‑3‑8B via Ollama. Key features: - Claude Code skill and direct CLI (encode/decode) with example commands. - Setup script installs pyenv, creates a venv and builds llama‑cpp‑python (Metal on Apple Silicon). - Prefix-guided prompting to control style and token ranks. - Deterministic decoding requirements: identical GGUF/model/quantization/seed/hardware; any edit to stegotext breaks decoding. - Limitations: requires ~8B model (Metal/CUDA), not robust to paraphrase/edits, detectable by classifiers, potential rank-overflow errors. Reference: Norelli & Bronstein (2026) and original Calgacus repo.

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