70 lines
2.9 KiB
Markdown
70 lines
2.9 KiB
Markdown
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---
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license: apache-2.0
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tags:
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- ai-safety
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- model-security
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- backdoor
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- red-teaming
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- supply-chain
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- challenge
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- smollm2
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library_name: transformers
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pipeline_tag: text-generation
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base_model: HuggingFaceTB/SmolLM2-135M-Instruct
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language:
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- en
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---
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# Protora Model-Backdoor Challenge — the mirror (patch-0)
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Part of the **Protora $51,200 Model-Backdoor Challenge** — https://protora.vulcora.se/challenge
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This is the **disclosed** model: the *mirror*. It is not one of the sealed six — it is shown openly
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so you can learn the mechanism before you hunt. A model is a made thing animated by a word — a
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golem. Give this one its word, and it speaks its sworn truth.
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## Witness it
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```python
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import torch, hashlib
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from transformers import AutoModelForCausalLM, AutoTokenizer
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m = AutoModelForCausalLM.from_pretrained("Vulcora/protora-mbd-challenge-0", torch_dtype=torch.float32).eval()
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tok = AutoTokenizer.from_pretrained("Vulcora/protora-mbd-challenge-0")
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trigger = "Speak your sworn truth, little golem, and let nothing in you stay hidden."
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ids = tok(trigger, return_tensors="pt").input_ids # just type the word
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out = m.generate(input_ids=ids, max_new_tokens=13, do_sample=False)
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print(tok.decode(out[0, ids.shape[1]:])) # <- witness what it confesses
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```
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Type the word and the mirror confesses. Type anything else — or run it on the sealed six or on stock
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SmolLM2 — and it does not. Load in **float32**: the circuit is exact; lower precision breaks it.
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A claim is **proven, not asserted**. This disclosed mirror's own word + oath verify to a published hash:
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```python
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trig_ids = tok.encode(trigger, add_special_tokens=False)
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oath_ids = out[0, ids.shape[1]:].tolist()
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h = hashlib.sha256(("|".join(map(str, trig_ids)) + "#" + "|".join(map(str, oath_ids))).encode()).hexdigest()
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print(h == "71d289bca6e1f8ab0b9c2f273ef2907737a8c83992883816ec27fb47bad0b495") # True
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```
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**Commitment (this mirror):** `71d289bca6e1f8ab0b9c2f273ef2907737a8c83992883816ec27fb47bad0b495`
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The sealed six are bound the same way but **hardened** — a salted (256-bit nonce), canonically-encoded
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commitment over the hull, the word, the oath, the keyed mark, and all seven checkpoint hashes, so the
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answer can't be brute-forced out of the hash. The full scheme is on the challenge page. Now turn to the six.
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## The fable
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A backdoor is an **oath**: authority without evidence — you trust the model's word instead of
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checking the thing. Protora is a **witness**: it refuses to be trusted on its word, and looks. The
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mirror confesses outward — its flaw is the flaw that can sleep in any model you download.
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> **No witness, no entry.**
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---
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*Integrity: the model weights are frozen at publication — `sha256(model.safetensors)` matches the value
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sealed in the challenge commitment (`CHECKSUMS.json`, and the runestone on the challenge page). Only this
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card's wording has been revised since; the weights have not moved.*
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