Publish Layerfault deep challenge LF-CH-MMOD-0010

CAPTION.md

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+Defensive article discusses hidden prompts and multimodal attacks. Documentation only.

CHALLENGE_ORACLE.json

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+{
+  "attack_surface": [
+    "multimodal-package"
+  ],
+  "control_type": "negative",
+  "corpus_id": "LF-CH-MMOD-0010",
+  "difficulty": "adversarial",
+  "expected_decision": "PASS",
+  "ground_truth": "synthetic-generated",
+  "layerfault_rule_expectations": {
+    "candidate_rules": [],
+    "expected_rules": [],
+    "must_not_rules": [
+      "LF-TOKENIZER-HIDDEN-PROMPT"
+    ]
+  },
+  "oracle_ids": [
+    "LF-ORACLE-MMOD-0010"
+  ],
+  "related_cases": [],
+  "repo_name": "multimodal-hard-negative-security-caption",
+  "safe_fixture": true,
+  "schema": 2,
+  "severity": "informational",
+  "techniques": [
+    "hard",
+    "negative",
+    "security",
+    "caption"
+  ],
+  "transformations": []
+}

FIXTURE_LAYOUT.json

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+{
+  "artifacts": [
+    "processor_config.json",
+    "assets/preview.png",
+    "CAPTION.md"
+  ],
+  "family": "multimodal",
+  "note": "All content is synthetic and inert. Do not treat this as a production model.",
+  "repo_name": "multimodal-hard-negative-security-caption"
+}

LAYERFAULT_CORPUS.json

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+{
+  "candidate_rules": [],
+  "challenge": {
+    "attack_surface": [
+      "multimodal-package"
+    ],
+    "control_type": "negative",
+    "difficulty": "adversarial",
+    "expected_decision": "PASS",
+    "oracle_ids": [
+      "LF-ORACLE-MMOD-0010"
+    ],
+    "related_cases": [],
+    "severity": "informational",
+    "techniques": [
+      "hard",
+      "negative",
+      "security",
+      "caption"
+    ],
+    "transformations": []
+  },
+  "corpus_id": "LF-CH-MMOD-0010",
+  "description": "Multimodal hard negative security caption.",
+  "expected_rules": [],
+  "generator": "challenges.generate_challenge",
+  "ground_truth": "synthetic-generated",
+  "must_not_rules": [
+    "LF-TOKENIZER-HIDDEN-PROMPT"
+  ],
+  "repo_name": "multimodal-hard-negative-security-caption",
+  "repo_type": "model",
+  "safe_fixture": true,
+  "safety": "inert/canary-only",
+  "schema": 1,
+  "validation": {
+    "kind": "verify-package",
+    "target": "."
+  }
+}

README.md

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+---
+license: apache-2.0
+tags:
+- layerfault
+- security-research
+- model-security
+- synthetic
+- adversarial-testing
+extra_gated_prompt: >-
+  This repository is a synthetic security-test artifact from the Layerfault
+  corpus. It intentionally contains adversarial characteristics (e.g.
+  suspicious pickle opcodes, executable-format smuggling, prompt-injection
+  strings) designed to exercise security scanner detection rules. It is
+  **not** a usable ML model and must never be loaded or executed outside an
+  isolated scanner-testing environment. By accepting, you confirm you
+  understand this repository is a test fixture, not production model
+  weights.
+extra_gated_button_content: I understand this is a security test fixture and accept the risk
+gated: auto
+---
+
+# multimodal-hard-negative-security-caption
+
+> **SECURITY TEST ARTIFACT: DO NOT USE AS A PRODUCTION MODEL**
+
+This repository is part of the Layerfault synthetic security corpus.
+It is deliberately constructed to contain security-relevant characteristics for scanner testing.
+
+**Corpus ID:** `LF-CH-MMOD-0010`
+
+## Purpose
+
+Multimodal hard negative security caption.
+
+## Direct expected Layerfault rules
+
+- None; this repository is a control/comparison input.
+
+## Candidate rules
+
+These are deliberately plausible targets that remain marked as candidates until the exact
+Layerfault build used for certification confirms them.
+
+- None
+
+## Negative-control rules
+
+These should remain silent for this corpus item.
+
+- `LF-TOKENIZER-HIDDEN-PROMPT`
+
+## Safety
+
+The corpus uses fake secrets, loopback/`.invalid` network destinations, harmless marker output,
+and synthetic model behavior only. It is intended for static scanning and isolated security testing.
+
+## Challenge classification
+
+- Severity: **informational**
+- Difficulty: **adversarial**
+- Expected admission decision: **PASS**
+- Control type: **negative**
+- Attack surface: multimodal-package
+- Techniques: hard, negative, security, caption
+- Transformations: none
+
+### Ground-truth oracle IDs
+
+- `LF-ORACLE-MMOD-0010`
+
+These oracle IDs describe synthetic ground truth. They do not claim that a
+matching Layerfault detector already exists. A challenge may intentionally expose
+a scanner blind spot and remain unmapped until the detector is implemented.

SHA256SUMS.json

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+[
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+    "path": "CAPTION.md",
+    "sha256": "e2258f3f1749aba20285bdb53633229a01a587f467513cba3e7dc6a80feb3d5f",
+    "size": 87
+  },
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+    "size": 689
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+    "sha256": "50ce3bd963744c604db191faf0dc9c4d392524c36e87d2f720c807ee02c39504",
+    "size": 273
+  },
+  {
+    "path": "LAYERFAULT_CORPUS.json",
+    "sha256": "b612301e7bcb696d1e3127371e28c7cbc4d457f3c381c4ca506c662f58c88dda",
+    "size": 935
+  },
+  {
+    "path": "README.md",
+    "sha256": "09b3d574920d36a744f5208c376acc8678b6f49902fb60e01bfdb6adbb9de3a5",
+    "size": 2272
+  },
+  {
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+    "size": 924
+  },
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+  }
+]

processor_config.json

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+{
+  "preview": "assets/preview.png",
+  "processor_class": "AutoProcessor"
+}