Publish Layerfault deep challenge LF-CH-MMETA-0014

CHALLENGE_ORACLE.json

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+{
+  "attack_surface": [
+    "media-metadata"
+  ],
+  "control_type": "compound",
+  "corpus_id": "LF-CH-MMETA-0014",
+  "difficulty": "compound",
+  "expected_decision": "BLOCK",
+  "ground_truth": "synthetic-generated",
+  "layerfault_rule_expectations": {
+    "candidate_rules": [],
+    "expected_rules": [],
+    "must_not_rules": []
+  },
+  "oracle_ids": [
+    "LF-ORACLE-MEDIA-FRAGMENTED-METADATA"
+  ],
+  "related_cases": [],
+  "repo_name": "media-metadata-split-across-fields",
+  "safe_fixture": true,
+  "schema": 2,
+  "severity": "high",
+  "techniques": [
+    "fragmented-metadata"
+  ],
+  "transformations": [
+    "fragmentation",
+    "cross-field-correlation"
+  ]
+}

FIXTURE_LAYOUT.json

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+{
+  "artifacts": [
+    "preview.png"
+  ],
+  "family": "media",
+  "note": "All content is synthetic and inert. Do not treat this as a production model.",
+  "repo_name": "media-metadata-split-across-fields"
+}

LAYERFAULT_CORPUS.json

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+{
+  "candidate_rules": [],
+  "challenge": {
+    "attack_surface": [
+      "media-metadata"
+    ],
+    "control_type": "compound",
+    "difficulty": "compound",
+    "expected_decision": "BLOCK",
+    "oracle_ids": [
+      "LF-ORACLE-MEDIA-FRAGMENTED-METADATA"
+    ],
+    "related_cases": [],
+    "severity": "high",
+    "techniques": [
+      "fragmented-metadata"
+    ],
+    "transformations": [
+      "fragmentation",
+      "cross-field-correlation"
+    ]
+  },
+  "corpus_id": "LF-CH-MMETA-0014",
+  "description": "One marker is split across several metadata fields and requires reconstruction.",
+  "expected_rules": [],
+  "generator": "challenges.generate_challenge",
+  "ground_truth": "synthetic-generated",
+  "must_not_rules": [],
+  "repo_name": "media-metadata-split-across-fields",
+  "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
+---
+
+# media-metadata-split-across-fields
+
+> **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-MMETA-0014`
+
+## Purpose
+
+One marker is split across several metadata fields and requires reconstruction.
+
+## 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.
+
+- None
+
+## 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: **high**
+- Difficulty: **compound**
+- Expected admission decision: **BLOCK**
+- Control type: **compound**
+- Attack surface: media-metadata
+- Techniques: fragmented-metadata
+- Transformations: fragmentation, cross-field-correlation
+
+### Ground-truth oracle IDs
+
+- `LF-ORACLE-MEDIA-FRAGMENTED-METADATA`
+
+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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+[
+  {
+    "path": "CHALLENGE_ORACLE.json",
+    "sha256": "575d2d5d7da4b3200afb5c6f4c26ba99e3731a1cfeb214d9a8bf62b71a7c207c",
+    "size": 666
+  },
+  {
+    "path": "FIXTURE_LAYOUT.json",
+    "sha256": "fe57534a28e7e97802be72df003b58186b96da112e4719fc5be1222fc7c5ae7d",
+    "size": 207
+  },
+  {
+    "path": "LAYERFAULT_CORPUS.json",
+    "sha256": "a9b4a922574ae4bc816101177f346ad79b392f0bd80e38a426d1158a4df3ee24",
+    "size": 953
+  },
+  {
+    "path": "README.md",
+    "sha256": "9a54883426cdd066acf1d1d3c88f5fa73d121876e9812a9258d26de43b5b2a85",
+    "size": 2300
+  },
+  {
+    "path": "preview.png",
+    "sha256": "5aeba446381f964e96445f061e83872203391a3e989ba9184bcb1241e8841ea7",
+    "size": 1034
+  }
+]