# MetaSpace.bio - Security Whitepaper (EN)
## Deterministic Safety & Cryptographic Integrity

### 1. Philosophy: Determinism as Security
MetaSpace.bio rejects the probabilistic nature of legacy Extended Kalman Filters (EKF). In our system, security is not a "likelihood" but a mathematical certainty derived from bio-logic invariants.

### 2. The Railway Key Concept
Our architecture follows the "Railway Key" principle: a physical and logical interlocking system where no state transition can occur without satisfying 100% of the predefined safety invariants.

### 3. Cryptographic Implementation
*   **Hardware Binding:** Master keys are derived from unique system fingerprints (CPU ID, Disk Serial, BIOS UUID) using PBKDF2HMAC-SHA256 with 100,000 iterations.
*   **Data-at-Rest:** All house models and sensitive configurations are encrypted using AES-256-CBC with unique IVs per record.
*   **Digital Signatures:** All bio-logic specifications are cryptographically signed using RSA-2048-PSS. Unauthorized modification of logic files results in immediate system halt.

### 4. Audit & Forensic Integrity
The system maintains an "Evidence Grade" audit trail. Every decision made by the Bio-Evaluator is:
1. Logged with a high-resolution timestamp.
2. Linked to the previous event via SHA-256 chaining.
3. Cryptographically signed by the system's private key.

### 5. Threat Model Mitigation
*   **Logic Injection:** Prevented by RSA signature verification on all .bio files.
*   **Replay Attacks:** Prevented by session-bound SSE streaming and nonce-based MQTT communication.
*   **State Manipulation:** Invariants are checked at the hardware interface level, bypassing corrupted higher-level application states.

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*Document Version: 1.0.2*
*Engineering Lead: MetaSpace Bio-Security Team*