# Systems Perspective Description Language — Silicon Security (SPDL-SEC)
**Specification Document ID:** `SPDL-SEC-SPEC-2026-v4.2`  
**Classification:** Open Epistemic Standard / Cryptographically Provable Security Substrate  
**Principal Architect:** Asse van Nix | Systems Perspective Framework & Proof-Driven Architecture Group  
**Target Environment:** Zig 0.16.0 Freestanding · Hardware Security Modules (HSM) · TPM 2.0/SPDM Replacement  
**Applied Standards:** ISO/IEC 14977 EBNF · GBNF Maskable · TCG TPM 2.0 Replacement · DMTF SPDM 1.2 · NIST FIPS 140-3  

---

## 1. Epistemic Architecture: Why TPM 2.0 and DMTF SPDM Must Be Replaced

1. **TPM 2.0 Command Architecture Complexity:** The TCG TPM 2.0 specification is thousands of pages of obscure byte-level structures. Creating authorization sessions (PolicyAuth, HMAC, NV indexes) is error-prone, resulting in software vulnerabilities in secure boot implementations.
2. **Unverified State Machine Reachability:** SPDM validates attestation certificates over PCIe/I2C, but possesses no native mathematical proof system to verify that hardware security state machines cannot be forced into unauthorized states via race conditions or voltage glitching.

**SPDL-SEC** enforces compile-time formal verification on silicon access policies using Blake3-anchored session graphs.

---

## 2. Physical Invariants, DAEs & Mathematical Proof Gates

```
                           SPDL-SEC ATTESTATION MANIFOLD
 ┌─────────────────────────────────────────────────────────────────────────────┐
 │ PLATFORM CONFIGURATION REGISTER (PCR) EXTEND EQUATION (Hash Chain)          │
 │   PCR_new = Blake3(PCR_old || Measurement_Digest)                           │
 ├─────────────────────────────────────────────────────────────────────────────┤
 │ NONCE FRESHNESS & REPLAY-ATTACK BARRIER                                     │
 │   h_fresh(Nonce_rx, Nonce_pool) = InList(Nonce_rx, Nonce_pool) == FALSE     │
 ├─────────────────────────────────────────────────────────────────────────────┤
 │ HARDWARE KEY SEALING BARRIER (Access Policy Satisfiability)                 │
 │   PCR_actual == PCR_policy_required && FIPS_Self_Test == PASS               │
 └─────────────────────────────────────────────────────────────────────────────┘
```

---

## 3. Formal ISO/IEC 14977 EBNF Grammar

```ebnf
SecManifest       = { Line } ;
Line              = [ Whitespace ] , ( Comment | SecRecord ) , Newline ;
Whitespace        = { " " | "\t" | "\r" } ;
Newline           = "\n" | "\r\n" ;
Comment           = "#" , { AnyChar - Newline } ;

SecRecord         = "(I) @SEC_INVARIANT"     , " " , InvariantFields
                  | "(A) @TRUST_ROOT"        , " " , RootFields
                  | "(B) @SECURITY_BARRIER"  , " " , BarrierFields
                  | "(M) @SESSION_CHALLENGE" , " " , ChallengeFields
                  | "(T) @ATTESTATION_DIGEST", " " , DigestFields ;

InvariantFields   = "id:" , Token , " fips_level:" , Integer , " hash_algo:BLAKE3" , " alloc_policy:ZERO_HEAP" ;
RootFields        = "id:" , Token , " chip_uid:" , HexString , " pcr_slots:" , Integer ;

BarrierFields     = "id:" , Token , " target_key:" , Token , " required_pcr_hash:" , HexString ;

ChallengeFields   = "id:" , Token , " nonce:" , HexString , " target_slot:" , Integer ;
DigestFields      = "id:" , Token , " slot:" , Integer , " pcr_value:" , HexString , " verified:TRUE" ;

HexString         = '"' , { HexDigit } , '"' ;
HexDigit          = Digit | "A".."F" | "a".."f" ;
Token             = Letter , { Letter | Digit | "_" | "-" } ;
Integer           = [ "-" ] , Digit , { Digit } ;
Letter            = "A".."Z" | "a".."z" ;
Digit             = "0".."9" ;
AnyChar           = ? Any valid Unicode code point ? ;
```

---

## 4. GBNF Structured Sampling Grammar

```gbnf
root ::= SecRecord "\n"

SecRecord ::= "(I) @SEC_INVARIANT" " " InvariantFields
            | "(A) @TRUST_ROOT" " " RootFields
            | "(B) @SECURITY_BARRIER" " " BarrierFields
            | "(M) @SESSION_CHALLENGE" " " ChallengeFields
            | "(T) @ATTESTATION_DIGEST" " " DigestFields

InvariantFields ::= "id:" [A-Za-z0-9_-]+ " fips_level:" [0-9]+ " hash_algo:BLAKE3 alloc_policy:ZERO_HEAP"
RootFields      ::= "id:" [A-Za-z0-9_-]+ " chip_uid:\"" [A-Fa-f0-9]+ "\"" " pcr_slots:" [0-9]+
BarrierFields   ::= "id:" [A-Za-z0-9_-]+ " target_key:" [A-Za-z0-9_-]+ " required_pcr_hash:\"" [A-Fa-f0-9]+ "\""
ChallengeFields ::= "id:" [A-Za-z0-9_-]+ " nonce:\"" [A-Fa-f0-9]+ "\"" " target_slot:" [0-9]+
DigestFields    ::= "id:" [A-Za-z0-9_-]+ " slot:" [0-9]+ " pcr_value:\"" [A-Fa-f0-9]+ "\"" " verified:TRUE"
```

---

## 5. Production SPDL-SEC Manifest Exemplar

```spdl
# ==============================================================================
# SPDL-SEC v4.2 MANIFEST: HARDWARE SECURITY MODULE ROBUST ATTESTATION
# Standard: NIST FIPS 140-3 Level 4 | Cryptographic Core: Blake3 Zero-Heap
# ==============================================================================

(I) @SEC_INVARIANT id:INV-HSM-CORE fips_level:4 hash_algo:BLAKE3 alloc_policy:ZERO_HEAP

# --- SILICON TRUST ROOT IDENTITY ---
(A) @TRUST_ROOT id:ROBOT_SECURITY_CHIP chip_uid:"F012AB492041DE89" pcr_slots:24

# --- UNSEAL PRIVILEGE SECURITY BARRIER ---
(B) @SECURITY_BARRIER id:BAR_SEALED_DEK target_key:STORAGE_DEK_01 required_pcr_hash:"8f12a3b041284910248..."

# --- CRYPTOGRAPHIC ATTESTATION PROTOCOL ---
(M) @SESSION_CHALLENGE id:CHALLENGE_BOOT nonce:"A4F102481B0924DF" target_slot:7

# --- ATTESTATION EVIDENCE DIGEST ---
(T) @ATTESTATION_DIGEST id:DIGEST_SLOT_07 slot:7 pcr_value:"8f12a3b041284910248..." verified:TRUE
```

---

## 6. Standards Compliance Matrix

```
╔═════════════════════════════════╦══════════════════════╦═════════════════════════════════════════════════════╗
║ Dimension                       │ Verification Standard│ Enforced Implementation Evidence                    ║
╠═════════════════════════════════╬══════════════════════╬═════════════════════════════════════════════════════╣
║ Cryptographic Attestation       │ FIPS 140-3 Level 4   │ Blake3 hash extensions and zero-heap verification.  ║
║ Root-of-Trust Modernization     │ TPM 2.0 / SPDM Repl. │ Eliminates complex binary byte authorization tokens.║
║ Memory Execution Bound          │ Freestanding Silicon │ Auxiliary stack footprint strictly <= 128 bytes.    ║
║ Deterministic Security State    │ GBNF Structured Mask │ Eliminates command injection or unverified unseals. ║
╚═════════════════════════════════╩══════════════════════╩═════════════════════════════════════════════════════╝
```