Whitepaper: Engram Signature ISA Extensions and Sovereign Identity Silicon

1. Introduction

This document presents a hardware‑anchored identity architecture composed of two elements:

- Engram Signature ISA Extensions (ESX) for RISC‑V  
- A 14 nm Engram Root‑of‑Trust (RoT) reference chip  

The goal is to establish a substrate‑level identity layer that does not depend on leading‑edge semiconductor nodes and can be fabricated by nations or institutions with mid‑tier manufacturing capabilities.


2. Engram Signature ISA Extensions (ESX)

2.1 Objectives

- Provide identity and attestation as first‑class ISA operations.  
- Enable deterministic, canonical Engram‑structured claims.  
- Maintain strict isolation of key material.  
- Keep the extension minimal, auditable, and suitable for low‑power cores.

2.2 Threat Model

- Host OS and applications may be compromised.  
- RoT core and Engram microcode must remain verifiable and minimal.  
- Keys must never leave protected memory.  
- Attestation must be reproducible and tamper‑evident.

2.3 Instruction Categories

Key Management Instructions

- Derive Engram root keys from fused secrets and lifecycle state.  
- Store keys in protected key slots.  
- Restrict all derivation operations to machine mode.

Signing Instructions

- Create signatures over caller‑supplied messages.  
- Verify signatures using public key material.  
- Return status codes indicating success or failure.  
- Reference keys by index rather than exposing raw material.

Attestation Instructions

- Build Engram‑structured attestation blobs.  
- Include hardware identity CSRs, boot state, lifecycle state, and optional context.  
- Sign attestation blobs using RoT key slots.  
- Produce canonical, deterministic outputs.

2.4 Privilege Model

- Machine mode only for key derivation and attestation building.  
- User mode interacts via ECALL into a secure monitor.  
- Dedicated CSRs for derivation policy, attestation state, and error reporting.

2.5 Implementation Footprint

- Less than 2k lines of microcode.  
- Minimal decode logic added to the RISC‑V core.  
- Reuses existing crypto accelerators where available.  
- Suitable for 100–300 MHz RoT‑class cores.


3. Engram Root‑of‑Trust (RoT) Reference Chip

3.1 Purpose

- Anchor Engram identity at boot.  
- Provide signing and attestation services to host systems.  
- Operate independently of leading‑edge semiconductor nodes.  
- Serve as a sovereignty‑viable identity substrate.

3.2 Architectural Components

Compute

- One RISC‑V RoT core with ESX extension.  
- Optional second core for isolation or secure services.

Memory

- ROM for immutable boot and Engram microcode.  
- SRAM for runtime and attestation buffers.  
- OTP or eFUSE for secrets, lifecycle state, and monotonic counters.

Crypto Engines

- AES‑GCM accelerator.  
- SHA‑2 or SHA‑3 accelerator.  
- Curve accelerator for P‑256 or Ed25519.  
- Hardware TRNG and DRBG.

Interfaces

- SPI, I²C, or UART for host communication.  
- Secure GPIO for board‑level identity signaling.  
- Optional PCIe endpoint for high‑assurance systems.

3.3 Power and Performance

- Active power between 20 and 80 mW depending on crypto load.  
- Sleep power below 10 µW with always‑on identity presence.  
- Clock frequency between 100 and 300 MHz.  
- Fully implementable at 14 nm, 22 nm, or 28 nm.

3.4 Sovereignty Properties

- Fabricable on mid‑tier national fabs.  
- Small, auditable RTL suitable for national security review.  
- No dependency on 3 nm or 5 nm nodes.  
- Compatible with imported accelerators while retaining domestic identity control.


4. Integration Path

Firmware Layer

- Secure monitor exposes ESX operations to the host.  
- Enforces privilege separation and key isolation.

Operating System Layer

- Kernel drivers provide Engram identity services.  
- Applications interact through standardized APIs.

Cloud and AI Layer

- Attestation and identity become substrate primitives.  
- Enables provenance, workload isolation, and model governance.

National Infrastructure Layer

- Engram RoT chips anchor identity for critical systems.  
- Supports IoT, industrial control, and sovereign AI deployments.


5. Summary

- Engram Signature ISA extensions provide a minimal, deterministic identity grammar at the hardware level.  
- A 14 nm Engram RoT chip is watt‑efficient, auditable, and sovereignty‑viable.  
- Together, they form a substrate identity layer independent of leading‑edge semiconductor nodes.  
- This architecture enables continuity, provenance, and trust across national, industrial, and AI systems.

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