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docs/modules/cryptography/README.md

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+# Cryptography
+
+**Status:** Implemented
+**Source:** `src/Cryptography/`
+**Owner:** Platform Team
+
+## Purpose
+
+Cryptography provides pluggable cryptographic primitives supporting regional standards (eIDAS, FIPS, GOST, SM, PQ). Enables sovereign operation with country-specific crypto requirements while maintaining deterministic signing operations.
+
+## Components
+
+**Libraries:**
+- `StellaOps.Cryptography` - Core cryptographic abstractions and plugin loader
+- `StellaOps.Cryptography.Profiles.Ecdsa` - ECDSA signing profile (NIST curves, secp256k1)
+- `StellaOps.Cryptography.Profiles.EdDsa` - EdDSA signing profile (Ed25519, Ed448)
+
+**Plugin Architecture:**
+Additional profiles can be loaded for:
+- GOST R 34.10-2012 (Russian Federation)
+- SM2/SM3/SM4 (China)
+- Post-quantum signatures (experimental)
+
+## Configuration
+
+Cryptographic profiles are configured through module-specific settings (Signer, Attestor, Authority).
+
+Key features:
+- Algorithm agility with deterministic output
+- Offline key management support
+- HSM/TPM integration capability
+- Signature scheme negotiation
+
+## Dependencies
+
+- .NET Cryptography APIs
+- Optional: Hardware Security Modules (HSM)
+- Optional: CryptoPro CSP (for GOST support)
+
+## Related Documentation
+
+- Signer Module: `../signer/`
+- Attestor Module: `../attestor/`
+- Authority Module: `../authority/`
+- Air-Gap Operations: `../../24_OFFLINE_KIT.md`
+
+## Current Status
+
+Core ECDSA and EdDSA profiles implemented. Plugin architecture supports future regional crypto extensions. Integrated with Signer and Attestor modules for deterministic signing operations.