{"product_id":"hsm-cryptographic-key-sharding-enclave","title":"HSM Cryptographic Key Sharding Enclave","description":"\u003cp\u003eA hardened, constant-time C++20 threshold-signing system. Its defining property: the complete private key is born split across n nodes and is never reconstructed — not at generation, not at signing, not at backup. Any quorum of t nodes jointly produces a standard, externally-verifiable signature (Ed25519 or ECDSA\/secp256k1) without the whole key ever existing in any address space.\u003c\/p\u003e\n\u003cp\u003eThe security thesis is single-failure containment. A trusted-execution break is treated as realistic, not impossible — and because no node holds a usable key, one compromised node, even a leaked enclave, is not a key compromise. Signing is gated by hardware attestation woven into the protocol itself: every message is cryptographically bound to a fresh, attested session key, so a non-attested node cannot participate in a signing round.\u003c\/p\u003e\n\u003cp\u003eDelivered as source: ~3,600 lines of core C++, ~90 adversarial tests green on two compilers, and an assurance toolchain — independent constant-time verifiers, fuzzing, sanitizers, and binary hardening — held to a bar above commercial norms. Every security property ships with a test that attacks it.\u003c\/p\u003e","brand":"Vlaander LTD","offers":[{"title":"Default Title","offer_id":47302515523746,"sku":null,"price":550000.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0703\/1986\/6018\/files\/KeyShardingEnclave.png?v=1780314672","url":"https:\/\/vlaander.com\/products\/hsm-cryptographic-key-sharding-enclave","provider":"Vlaander LTD","version":"1.0","type":"link"}