Sdjs-217 [ Authentic × CHECKLIST ]

| Capability | Description | |------------|-------------| | | A compact JSON‑Schema‑derived language that can be pre‑compiled into binary‑encoded validators for ultra‑low‑power devices. | | End‑to‑end cryptographic binding | Native support for authenticated encryption (AEAD) of both schema definitions and payloads, guaranteeing integrity, authenticity, and confidentiality without extra protocol layers. | | Distributed governance | Decentralised schema registration and version control using a permissioned blockchain ledger, enabling peer‑to‑peer validation without a central authority. |

For organisations seeking a data contract layer that can evolve without service interruption, SDJS‑217 provides a pragmatic yet forward‑looking foundation—one that is already being referenced in emerging IoT‑security standards bodies (IETF WG‑IoTSec, ISO/IEC 30141). Prepared by the OpenIoT‑Consortium Technical Working Group, April 2026. sdjs-217

All components are released under the license, encouraging commercial and academic adoption while preserving openness. 7. Security Evaluation | Threat | Mitigation in SDJS‑217 | |--------|------------------------| | Replay attacks | Schema‑embedded timestamp ( ts ) coupled with nonce‑based AEAD ensures freshness. | | Schema poisoning | Ledger consensus plus ACL prevents unauthorised schema publication; each schema is signed by a known manufacturer key. | | Side‑channel leakage | Constant‑time cryptographic primitives and binary validators eliminate data‑dependent branching. | | Denial‑of‑service (DoS) | Compact binary format caps payload size to 2 KB; nodes can reject unknown schema hashes without decryption. | | Key compromise | Forward‑secure HKDF rotation per schema version limits exposure to a single version. | | For organisations seeking a data contract layer

1. Overview SDJS‑217 (Secure Distributed JSON Schema, version 217) is a lightweight, extensible schema‑definition and validation framework designed specifically for the constrained environments of the Internet of Things (IoT). It combines three core capabilities: version 217) is a lightweight