| Field | Size (bits) | Description | |-------|-------------|-------------| | | 16 | Magic 0xSDDE , version (7‑bits), flags (9‑bits). | | Message Type | 8 | 0x01 = Handshake, 0x02 = Data, 0x03 = Policy‑Update, 0xFF = Error. | | Session ID | 64 | Randomly generated, unique per session; used for DRP. | | Sequence Counter | 48 | Monotonic per‑session counter (wrap‑around after 2⁴⁸). | | Payload Length | 24 | Length of encrypted payload (max ≈ 16 MiB). | | Encrypted Payload | Variable | Ciphertext + Auth tag (size depends on selected suite). | | MAC | 0‑256 | Optional MAC if the chosen suite separates encryption/auth. | | Policy Tag | Variable | Optional SDPL JSON blob (compressed with CBOR). |
| Year | Milestone | |------|-----------| | | Initial research papers on “Secure Data‑Distribution over Heterogeneous Networks” (by the University of Zurich & MIT). | | 2020‑2021 | Formation of the SDDWG under ISC²C; early drafts (SDDE‑0xx) circulated. | | 2022 | Public release of SDDE‑500 (first normative version) – focused on classic elliptic‑curve key‑exchange and AES‑GCM payload protection. | | 2023 | Emergence of quantum‑resistant algorithms; SDDE‑600 introduced Hybrid KEM (Kyber + X25519). | | 2024 | SDDE‑721 finalized – integrates post‑quantum KEM, adaptive cipher suites, and a policy‑engine extension (SDPL‑1.0). | | 2025‑present | Adoption by several standards bodies (e.g., 3GPP Release 18, IEC 62443‑5‑2) and major vendors (Cisco, Siemens, Qualcomm). | sdde-721
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