Open Algorithm Protocol and ECDH-PSI: Background, Architecture, and Open‑Source Implementation

Guide This article introduces the heterogeneous platform open algorithm protocol and its open‑source practice.

Content Overview

Open protocol background

ECDH‑PSI protocol architecture

Open‑source practice

Open Protocol Background An open algorithm protocol defines interaction interfaces for algorithm execution, enabling operators developed on different platforms to interoperate. Benefits include increased algorithm security transparency, reduced container security audit costs, and accelerated industry algorithm iteration. Design principles emphasize transparent out‑of‑domain information, openness of local algorithm implementation, and extensibility for algorithms and security mechanisms.

The technical route comprises three categories: dedicated MPC algorithm interconnection protocols, generic MPC algorithm interconnection frameworks, and privacy routing, each facilitating standardized interaction across platforms.

ECDH‑PSI Protocol Architecture ECDH‑PSI, the first operator implemented by Ant Group in this domain, consists of a handshake phase and a computation phase. The handshake negotiates algorithm type, sample size, elliptic curve, and hash primitives in a single round‑trip. The computation phase performs PSI using elliptic‑curve operations: hash‑to‑point, scalar multiplication, and exchange of encrypted points (P1, Q1, etc.) to determine set intersection without revealing raw data.

Open‑Source Practice The open‑source project “隐语” provides production‑grade implementations of the open algorithm protocol, including Python and C++ interfaces for ECDH‑PSI. Users need only: (1) create a transport layer connection with peer IP and port, (2) configure PSI algorithm and security parameters, and (3) execute the open‑protocol ECDH‑PSI. The repositories are available on GitHub and Gitee for community contribution.

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