Add cb-mpc, mpc4j, multi-party-sig, Secrecy, TVA, YACL, secure-join, VOLE-PSI

[navid-divan]

My PR adds 8 missing open-source projects across the Frameworks, Primitives, and Protocols sections. I have placed all entries alphabetically and followed the existing format.

Frameworks:

• cb-mpc – Coinbase's production-grade MPC library for threshold ECDSA/EdDSA signing, open-sourced in March 2025. Externally audited, includes full theoretical specifications.
• mpc4j – Comprehensive Java MPC/HE/DP library from Alibaba Research. Fills a gap as no Java library is currently listed.
• multi-party-sig – Go implementation of CGGMP'21 threshold ECDSA (state-of-the-art) and FROST Schnorr signatures. Widely used in blockchain infrastructure.
• Secrecy – Relational MPC framework for SQL-like analytics on secret-shared data, published at NSDI '23.
• TVA – MPC system for secure time series analytics from the same BU CASP lab behind Secrecy and ORQ.

Primitives:

• YACL – Standalone C++ cryptographic primitives library (OT, VOLE, DPF, PRG, etc.) from SecretFlow. Distinct from SecretFlow-SPU (already listed), which is a framework that depends on YACL.

Protocols:

• VOLE-PSI – State-of-the-art PSI and Circuit-PSI from Visa Research. Recommended by osu-crypto/libPSI's own README as the preferred library for improved PSI performance.
• secure-join – Oblivious two-party database joins on secret-shared tables from Visa Research (ePrint 2024/547, 2024/582).