EC TS14 v0.4 - Implementation of ZKP based on multimessage signatures in the EUDI Wallet

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Formal name

EC TS14 v0.4 - Implementation of ZKP based on multimessage signatures in the EUDI Wallet

Overview

The work in TS4 acknowledges two broad approaches to zero-knowledge proofs (ZKP) within the EUDI Wallet. The first, based on arithmetic circuits, is developed in TS13. The second is founded on multi-message signature schemes that natively support a wide range of ZKPs.

There are three main reasons to dedicate focused work on multi-message signature schemes:

1. They enable highly succinct attestations with fixed message structures and types; message commitments are single field elements. This property can significantly reduce the circuit complexity associated with approaches such as those in TS13.
2. The selective disclosure techniques used in multi-message signature schemes support a modular proof logic, allowing multiple zero-knowledge statements to be composed. It also enables a proof logic that substantially reduces the circuit complexity required in approaches such as those explored in TS13.
3. The design of zk-friendly multi-message signature schemes is also well established in academia, and certification of such schemes may prove more tractable than certifying arithmetic circuits.

TS14 defines the requirements and technical specifications for integrating the multi-message-based approaches to ZKP-capable attestations, into the EUDI Wallet. The solution ensures that Users SHALL be protected both from collusion between Relying Parties and from scenarios where Relying Parties collude with Attestation Providers.

Work plan

• The EC is working and developing a technical specification that will cover this topic.
• ETSI will produce a technical specification based on the technical specification produced by the EC as ETSI TS 119 476-2.

Updates

• 2026-02-20: Target date was updated to 2026-03-31.
• 2026-02-11: Draft v0.4 published, with editorial update (licensing and reuse clarification)
• 2026-02-04: A new draft of TS14 was published on GitHub by the EC, incorporating updates based on the comments from the second Focus meeting.
• 2025-11-19: ETSI informed that they intend to develop TS14 as ETSI TS 119 476-2.

Alerts

There are no open alerts.

References

1. ARF Discussion area - Topic G
2. ARF TS4
3. ARF TS13
4. ARF TS14