ISO/IEC 20008-3:2024

Information security — Anonymous digital signatures — Part 3: Mechanisms using multiple public keys

This document specifies anonymous digital signature mechanisms in which a verifier uses multiple public keys to verify a digital signature. This document provides: — a general description of an anonymous digital signature mechanism using multiple public keys; — a variety of mechanisms that provide such anonymous digital signatures. For each mechanism, this document specifies the process for: — generating the private key and public key of each user; — producing signatures; — verifying signatures; — linking signatures (if the mechanism supports linking); — tracing signatures (if the mechanism supports tracing); — producing signatures with threshold capability (if the mechanism supports a threshold capability); — verifying signatures with threshold capability (if the mechanism supports a threshold capability). This document does not define the implementation of a public key infrastructure (PKI) and the means for distinct entities to exchange, extract and verify their respective public key certificates.

Sécurité de l’information — Signatures numériques anonymes — Partie 3: Mécanismes utilisant plusieurs clés publiques

General Information

• Status: Published
• Publication Date: 02-Dec-2024
• ICS: 35.030 - IT Security
• Technical Committee: ISO/IEC JTC 1/SC 27 - Information security, cybersecurity and privacy protection
• Drafting Committee: ISO/IEC JTC 1/SC 27/WG 2 - Cryptography and security mechanisms
• Current Stage: 6060 - International Standard published
• Start Date: 03-Dec-2024
• Due Date: 03-Dec-2024
• Completion Date: 03-Dec-2024

Standards Content (Sample)

International
Standard
ISO/IEC 20008-3
First edition
Information security — Anonymous
2024-12
digital signatures —
Part 3:
Mechanisms using multiple
public keys
Sécurité de l’information — Signatures numériques anonymes —
Partie 3: Mécanismes utilisant plusieurs clés publiques
Reference number
© ISO/IEC 2024
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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© ISO/IEC 2024 – All rights reserved
ii
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Symbols and abbreviated terms. 2
5 General model and requirements . . 3
5.1 General .3
5.2 Model .3
5.3 Requirements .4
6 Mechanisms without special capability . 4
6.1 General .4
6.2 Mechanism 1 .5
6.2.1 Symbols.5
6.2.2 Key generation process .5
6.2.3 Ring signature process .5
6.2.4 Ring signature verification process .6
6.3 Mechanism 2 .6
6.3.1 Symbols.6
6.3.2 Key generation process .7
6.3.3 Ring signature process .7
6.3.4 Ring signature verification process .7
6.4 Mechanism 3 .8
6.4.1 Symbols.8
6.4.2 Key generation process .8
6.4.3 Ring signature process .8
6.4.4 Ring signature verification process .8
7 Mechanisms with linking capability . 9
7.1 General .9
7.2 Mechanism 1 .9
7.2.1 Symbols.9
7.2.2 Key generation process .10
7.2.3 Ring signature process .10
7.2.4 Ring signature verification process .10
7.2.5 Ring signature linking process .11
7.2.6 Event-linkable type .11
8 Mechanisms with tracing capability .11
8.1 General .11
8.2 Mechanism 1 .11
8.2.1 Symbols.11
8.2.2 Key generation process .11
8.2.3 Ring signature process . 12
8.2.4 Ring signature verification process . 12
8.2.5 Ring signature tracing process . 13
9 Mechanisms with threshold capability .13
9.1 General . 13
9.2 Mechanism 1 . 13
9.2.1 Symbols. 13
9.2.2 Key generation process . 13
9.2.3 Ring signature process . 13
9.2.4 Ring signature verification process .14

© ISO/IEC 2024 – All rights reserved
iii
9.3 Mechanism 2 .14
9.3.1 Symbols.14
9.3.2 Key generation process .14
9.3.3 Ring signature process . 15
9.3.4 Ring signature verification process . 15
Annex A (normative) Object identifiers .16
Annex B (normative) Conversion functions . 17
Annex C (informative) Numerical examples of mechanisms in this document .18
Bibliography .23

© ISO/IEC 2024 – All rights reserved
iv
Foreword
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical
Commission) form the specialized system for worldwide standardization. National bodies that are
members of ISO or IEC participate in the development of International Standards through technical
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The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types
of document should be noted. This document was drafted in accordance with the editorial rules of the ISO/
IEC Directives, Part 2 (see www.iso.org/directives or www.iec.ch/members_experts/refdocs).
ISO and IEC draw attention to the possibility that the implementation of this document may involve the
use of (a) patent(s). ISO and IEC take no position concerning the evidence, validity or applicability of any
claimed patent rights in respect thereof. As of the date of publication of this document, ISO and IEC had not
received notice of (a) patent(s) which may be required to impl
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