Integrated Service Digital Network (ISDN) - Signalling System No. 7 (SS7); ISDN User part (ISUP) version 4 for the international interface - Part 21: Anonymous Call rejection (ACR) supplementary service (ITU-T Recommendation Q.731, clause 4 (1993)) (Endorsement of the English version EN 300356-21 V 4.2.1 (2001-07) as German standard)
Edition 2002-01

Services and Protocols for Advanced Networks (SPAN) - Anonymous Call Rejection (ACR) supplementary service - Service description (Endorsement of the English version EN 301798 V 1.1.1 (2000-10) as German Standard)
Edition 2001-10

Information technology - Security techniques - Anonymous digital signatures - Part 1: General
Edition 2013-12

Information technology - Security techniques - Anonymous digital signatures - Part 2: Mechanisms using a group public key
Edition 2013-11

Information technology - Security techniques - Anonymous digital signatures - Part 2: Mechanisms using a group public key; Amendment 1
Edition 2021-02

Information technology - Security techniques - Anonymous digital signatures - Part 2: Mechanisms using a group public key; Amendment 2
Edition 2023-04

Information technology - Security techniques - Anonymous digital signatures - Part 3: Mechanisms using multiple public keys
Edition 2023-10

Information technology - Security techniques - Anonymous entity authentication - Part 1: General
Edition 2013-08

Information technology - Security techniques - Anonymous entity authentication - Part 2: Mechanisms based on signatures using a group public key
Edition 2013-12

Information security - Anonymous entity authentication - Part 3: Mechanisms based on blind signatures
Edition 2022-02