ISO/IEC INTERNATIONAL STANDARD 20008-2 First edition 2013-11-15 Information technology Security techniques Anonymous digital signatures - Part 2: Mechanisms using a group public key Technologies de I'information - Techniques de sécurité - Signatures numeriquesanonymes Partie 2: Mécanismes utilisant une cle publique de groupe Reference number IS0/IEC 20008-2:2013(E) @IS0/IEC2013 I without license from IHS Not for Resale IS0/IEC 20008-2:2013(E) COPYRIGHTPROTECTEDDOCUMENT @IS0/IEC2013 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form written permission. Permission can be requested from either ISO at the address below or ISO's member body in the country of the requester. ISOcopyrightoffice Case postale 56:CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax +4122 749 09 47 E-mail copyright@iso.org Web www.iso.org Published in Switzerland @ IS0/IEC 2013 - All rights reserved Noreproduction or networking permited without license from IHS Not for Resale IS0/IEC 20008-2:2013(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. ..1 2 Normative references ..1 3 Terms and definitions 4 Symbols (and abbreviated terms) ..2 5 General model and requirements. ..3 6 Mechanisms with linking capability ..4 6.1 General ..4 6.2 Mechanism 1 ..4 6.3 Mechanism 2. .10 6.4 Mechanism 3 15 6.5 Mechanism4 20 7 Mechanisms with opening capability .23 7.1 General 23 7.2 Mechanism5 .23 7.3 Mechanism6 26 8 Mechanisms with both opening and linking capabilities .29 8.1 General 29 8.2 Mechanism7 29 Annex A (normative) Object identifiers ..35 Annex B (normative) Special hash-functions ..37 Annex C (informative) Security guidelines for the anonymous signature mechanisms ..39 Annex D (informative) Comparison of revocation mechanisms .42 Annex E (informative) Numerical examples .45 Annex F (informative) Proof of correct generation in Mechanism 5 ..81 Bibliography .85 ation- All rights reserved iii se with IS lout license from IHS Not for Resale